Opened 11 months ago

Closed 11 months ago

Last modified 11 months ago

#7328 closed defect (invalid)

Bug: FFmpeg's tee muxer treats a named pipe output as a regular output file instead of 'writing' into it as expected.

Reported by: Brainiarc7 Owned by:
Priority: normal Component: undetermined
Version: git-master Keywords:
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

Summary of the bug:

As described above, FFmpeg treats a named pipe output as any other file when using the tee muxer, and instead of writing into it as expected, merely ignores it and creates a new file named after the named pipe syntax. See the snippet below:

How to reproduce:

ffmpeg -re -stream_loop -1 -threads 2 -loglevel debug -filter_complex_threads 2 \
-i '/home/brainiarc7/Desktop/src/mercyme.MKV' \
-filter_complex "[0:v]split=2[s0][s1]; \
[s0]yadif[v0]; \
[s1]yadif[v1]" \
-b:v:0 2250k -c:v h264_nvenc -a53cc 1 -profile:v high -aud 1 \
-b:v:1 1750k -c:v h264_nvenc -a53cc 1 -profile:v high -aud 1 \
-c:a aac -b:a 128k -ar 48000 -ac 2 \
-flags -global_header \
-map "[v0]" -map "[v1]" -map 0:a:0 \
-f tee -use_fifo 1 "[f=hls:hls_flags=+delete_segments:hls_time=2:hls_list_size=5:var_stream_map="'v\\\:0,a\\\:0 v\\\:1,a\\\:0'":master_pl_name=master.m3u8]"/home/brainiarc7/Desktop/dest/vs%v/manifest.m3u8"| \
 [f=mp4:movflags=frag_keyframe+empty_moov] pipe:1 > test_channel.mp4"

Output:

ffmpeg version N-91482-g8aa6d9a8d3 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  configuration: --prefix=/home/brainiarc7/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/brainiarc7/ffmpeg_build/include --extra-ldflags=-L/home/brainiarc7/ffmpeg_build/lib --bindir=/home/brainiarc7/bin --enable-cuda-sdk --enable-cuvid --enable-libnpp --extra-cflags=-I/usr/local/cuda/include/ --extra-ldflags=-L/usr/local/cuda/lib64/ --nvccflags='-gencode arch=compute_61,code=sm_61 -O2' --enable-gpl --enable-libass --enable-libfdk-aac --enable-libx264 --extra-libs=-lpthread --enable-libx265 --enable-nvenc --enable-nonfree
  libavutil      56. 18.102 / 56. 18.102
  libavcodec     58. 21.105 / 58. 21.105
  libavformat    58. 17.101 / 58. 17.101
  libavdevice    58.  4.101 / 58.  4.101
  libavfilter     7. 26.100 /  7. 26.100
  libswscale      5.  2.100 /  5.  2.100
  libswresample   3.  2.100 /  3.  2.100
  libpostproc    55.  2.100 / 55.  2.100
Splitting the commandline.
Reading option '-re' ... matched as option 're' (read input at native frame rate) with argument '1'.
Reading option '-stream_loop' ... matched as option 'stream_loop' (set number of times input stream shall be looped) with argument '-1'.
Reading option '-threads' ... matched as AVOption 'threads' with argument '2'.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
Reading option '-filter_complex_threads' ... matched as option 'filter_complex_threads' (number of threads for -filter_complex) with argument '2'.
Reading option '-i' ... matched as input url with argument '/home/brainiarc7/Desktop/src/mercyme.MKV'.
Reading option '-filter_complex' ... matched as option 'filter_complex' (create a complex filtergraph) with argument '[0:v]split=2[s0][s1]; [s0]yadif[v0]; [s1]yadif[v1]'.
Reading option '-b:v:0' ... matched as option 'b' (video bitrate (please use -b:v)) with argument '2250k'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'h264_nvenc'.
Reading option '-a53cc' ... matched as AVOption 'a53cc' with argument '1'.
Reading option '-profile:v' ... matched as option 'profile' (set profile) with argument 'high'.
Reading option '-aud' ... matched as AVOption 'aud' with argument '1'.
Reading option '-b:v:1' ... matched as option 'b' (video bitrate (please use -b:v)) with argument '1750k'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'h264_nvenc'.
Reading option '-a53cc' ... matched as AVOption 'a53cc' with argument '1'.
Reading option '-profile:v' ... matched as option 'profile' (set profile) with argument 'high'.
Reading option '-aud' ... matched as AVOption 'aud' with argument '1'.
Reading option '-c:a' ... matched as option 'c' (codec name) with argument 'aac'.
Reading option '-b:a' ... matched as option 'b' (video bitrate (please use -b:v)) with argument '128k'.
Reading option '-ar' ... matched as option 'ar' (set audio sampling rate (in Hz)) with argument '48000'.
Reading option '-ac' ... matched as option 'ac' (set number of audio channels) with argument '2'.
Reading option '-flags' ... matched as AVOption 'flags' with argument '-global_header'.
Reading option '-map' ... matched as option 'map' (set input stream mapping) with argument '[v0]'.
Reading option '-map' ... matched as option 'map' (set input stream mapping) with argument '[v1]'.
Reading option '-map' ... matched as option 'map' (set input stream mapping) with argument '0:a:0'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'tee'.
Reading option '-use_fifo' ... matched as AVOption 'use_fifo' with argument '1'.
Reading option '[f=hls:hls_flags=+delete_segments:hls_time=2:hls_list_size=5:var_stream_map=v\\\:0,a\\\:0 v\\\:1,a\\\:0:master_pl_name=master.m3u8]/home/brainiarc7/Desktop/dest/vs%v/manifest.m3u8|  [f=mp4:movflags=frag_keyframe+empty_moov] pipe:1 > test_channel.mp4' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option loglevel (set logging level) with argument debug.
Applying option filter_complex_threads (number of threads for -filter_complex) with argument 2.
Applying option filter_complex (create a complex filtergraph) with argument [0:v]split=2[s0][s1]; [s0]yadif[v0]; [s1]yadif[v1].
Successfully parsed a group of options.
Parsing a group of options: input url /home/brainiarc7/Desktop/src/mercyme.MKV.
Applying option re (read input at native frame rate) with argument 1.
Applying option stream_loop (set number of times input stream shall be looped) with argument -1.
Successfully parsed a group of options.
Opening an input file: /home/brainiarc7/Desktop/src/mercyme.MKV.
[NULL @ 0x562aa3ec3600] Opening '/home/brainiarc7/Desktop/src/mercyme.MKV' for reading
[file @ 0x562aa3ec4180] Setting default whitelist 'file,crypto'
[matroska,webm @ 0x562aa3ec3600] Format matroska,webm probed with size=2048 and score=100
[matroska,webm @ 0x562aa3ec3600] Unknown entry 0x73C5
    Last message repeated 1 times
st:0 removing common factor 1000000 from timebase
st:1 removing common factor 1000000 from timebase
[matroska,webm @ 0x562aa3ec3600] Before avformat_find_stream_info() pos: 752 bytes read:32768 seeks:0 nb_streams:2
[vp9 @ 0x562aa3ec75c0] Format yuv420p chosen by get_format().
[matroska,webm @ 0x562aa3ec3600] All info found
[matroska,webm @ 0x562aa3ec3600] rfps: 23.750000 0.011872
    Last message repeated 1 times
[matroska,webm @ 0x562aa3ec3600] rfps: 23.833333 0.004757
[matroska,webm @ 0x562aa3ec3600] rfps: 23.916667 0.000861
[matroska,webm @ 0x562aa3ec3600] rfps: 24.000000 0.000184
[matroska,webm @ 0x562aa3ec3600] rfps: 24.083333 0.002727
[matroska,webm @ 0x562aa3ec3600] rfps: 24.166667 0.008490
    Last message repeated 1 times
[matroska,webm @ 0x562aa3ec3600] rfps: 24.250000 0.017472
    Last message repeated 1 times
[matroska,webm @ 0x562aa3ec3600] rfps: 48.000000 0.000737
[matroska,webm @ 0x562aa3ec3600] rfps: 120.000000 0.004604
[matroska,webm @ 0x562aa3ec3600] rfps: 240.000000 0.018416
[matroska,webm @ 0x562aa3ec3600] rfps: 23.976024 0.000049
[matroska,webm @ 0x562aa3ec3600] rfps: 47.952048 0.000196
[matroska,webm @ 0x562aa3ec3600] Setting avg frame rate based on r frame rate
[matroska,webm @ 0x562aa3ec3600] After avformat_find_stream_info() pos: 19216 bytes read:32768 seeks:0 frames:125
Input #0, matroska,webm, from '/home/brainiarc7/Desktop/src/mercyme.MKV':
  Metadata:
    COMPATIBLE_BRANDS: isomiso2avc1mp41
    MAJOR_BRAND     : isom
    MINOR_VERSION   : 512
    ENCODER         : IDMmkvlib0.1
    LANGUAGE        : und
    HANDLER_NAME    : AudioHandler
  Duration: 00:04:46.22, start: 0.000000, bitrate: 997 kb/s
    Stream #0:0, 41, 1/1000: Video: vp9 (Profile 0), 1 reference frame, yuv420p(tv, bt709/unknown/unknown), 1920x1080, 0/1, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn, 1k tbc (default)
    Stream #0:1, 84, 1/1000: Audio: opus, 48000 Hz, stereo, fltp (default)
Successfully opened the file.
[Parsed_split_0 @ 0x562aa3f34540] Setting 'outputs' to value '2'
Parsing a group of options: output url [f=hls:hls_flags=+delete_segments:hls_time=2:hls_list_size=5:var_stream_map=v\\\:0,a\\\:0 v\\\:1,a\\\:0:master_pl_name=master.m3u8]/home/brainiarc7/Desktop/dest/vs%v/manifest.m3u8|  [f=mp4:movflags=frag_keyframe+empty_moov] pipe:1 > test_channel.mp4.
Applying option b:v:0 (video bitrate (please use -b:v)) with argument 2250k.
Applying option c:v (codec name) with argument h264_nvenc.
Applying option profile:v (set profile) with argument high.
Applying option b:v:1 (video bitrate (please use -b:v)) with argument 1750k.
Applying option c:v (codec name) with argument h264_nvenc.
Applying option profile:v (set profile) with argument high.
Applying option c:a (codec name) with argument aac.
Applying option b:a (video bitrate (please use -b:v)) with argument 128k.
Applying option ar (set audio sampling rate (in Hz)) with argument 48000.
Applying option ac (set number of audio channels) with argument 2.
Applying option map (set input stream mapping) with argument [v0].
Applying option map (set input stream mapping) with argument [v1].
Applying option map (set input stream mapping) with argument 0:a:0.
Applying option f (force format) with argument tee.
Successfully parsed a group of options.
Opening an output file: [f=hls:hls_flags=+delete_segments:hls_time=2:hls_list_size=5:var_stream_map=v\\\:0,a\\\:0 v\\\:1,a\\\:0:master_pl_name=master.m3u8]/home/brainiarc7/Desktop/dest/vs%v/manifest.m3u8|  [f=mp4:movflags=frag_keyframe+empty_moov] pipe:1 > test_channel.mp4.
Codec AVOption a53cc (Use A53 Closed Captions (if available)) specified for output file #0 ([f=hls:hls_flags=+delete_segments:hls_time=2:hls_list_size=5:var_stream_map=v\\\:0,a\\\:0 v\\\:1,a\\\:0:master_pl_name=master.m3u8]/home/brainiarc7/Desktop/dest/vs%v/manifest.m3u8|  [f=mp4:movflags=frag_keyframe+empty_moov] pipe:1 > test_channel.mp4) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
Successfully opened the file.
Stream mapping:
  Stream #0:0 (vp9) -> split (graph 0)
  yadif (graph 0) -> Stream #0:0 (h264_nvenc)
  yadif (graph 0) -> Stream #0:1 (h264_nvenc)
  Stream #0:1 -> #0:2 (opus (native) -> aac (native))
Press [q] to stop, [?] for help
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
    Last message repeated 1 times
[vp9 @ 0x562aa3f50c80] Format yuv420p chosen by get_format().
detected 12 logical cores
[graph_1_in_0_1 @ 0x562aa400d080] Setting 'time_base' to value '1/48000'
[graph_1_in_0_1 @ 0x562aa400d080] Setting 'sample_rate' to value '48000'
[graph_1_in_0_1 @ 0x562aa400d080] Setting 'sample_fmt' to value 'fltp'
[graph_1_in_0_1 @ 0x562aa400d080] Setting 'channel_layout' to value '0x3'
[graph_1_in_0_1 @ 0x562aa400d080] tb:1/48000 samplefmt:fltp samplerate:48000 chlayout:0x3
[format_out_0_2 @ 0x562aa400d540] Setting 'sample_fmts' to value 'fltp'
[format_out_0_2 @ 0x562aa400d540] Setting 'sample_rates' to value '48000'
[format_out_0_2 @ 0x562aa400d540] Setting 'channel_layouts' to value '0x3'
[AVFilterGraph @ 0x562aa3f09f40] query_formats: 4 queried, 9 merged, 0 already done, 0 delayed
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
    Last message repeated 9234 times
[Parsed_split_0 @ 0x562aa40b4380] Setting 'outputs' to value '2'
[graph 0 input from stream 0:0 @ 0x562aa40b6380] Setting 'video_size' to value '1920x1080'
[graph 0 input from stream 0:0 @ 0x562aa40b6380] Setting 'pix_fmt' to value '0'
[graph 0 input from stream 0:0 @ 0x562aa40b6380] Setting 'time_base' to value '1/1000'
[graph 0 input from stream 0:0 @ 0x562aa40b6380] Setting 'pixel_aspect' to value '1/1'
[graph 0 input from stream 0:0 @ 0x562aa40b6380] Setting 'sws_param' to value 'flags=2'
[graph 0 input from stream 0:0 @ 0x562aa40b6380] Setting 'frame_rate' to value '24000/1001'
[graph 0 input from stream 0:0 @ 0x562aa40b6380] w:1920 h:1080 pixfmt:yuv420p tb:1/1000 fr:24000/1001 sar:1/1 sws_param:flags=2
[format @ 0x562aa4010180] Setting 'pix_fmts' to value 'yuv420p|nv12|p010le|yuv444p|p016le|yuv444p16le|bgr0|rgb0|cuda'
[format @ 0x562aa40b6f00] Setting 'pix_fmts' to value 'yuv420p|nv12|p010le|yuv444p|p016le|yuv444p16le|bgr0|rgb0|cuda'
[AVFilterGraph @ 0x562aa40b3b40] query_formats: 8 queried, 7 merged, 0 already done, 0 delayed
[h264_nvenc @ 0x562aa3f02600] Loaded lib: libcuda.so.1
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuInit
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuDeviceGetCount
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuDeviceGet
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuDeviceGetName
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuDeviceComputeCapability
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuCtxCreate_v2
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuCtxSetLimit
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuCtxPushCurrent_v2
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuCtxPopCurrent_v2
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuCtxDestroy_v2
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuMemAlloc_v2
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuMemFree_v2
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuMemcpy2D_v2
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuMemcpy2DAsync_v2
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuGetErrorName
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuGetErrorString
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuStreamCreate
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuStreamQuery
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuStreamSynchronize
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuStreamDestroy_v2
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuStreamAddCallback
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuEventCreate
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuEventDestroy_v2
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuEventSynchronize
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuEventQuery
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuEventRecord
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuGLGetDevices_v2
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuGraphicsGLRegisterImage
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuGraphicsUnregisterResource
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuGraphicsMapResources
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuGraphicsUnmapResources
[h264_nvenc @ 0x562aa3f02600] Loaded sym: cuGraphicsSubResourceGetMappedArray
[h264_nvenc @ 0x562aa3f02600] Loaded lib: libnvidia-encode.so.1
[h264_nvenc @ 0x562aa3f02600] Loaded sym: NvEncodeAPICreateInstance
[h264_nvenc @ 0x562aa3f02600] Loaded sym: NvEncodeAPIGetMaxSupportedVersion
[h264_nvenc @ 0x562aa3f02600] Loaded Nvenc version 8.1
[h264_nvenc @ 0x562aa3f02600] Nvenc initialized successfully
[h264_nvenc @ 0x562aa3f02600] 1 CUDA capable devices found
[h264_nvenc @ 0x562aa3f02600] [ GPU #0 - < GeForce GTX 1070 with Max-Q Design > has Compute SM 6.1 ]
[h264_nvenc @ 0x562aa3f02600] supports NVENC
[h264_nvenc @ 0x562aa3f036c0] Loaded lib: libcuda.so.1
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuInit
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuDeviceGetCount
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuDeviceGet
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuDeviceGetName
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuDeviceComputeCapability
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuCtxCreate_v2
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuCtxSetLimit
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuCtxPushCurrent_v2
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuCtxPopCurrent_v2
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuCtxDestroy_v2
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuMemAlloc_v2
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuMemFree_v2
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuMemcpy2D_v2
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuMemcpy2DAsync_v2
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuGetErrorName
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuGetErrorString
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuStreamCreate
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuStreamQuery
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuStreamSynchronize
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuStreamDestroy_v2
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuStreamAddCallback
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuEventCreate
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuEventDestroy_v2
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuEventSynchronize
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuEventQuery
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuEventRecord
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuGLGetDevices_v2
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuGraphicsGLRegisterImage
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuGraphicsUnregisterResource
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuGraphicsMapResources
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuGraphicsUnmapResources
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: cuGraphicsSubResourceGetMappedArray
[h264_nvenc @ 0x562aa3f036c0] Loaded lib: libnvidia-encode.so.1
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: NvEncodeAPICreateInstance
[h264_nvenc @ 0x562aa3f036c0] Loaded sym: NvEncodeAPIGetMaxSupportedVersion
[h264_nvenc @ 0x562aa3f036c0] Loaded Nvenc version 8.1
[h264_nvenc @ 0x562aa3f036c0] Nvenc initialized successfully
[h264_nvenc @ 0x562aa3f036c0] 1 CUDA capable devices found
[h264_nvenc @ 0x562aa3f036c0] [ GPU #0 - < GeForce GTX 1070 with Max-Q Design > has Compute SM 6.1 ]
[h264_nvenc @ 0x562aa3f036c0] supports NVENC
[tee @ 0x562aa3ed9100] filename:'/home/brainiarc7/Desktop/dest/vs%v/manifest.m3u8' format:fifo
[tee @ 0x562aa3ed9100]     stream:0 codec:h264 type:video bsfs: null
[tee @ 0x562aa3ed9100]     stream:1 codec:h264 type:video bsfs: null
[tee @ 0x562aa3ed9100]     stream:2 codec:aac type:audio bsfs: null
[hls @ 0x562aa520f7c0] Number of variant streams 2
[tee @ 0x562aa3ed9100] filename:' pipe:1 > test_channel.mp4' format:fifo
[tee @ 0x562aa3ed9100]     stream:0 codec:h264 type:video bsfs: null
[tee @ 0x562aa3ed9100]     stream:1 codec:h264 type:video bsfs: null
[tee @ 0x562aa3ed9100]     stream:2 codec:aac type:audio bsfs: null
Output #0, tee, to '[f=hls:hls_flags=+delete_segments:hls_time=2:hls_list_size=5:var_stream_map=v\\\:0,a\\\:0 v\\\:1,a\\\:0:master_pl_name=master.m3u8]/home/brainiarc7/Desktop/dest/vs%v/manifest.m3u8|  [f=mp4:movflags=frag_keyframe+empty_moov] pipe:1 > test_channel.mp4':
  Metadata:
    COMPATIBLE_BRANDS: isomiso2avc1mp41
    MAJOR_BRAND     : isom
    MINOR_VERSION   : 512
    HANDLER_NAME    : AudioHandler
    LANGUAGE        : und
    encoder         : Lavf58.17.101
[mp4 @ 0x562aa5219a80] Opening ' pipe:1 > test_channel.mp4' for writing
    Stream #0:0, 0, 1001/24000Setting default whitelist 'file,crypto'
: Video: h264 (h264_nvenc) (High), 1 reference frame, yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 0/1, q=-1--1, 2250 kb/s, 23.98 fps, 23.98 tbn, Opening '/home/brainiarc7/Desktop/dest/vs0/manifest0.ts' for writing
23.98 tbc (default)
    Metadata:
      encoder         : Lavc58.21.105 h264_nvenc
    Side data:
      cpb: bitrate max/min/avg: 0/0/2250000 buffer size: 4500000 vbv_delay: -1
[mp4 @ 0x562aa5219a80] Empty MOOV enabled; disabling automatic bitstream filtering
[file @ 0x7f078c005800] Setting default whitelist 'file,crypto'
    Stream #0:1, 0, 1001/24000: Video: h264 (h264_nvenc) (High), 1 reference frame, yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 0/1, q=-1--1, 1750 kb/s, 23.98 fps, 23.98 tbn, 23.98 tbc (default)
    Metadata:
      encoder         : Lavc58.21.105 h264_nvenc
    Side data:
      cpb: bitrate max/min/avg: 0/0/1750000 buffer size: 3500000 vbv_delay: -1
    Stream #0:2, 0, 1/48000: Audio: aac (LC), 48000 Hz, stereo, fltp, delay 1024, 128 kb/s (default)
    Metadata:
      encoder         : Lavc58.21.105 aac
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
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[hls @ 0x562aa520f7c0] Opening '/home/brainiarc7/Desktop/dest/vs1/manifest0.ts' for writing
[file @ 0x7f078c048c80] Setting default whitelist 'file,crypto'
[mpegts @ 0x7f078c002a00] muxrate VBR, pcr every 2 pkts, sdt every 2147483647, pat/pmt every 2147483647 pkts
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
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[mpegts @ 0x7f078c046080] muxrate VBR, pcr every 2 pkts, sdt every 2147483647, pat/pmt every 2147483647 pkts
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
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[AVIOContext @ 0x7f078c045c00] Statistics: 0 seeks, 14 writeoutsate=N/A speed=0.992x   
[hls @ 0x562aa520f7c0] Opening '/home/brainiarc7/Desktop/dest/vs0/manifest1.ts' for writing
[file @ 0x7f078c08f980] Setting default whitelist 'file,crypto'
[hls @ 0x562aa520f7c0] Opening '/home/brainiarc7/Desktop/dest/vs0/manifest.m3u8.tmp' for writing
[file @ 0x7f078c08fa40] Setting default whitelist 'file,crypto'
EXT-X-MEDIA-SEQUENCE:0
[AVIOContext @ 0x7f078c006800] Statistics: 0 seeks, 1 writeouts
[AVIOContext @ 0x7f078c088f40] Statistics: 0 seeks, 10 writeouts
[hls @ 0x562aa520f7c0] Opening '/home/brainiarc7/Desktop/dest/vs1/manifest1.ts' for writing
[file @ 0x7f078c08fa40] Setting default whitelist 'file,crypto'
[hls @ 0x562aa520f7c0] Opening '/home/brainiarc7/Desktop/dest/vs1/manifest.m3u8.tmp' for writing
[file @ 0x7f078c007dc0] Setting default whitelist 'file,crypto'
EXT-X-MEDIA-SEQUENCE:0
[AVIOContext @ 0x7f078c0076c0] Statistics: 0 seeks, 1 writeouts
[hls @ 0x562aa520f7c0] Opening '/home/brainiarc7/Desktop/dest/master.m3u8' for writing
[file @ 0x7f078c007840] Setting default whitelist 'file,crypto'
[AVIOContext @ 0x7f078c0076c0] Statistics: 0 seeks, 1 writeouts
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[AVIOContext @ 0x7f078c08f700] Statistics: 0 seeks, 10 writeouts
[hls @ 0x562aa520f7c0] Opening '/home/brainiarc7/Desktop/dest/vs0/manifest.m3u8.tmp' for writing
[file @ 0x7f078c08f6c0] Setting default whitelist 'file,crypto'
EXT-X-MEDIA-SEQUENCE:0
[AVIOContext @ 0x7f078c048d00] Statistics: 0 seeks, 1 writeouts
[AVIOContext @ 0x7f078c006800] Statistics: 0 seeks, 7 writeouts
[hls @ 0x562aa520f7c0] Opening '/home/brainiarc7/Desktop/dest/vs1/manifest.m3u8.tmp' for writing
[file @ 0x7f078c048c40] Setting default whitelist 'file,crypto'
EXT-X-MEDIA-SEQUENCE:0
[AVIOContext @ 0x7f078c090380] Statistics: 0 seeks, 1 writeouts
[AVIOContext @ 0x7f0784041280] Statistics: 0 seeks, 40 writeouts
frame=  436 fps= 24 q=20.0 Lq=23.0 size=N/A time=00:00:18.24 bitrate=N/A speed=0.998x   
video:9096kB audio:264kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Input file #0 (/home/brainiarc7/Desktop/src/mercyme.MKV):
  Input stream #0:0 (video): 438 packets read (1210811 bytes); 438 frames decoded;
  Input stream #0:1 (audio): 912 packets read (285142 bytes); 912 frames decoded (875520 samples);
  Total: 1350 packets (1495953 bytes) demuxed
Output file #0 ([f=hls:hls_flags=+delete_segments:hls_time=2:hls_list_size=5:var_stream_map=v\\\:0,a\\\:0 v\\\:1,a\\\:0:master_pl_name=master.m3u8]/home/brainiarc7/Desktop/dest/vs%v/manifest.m3u8|  [f=mp4:movflags=frag_keyframe+empty_moov] pipe:1 > test_channel.mp4):
  Output stream #0:0 (video): 436 frames encoded; 436 packets muxed (5341855 bytes);
  Output stream #0:1 (video): 436 frames encoded; 436 packets muxed (3972459 bytes);
  Output stream #0:2 (audio): 855 frames encoded (875520 samples); 856 packets muxed (270328 bytes);
  Total: 1728 packets (9584642 bytes) muxed
1350 frames successfully decoded, 0 decoding errors
[h264_nvenc @ 0x562aa3f02600] Nvenc unloaded
[h264_nvenc @ 0x562aa3f036c0] Nvenc unloaded
[aac @ 0x562aa3f4ebc0] Qavg: 5826.013
[AVIOContext @ 0x562aa3ecc640] Statistics: 1507328 bytes read, 0 seeks
Exiting normally, received signal 2.

What I expected:

FFmpeg should output to the named pipe test_stream.mp4.

What I get:

FFmpeg outputs to a filesystem object, named ' pipe:1 > test_channel.mp4'.

An example of a working command:

See the snippet below:

ffmpeg -re -stream_loop -1 -threads 5 -loglevel debug -filter_complex_threads 5 \
-init_hw_device qsv=qsv:MFX_IMPL_hw_any -hwaccel qsv -filter_hw_device qsv \
-i '/home/brainiarc7/Desktop/src/mercyme.MKV' \
-filter_complex "[0:v]split=6[s0][s1][s2][s3][s4][s5]; \
[s0]hwupload=extra_hw_frames=10,vpp_qsv=deinterlace=2,scale_qsv=1920:1080:format=nv12[v0]; \
[s1]hwupload=extra_hw_frames=10,vpp_qsv=deinterlace=2,scale_qsv=1280:720:format=nv12[v1];
[s2]hwupload=extra_hw_frames=10,vpp_qsv=deinterlace=2,scale_qsv=960:540:format=nv12[v2];
[s3]hwupload=extra_hw_frames=10,vpp_qsv=deinterlace=2,scale_qsv=842:480:format=nv12[v3];
[s4]hwupload=extra_hw_frames=10,vpp_qsv=deinterlace=2,scale_qsv=480:360:format=nv12[v4];
[s5]hwupload=extra_hw_frames=10,vpp_qsv=deinterlace=2,scale_qsv=426:240:format=nv12[v5]" \
-b:v:0 2250k -c:v h264_qsv -a53cc 1 -rdo 1 -pic_timing_sei 1 -recovery_point_sei 1 -profile high -aud 1 \
-b:v:1 1750k -c:v h264_qsv -a53cc 1 -rdo 1 -pic_timing_sei 1 -recovery_point_sei 1 -profile high -aud 1 \
-b:v:2 1000k -c:v h264_qsv -a53cc 1 -rdo 1 -pic_timing_sei 1 -recovery_point_sei 1 -profile high -aud 1 \
-b:v:3 875k -c:v h264_qsv -a53cc 1 -rdo 1 -pic_timing_sei 1 -recovery_point_sei 1 -profile high -aud 1 \
-b:v:4 750k -c:v h264_qsv -a53cc 1 -rdo 1 -pic_timing_sei 1 -recovery_point_sei 1 -profile high -aud 1 \
-b:v:5 640k -c:v h264_qsv -a53cc 1 -rdo 1 -pic_timing_sei 1 -recovery_point_sei 1 -profile high -aud 1 \
-c:a aac -b:a 128k -ar 48000 -ac 2 \
-flags -global_header \
-map "[v0]" -map "[v1]" -map "[v2]" -map "[v3]" -map "[v4]" -map "[v5]" -map 0:a:0 \
-f mp4 -movflags frag_keyframe+empty_moov pipe: > test_channel

That outputs the encoder's content into a named pipe on the filesystem, whereas attempting to do the same with the tee muxer results in failure.

Change History (5)

comment:1 Changed 11 months ago by Cigaes

  • Resolution set to invalid
  • Status changed from new to closed

The > syntax is handled by shells, and ffmpeg is not a shell, nor does it invoke one, and therefore it will never understand that syntax.

If you want to write into filesystem object test_channel.mp4, then use it as output, nothing else. The principle of named pipes is that they are not different from plain files for basic operations.

comment:2 Changed 11 months ago by cehoyos

  • Component changed from avformat to undetermined
  • Keywords tee muxer removed

comment:3 Changed 11 months ago by Brainiarc7

  • Component changed from undetermined to avformat
  • Keywords tee muxer added

And related,

When I remove the > from the command line, the same behavior as above is repeated.

Passing the full path of the named pipe as the input only results in the error:

[tee @ 0x560bb7272100] Slave muxer #1 failed, aborting.
av_interleaved_write_frame(): No such file or directory
No more output streams to write to, finishing.
[AVIOContext @ 0x7fb800045c00] Statistics: 0 seeks, 1 writeouts

Yet the file and path exists:

file /home/brainiarc7/test_channel
/home/brainiarc7/test_channel: fifo (named pipe)

For whatever reason, FFmpeg's tee muxer cannot recognize the named pipe as a valid output and instead of writing into it as expected, FFmeg simply creates a file on the filesystem with a name matching the output name :

' pipe: test_channel'

Is that intended behavior? And if so, why then does FFmpeg fail to treat it as a regular file that can be written to, as an output, when the tee muxer is called up?

comment:4 Changed 11 months ago by cehoyos

  • Component changed from avformat to undetermined
  • Keywords tee muxer removed

comment:5 Changed 11 months ago by Brainiarc7

My mistake, close this ticket and mark as invalid.

Specifying the output file name (for the fifo) directly fixes the issue.

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