failed with error info "partial file" when input a mp4 file via unix socket

[ku7iex2E]

Failed when via unix socket, but nothing wrong when you input it just as a normal file.
The mp4 file could be found in attatchment.
log of unix socket one:

% cat 1.mp4 | socat - unix-listen:/tmp/abcd &
% ffmpeg -report  -i unix:///tmp/abcd -c copy out.mkv

ffmpeg started on 2021-07-24 at 23:10:04
Report written to "ffmpeg-20210724-231004.log"
Log level: 48
Command line:
ffmpeg -report -i unix:///tmp/abcd -c copy out.mkv
ffmpeg version n4.4 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 11.1.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-shared --enable-version3
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Splitting the commandline.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Reading option '-i' ... matched as input url with argument 'unix:///tmp/abcd'.
Reading option '-c' ... matched as option 'c' (codec name) with argument 'copy'.
Reading option 'out.mkv' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option report (generate a report) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input url unix:///tmp/abcd.
Successfully parsed a group of options.
Opening an input file: unix:///tmp/abcd.
[NULL @ 0x55b6bf062440] Opening 'unix:///tmp/abcd' for reading
[unix @ 0x55b6bf0630c0] No default whitelist set
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] ISO: File Type Major Brand: dash
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] Unknown dref type 0x206c7275 size 12
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180002970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180004500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180006030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180007470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180009000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180010530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180011970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180013500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180015030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180016470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180018000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180019530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180020970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180022500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180024030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180025470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180027000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180028530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180029970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180031500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180033030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180034470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180036000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180037530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180038970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180040500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180042030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180043470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180045000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180046530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180047970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180049500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180051030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180052470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180054000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180055530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180056970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180058500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180060030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180061470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180063000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180064530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180065970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180067500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180069030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180070470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180072000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180073530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180074970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180076500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180078030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180079470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180081000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180082530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180083970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180085500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180087030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180088470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180090000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] found tfdt time 180091530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] Before avformat_find_stream_info() pos: 543003 bytes read:543003 seeks:0 nb_streams:1
[h264 @ 0x55b6bf064480] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x55b6bf064480] nal_unit_type: 8(PPS), nal_ref_idc: 3
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] stream 0, offset 0x885: partial file
[h264 @ 0x55b6bf064480] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x55b6bf064480] nal_unit_type: 8(PPS), nal_ref_idc: 3
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none, 1920x1080, 2 kb/s): unspecified pixel format
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] After avformat_find_stream_info() pos: 543003 bytes read:543003 seeks:0 frames:0
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'unix:///tmp/abcd':
  Metadata:
    major_brand     : dash
    minor_version   : 0
    compatible_brands: iso6avc1mp41
    creation_time   : 2021-07-23T10:29:14.000000Z
  Duration: 00:33:21.03, bitrate: N/A
  Stream #0:0(und), 0, 1/90000: Video: h264 (avc1 / 0x31637661), none, 1920x1080, 2 kb/s, 60 fps, 90k tbr, 90k tbn, 180k tbc (default)
    Metadata:
      creation_time   : 2021-07-23T10:29:14.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 07/23/2021.
      vendor_id       : [0][0][0][0]
Successfully opened the file.
Parsing a group of options: output url out.mkv.
Applying option c (codec name) with argument copy.
Successfully parsed a group of options.
Opening an output file: out.mkv.
[file @ 0x55b6bf06a380] Setting default whitelist 'file,crypto,data'
Successfully opened the file.
[matroska @ 0x55b6bf08fec0] get_metadata_duration returned: 0
Output #0, matroska, to 'out.mkv':
  Metadata:
    major_brand     : dash
    minor_version   : 0
    compatible_brands: iso6avc1mp41
    encoder         : Lavf58.76.100
  Stream #0:0(und), 0, 1/1000: Video: h264 (avc1 / 0x31637661), none, 1920x1080, q=2-31, 2 kb/s, 60 fps, 90k tbr, 1k tbn, 90k tbc (default)
    Metadata:
      creation_time   : 2021-07-23T10:29:14.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 07/23/2021.
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x55b6bf062440] stream 0, offset 0x3aa3c: partial file
unix:///tmp/abcd: Invalid data found when processing input
frame=    0 fps=0.0 q=-1.0 size=       1kB time=00:00:00.00 bitrate=N/A speed=N/A    
No more output streams to write to, finishing.
[matroska @ 0x55b6bf08fec0] end duration = 0
[matroska @ 0x55b6bf08fec0] stream 0 end duration = 0
frame=    0 fps=0.0 q=-1.0 Lsize=       1kB time=00:00:00.00 bitrate=N/A speed=   0x    
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Input file #0 (unix:///tmp/abcd):
  Input stream #0:0 (video): 0 packets read (0 bytes); 
  Total: 0 packets (0 bytes) demuxed
Output file #0 (out.mkv):
  Output stream #0:0 (video): 0 packets muxed (0 bytes); 
  Total: 0 packets (0 bytes) muxed
0 frames successfully decoded, 0 decoding errors
[AVIOContext @ 0x55b6bf06a5c0] Statistics: 0 seeks, 1 writeouts
[AVIOContext @ 0x55b6bf06b4c0] Statistics: 543003 bytes read, 0 seeks

as normal file:

% ffmpeg -report -i 1.mp4 -c copy out.mkv

ffmpeg started on 2021-07-24 at 23:18:12
Report written to "ffmpeg-20210724-231812.log"
Log level: 48
Command line:
ffmpeg -report -i 1.mp4 -c copy out.mkv
ffmpeg version n4.4 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 11.1.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-shared --enable-version3
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Splitting the commandline.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Reading option '-i' ... matched as input url with argument '1.mp4'.
Reading option '-c' ... matched as option 'c' (codec name) with argument 'copy'.
Reading option 'out.mkv' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option report (generate a report) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input url 1.mp4.
Successfully parsed a group of options.
Opening an input file: 1.mp4.
[NULL @ 0x562e0207f440] Opening '1.mp4' for reading
[file @ 0x562e020800c0] Setting default whitelist 'file,crypto,data'
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] ISO: File Type Major Brand: dash
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] Unknown dref type 0x206c7275 size 12
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180002970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180004500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180006030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180007470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180009000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180010530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180011970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180013500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180015030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180016470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180018000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180019530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180020970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180022500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180024030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180025470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180027000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180028530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180029970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180031500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180033030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180034470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180036000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180037530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180038970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180040500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180042030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180043470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180045000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180046530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180047970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180049500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180051030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180052470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180054000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180055530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180056970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180058500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180060030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180061470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180063000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180064530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180065970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180067500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180069030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180070470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180072000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180073530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180074970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180076500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180078030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180079470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180081000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180082530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180083970, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180085500, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180087030, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180088470, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180090000, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] found tfdt time 180091530, using it for dts
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] Before avformat_find_stream_info() pos: 538788 bytes read:335691 seeks:1 nb_streams:1
[h264 @ 0x562e02081440] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x562e02081440] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x562e02081440] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 0x562e02081440] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 0x562e02081440] nal_unit_type: 5(IDR), nal_ref_idc: 1
[h264 @ 0x562e02081440] Format yuv420p chosen by get_format().
[h264 @ 0x562e02081440] Reinit context to 1920x1088, pix_fmt: yuv420p
[h264 @ 0x562e02081440] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
[h264 @ 0x562e02081440] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
[h264 @ 0x562e02081440] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
[h264 @ 0x562e02081440] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
[h264 @ 0x562e02081440] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
[h264 @ 0x562e02081440] nal_unit_type: 1(Coded slice of a non-IDR picture), nal_ref_idc: 1
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] All info found
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] rfps: 59.000000 0.009372
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] rfps: 59.000000 0.009372
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] rfps: 60.000000 0.000259
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] rfps: 120.000000 0.001036
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] rfps: 240.000000 0.004144
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] rfps: 59.940060 0.000285
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] rfps: 59.940060 0.000285
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x562e0207f440] After avformat_find_stream_info() pos: 325855 bytes read:671894 seeks:2 frames:21
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mp4':
  Metadata:
    major_brand     : dash
    minor_version   : 0
    compatible_brands: iso6avc1mp41
    creation_time   : 2021-07-23T10:29:14.000000Z
  Duration: 00:33:21.03, start: 2000.033000, bitrate: 2 kb/s
  Stream #0:0(und), 21, 1/90000: Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 2 kb/s, 60 fps, 60 tbr, 90k tbn, 120 tbc (default)
    Metadata:
      creation_time   : 2021-07-23T10:29:14.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 07/23/2021.
      vendor_id       : [0][0][0][0]
Successfully opened the file.
Parsing a group of options: output url out.mkv.
Applying option c (codec name) with argument copy.
Successfully parsed a group of options.
Opening an output file: out.mkv.
[file @ 0x562e021a7b40] Setting default whitelist 'file,crypto,data'
Successfully opened the file.
[matroska @ 0x562e020a9140] get_metadata_duration returned: 0
Output #0, matroska, to 'out.mkv':
  Metadata:
    major_brand     : dash
    minor_version   : 0
    compatible_brands: iso6avc1mp41
    encoder         : Lavf58.76.100
  Stream #0:0(und), 0, 1/1000: Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 2 kb/s, 60 fps, 60 tbr, 1k tbn, 90k tbc (default)
    Metadata:
      creation_time   : 2021-07-23T10:29:14.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 07/23/2021.
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
[matroska @ 0x562e020a9140] Starting new cluster with timestamp 0 at offset 813 bytes
[matroska @ 0x562e020a9140] Writing block of size 237899 with pts 0, dts 0, duration 17 at relative offset 9 in cluster at offset 813. TrackNumber 1, keyframe 1
frame=    1 fps=0.0 q=-1.0 size=       1kB time=00:00:00.00 bitrate=6504.0kbits/s speed=N/A    
[matroska @ 0x562e020a9140] Writing block of size 3299 with pts 17, dts 17, duration 17 at relative offset 237916 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 3590 with pts 34, dts 34, duration 17 at relative offset 241222 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5085 with pts 50, dts 50, duration 17 at relative offset 244819 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5473 with pts 67, dts 67, duration 17 at relative offset 249911 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 450 with pts 84, dts 84, duration 17 at relative offset 255391 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5351 with pts 100, dts 100, duration 17 at relative offset 255848 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 2725 with pts 117, dts 117, duration 17 at relative offset 261206 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5392 with pts 134, dts 134, duration 17 at relative offset 263938 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 4868 with pts 150, dts 150, duration 17 at relative offset 269337 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 6532 with pts 167, dts 167, duration 17 at relative offset 274212 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5220 with pts 184, dts 184, duration 17 at relative offset 280751 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 4625 with pts 200, dts 200, duration 17 at relative offset 285978 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 6163 with pts 217, dts 217, duration 17 at relative offset 290610 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 4404 with pts 234, dts 234, duration 17 at relative offset 296780 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 2283 with pts 250, dts 250, duration 17 at relative offset 301191 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5051 with pts 267, dts 267, duration 17 at relative offset 303481 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 2612 with pts 284, dts 284, duration 17 at relative offset 308539 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 4273 with pts 300, dts 300, duration 17 at relative offset 311158 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5313 with pts 317, dts 317, duration 17 at relative offset 315438 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 906 with pts 334, dts 334, duration 17 at relative offset 320758 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5078 with pts 350, dts 350, duration 17 at relative offset 321671 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 6375 with pts 367, dts 367, duration 17 at relative offset 326756 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 4300 with pts 384, dts 384, duration 17 at relative offset 333138 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5380 with pts 400, dts 400, duration 17 at relative offset 337445 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5098 with pts 417, dts 417, duration 17 at relative offset 342832 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 6783 with pts 434, dts 434, duration 17 at relative offset 347937 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 10311 with pts 450, dts 450, duration 17 at relative offset 354727 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 8328 with pts 467, dts 467, duration 17 at relative offset 365045 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 6470 with pts 484, dts 484, duration 17 at relative offset 373380 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5430 with pts 500, dts 500, duration 17 at relative offset 379857 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5271 with pts 517, dts 517, duration 17 at relative offset 385294 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 4991 with pts 534, dts 534, duration 17 at relative offset 390572 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 6380 with pts 550, dts 550, duration 17 at relative offset 395570 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5495 with pts 567, dts 567, duration 17 at relative offset 401957 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 4340 with pts 584, dts 584, duration 17 at relative offset 407459 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5432 with pts 600, dts 600, duration 17 at relative offset 411806 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5549 with pts 617, dts 617, duration 17 at relative offset 417245 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 4001 with pts 634, dts 634, duration 17 at relative offset 422801 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 3842 with pts 650, dts 650, duration 17 at relative offset 426809 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 3661 with pts 667, dts 667, duration 17 at relative offset 430658 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5283 with pts 684, dts 684, duration 17 at relative offset 434326 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5755 with pts 700, dts 700, duration 17 at relative offset 439616 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5392 with pts 717, dts 717, duration 17 at relative offset 445378 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 3386 with pts 734, dts 734, duration 17 at relative offset 450777 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 6487 with pts 750, dts 750, duration 17 at relative offset 454170 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 6699 with pts 767, dts 767, duration 17 at relative offset 460664 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5304 with pts 784, dts 784, duration 17 at relative offset 467370 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 6309 with pts 800, dts 800, duration 17 at relative offset 472681 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 6159 with pts 817, dts 817, duration 17 at relative offset 478997 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 4314 with pts 834, dts 834, duration 17 at relative offset 485163 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 4979 with pts 850, dts 850, duration 17 at relative offset 489484 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5891 with pts 867, dts 867, duration 17 at relative offset 494470 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 4320 with pts 884, dts 884, duration 17 at relative offset 500368 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 6222 with pts 900, dts 900, duration 17 at relative offset 504695 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 3915 with pts 917, dts 917, duration 17 at relative offset 510924 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5739 with pts 934, dts 934, duration 17 at relative offset 514846 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 5626 with pts 950, dts 950, duration 17 at relative offset 520592 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 4426 with pts 967, dts 967, duration 17 at relative offset 526225 in cluster at offset 813. TrackNumber 1, keyframe 0
[matroska @ 0x562e020a9140] Writing block of size 4215 with pts 984, dts 984, duration 17 at relative offset 530658 in cluster at offset 813. TrackNumber 1, keyframe 0
No more output streams to write to, finishing.
[matroska @ 0x562e020a9140] end duration = 1001
[matroska @ 0x562e020a9140] stream 0 end duration = 1001
frame=   60 fps=0.0 q=-1.0 Lsize=     523kB time=00:00:00.98 bitrate=4351.1kbits/s speed= 437x    
video:522kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.239124%
Input file #0 (1.mp4):
  Input stream #0:0 (video): 60 packets read (534450 bytes); 
  Total: 60 packets (534450 bytes) demuxed
Output file #0 (out.mkv):
  Output stream #0:0 (video): 60 packets muxed (534450 bytes); 
  Total: 60 packets (534450 bytes) muxed
0 frames successfully decoded, 0 decoding errors
[AVIOContext @ 0x562e021aba40] Statistics: 2 seeks, 4 writeouts
[AVIOContext @ 0x562e02088480] Statistics: 876513 bytes read, 2 seeks