Opened 5 years ago

Last modified 8 months ago

#3406 open defect

H.264 threaded decode error

Reported by: Cigaes Owned by:
Priority: normal Component: avcodec
Version: git-master Keywords: h264
Cc: Blocked By:
Blocking: Reproduced by developer: yes
Analyzed by developer: no

Description

There are some samples that decode correctly with threads turned off or only a few threads, but fail to decode with mode threads.

For example:

$ ./ffmpeg_g -threads 4 -i /tmp/sf.h264 -f framecrc -c png -
ffmpeg version N-60805-gc8f3c3a Copyright (c) 2000-2014 the FFmpeg developers
  built on Feb 21 2014 20:26:22 with gcc 4.8 (Debian 4.8.2-15)
  configuration: --enable-shared --disable-static --enable-gpl --enable-libx264 --enable-libopus --enable-libass --enable-libfreetype --enable-opengl --assert-level=2
  libavutil      52. 65.100 / 52. 65.100
  libavcodec     55. 52.102 / 55. 52.102
  libavformat    55. 33.100 / 55. 33.100
  libavdevice    55. 10.100 / 55. 10.100
  libavfilter     4.  1.103 /  4.  1.103
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Input #0, h264, from '/tmp/sf.h264':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuv444p, 320x240 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 1200k tbn, 50 tbc
#software: Lavf55.33.100
#tb 0: 1/25
Output #0, framecrc, to 'pipe:':
  Metadata:
    encoder         : Lavf55.33.100
    Stream #0:0: Video: png, rgb24, 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> png)
Press [q] to stop, [?] for help
0,          0,          0,        1,    14600, 0x4d4b3314
0,          1,          1,        1,    20624, 0x9d04c3da
0,          2,          2,        1,    20373, 0x3224514e
0,          3,          3,        1,    16474, 0x5a53824a
0,          4,          4,        1,    20997, 0xe2ac63ec
0,          5,          5,        1,    21466, 0x3a5edae1
0,          6,          6,        1,    15290, 0x9fb36a83
0,          7,          7,        1,    19601, 0x8af6664a
0,          8,          8,        1,    20217, 0x96032e30
0,          9,          9,        1,    16655, 0x6e0a0985
0,         10,         10,        1,    18492, 0x12b572b4
0,         11,         11,        1,    18118, 0x6b1994d6
frame=   12 fps=0.0 q=0.0 Lsize=       1kB time=00:00:00.48 bitrate=  12.2kbits/s    
video:218kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead -99.671165%
$ ./ffmpeg_g -threads 5 -i /tmp/sf.h264 -f framecrc -c png -
ffmpeg version N-60805-gc8f3c3a Copyright (c) 2000-2014 the FFmpeg developers
  built on Feb 21 2014 20:26:22 with gcc 4.8 (Debian 4.8.2-15)
  configuration: --enable-shared --disable-static --enable-gpl --enable-libx264 --enable-libopus --enable-libass --enable-libfreetype --enable-opengl --assert-level=2
  libavutil      52. 65.100 / 52. 65.100
  libavcodec     55. 52.102 / 55. 52.102
  libavformat    55. 33.100 / 55. 33.100
  libavdevice    55. 10.100 / 55. 10.100
  libavfilter     4.  1.103 /  4.  1.103
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Input #0, h264, from '/tmp/sf.h264':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuv444p, 320x240 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 1200k tbn, 50 tbc
#software: Lavf55.33.100
#tb 0: 1/25
Output #0, framecrc, to 'pipe:':
  Metadata:
    encoder         : Lavf55.33.100
    Stream #0:0: Video: png, rgb24, 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> png)
Press [q] to stop, [?] for help
Error while decoding stream #0:0: Invalid data found when processing input
[h264 @ 0xa81240] reference picture missing during reorder
    Last message repeated 1 times
[h264 @ 0xa81240] Missing reference picture, default is 65548
    Last message repeated 1 times
[h264 @ 0xad9200] reference picture missing during reorder
[h264 @ 0xad9200] Missing reference picture, default is 65556
0,          0,          0,        1,    14600, 0x4d4b3314
0,          1,          1,        1,    20624, 0x9d04c3da
0,          3,          3,        1,    20373, 0x3224514e
0,          4,          4,        1,    16474, 0x5a53824a
0,          5,          5,        1,    21099, 0x61cb8a88
0,          6,          6,        1,    21466, 0x7d3727ad
0,          8,          8,        1,    15370, 0x4b0bcbbd
0,          9,          9,        1,    19775, 0xed275f1c
0,         10,         10,        1,    16851, 0x0725c06b
0,         11,         11,        1,    16717, 0xd445fc7c
frame=   10 fps=0.0 q=0.0 Lsize=       1kB time=00:00:00.48 bitrate=  10.3kbits/s    
video:179kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead -99.663483%

The -c png is necessary to reproduce the problem in this particular case, but threading issues are sensitive to timing. Helgrind spews a load of errors too:

==10123== Helgrind, a thread error detector
==10123== Copyright (C) 2007-2012, and GNU GPL'd, by OpenWorks LLP et al.
==10123== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info
==10123== Command: ./ffmpeg_g -threads 5 -i /tmp/sf.h264 -f framecrc -c png -
==10123== 
ffmpeg version N-60805-gc8f3c3a Copyright (c) 2000-2014 the FFmpeg developers
  built on Feb 21 2014 20:26:22 with gcc 4.8 (Debian 4.8.2-15)
  configuration: --enable-shared --disable-static --enable-gpl --enable-libx264 --enable-libopus --enable-libass --enable-libfreetype --enable-opengl --assert-level=2
  libavutil      52. 65.100 / 52. 65.100
  libavcodec     55. 52.102 / 55. 52.102
  libavformat    55. 33.100 / 55. 33.100
  libavdevice    55. 10.100 / 55. 10.100
  libavfilter     4.  1.103 /  4.  1.103
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Input #0, h264, from '/tmp/sf.h264':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuv444p, 320x240 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 1200k tbn, 50 tbc
#software: Lavf55.33.100
#tb 0: 1/25
Output #0, framecrc, to 'pipe:':
  Metadata:
    encoder         : Lavf55.33.100
    Stream #0:0: Video: png, rgb24, 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> png)
Press [q] to stop, [?] for help
==10123== ---Thread-Announcement------------------------------------------
==10123== 
==10123== Thread #11 was created
==10123==    at 0x7BC40BE: clone (clone.S:76)
==10123==    by 0x78C5FF4: do_clone.constprop.4 (createthread.c:74)
==10123==    by 0x78C7473: pthread_create@@GLIBC_2.2.5 (createthread.c:244)
==10123==    by 0x4C2D8F0: ??? (in /usr/lib/valgrind/vgpreload_helgrind-amd64-linux.so)
==10123==    by 0x58A417F: ff_frame_thread_encoder_init (frame_thread_encoder.c:204)
==10123==    by 0x5B7B5D1: avcodec_open2 (utils.c:1305)
==10123==    by 0x4210EA: transcode_init (ffmpeg.c:2658)
==10123==    by 0x406F8E: main (ffmpeg.c:3413)
==10123== 
==10123== ---Thread-Announcement------------------------------------------
==10123== 
==10123== Thread #1 is the program's root thread
==10123== 
==10123== ----------------------------------------------------------------
==10123== 
==10123== Lock at 0x103824B0 was first observed
==10123==    at 0x4C2E96A: pthread_mutex_init (in /usr/lib/valgrind/vgpreload_helgrind-amd64-linux.so)
==10123==    by 0x58A4082: ff_frame_thread_encoder_init (frame_thread_encoder.c:176)
==10123==    by 0x5B7B5D1: avcodec_open2 (utils.c:1305)
==10123==    by 0x4210EA: transcode_init (ffmpeg.c:2658)
==10123==    by 0x406F8E: main (ffmpeg.c:3413)
==10123== 
==10123== Possible data race during write of size 8 at 0x103814B8 by thread #11
==10123== Locks held: 1, at address 0x103824B0
==10123==    at 0x58A3E54: worker (frame_thread_encoder.c:105)
==10123==    by 0x4C2DA86: ??? (in /usr/lib/valgrind/vgpreload_helgrind-amd64-linux.so)
==10123==    by 0x78C6E0D: start_thread (pthread_create.c:311)
==10123==    by 0x7BC40FC: clone (clone.S:113)
==10123== 
==10123== This conflicts with a previous read of size 8 by thread #1
==10123== Locks held: none
==10123==    at 0x58A4487: ff_thread_video_encode_frame (frame_thread_encoder.c:275)
==10123==    by 0x41DCCB: reap_filters (ffmpeg.c:997)
==10123==    by 0x407BFD: main (ffmpeg.c:3399)
==10123== 
==10123== Address 0x103814B8 is 152 bytes inside a block of size 4856 alloc'd
==10123==    at 0x4C2BA30: memalign (in /usr/lib/valgrind/vgpreload_helgrind-amd64-linux.so)
==10123==    by 0x4C2BB57: posix_memalign (in /usr/lib/valgrind/vgpreload_helgrind-amd64-linux.so)
==10123==    by 0x6E4A7AC: av_malloc (mem.c:94)
==10123==    by 0x6E4A96D: av_mallocz (mem.c:244)
==10123==    by 0x58A403F: ff_frame_thread_encoder_init (frame_thread_encoder.c:165)
==10123==    by 0x5B7B5D1: avcodec_open2 (utils.c:1305)
==10123==    by 0x4210EA: transcode_init (ffmpeg.c:2658)
==10123==    by 0x406F8E: main (ffmpeg.c:3413)
==10123== 
0,          0,          0,        1,    14600, 0x4d4b3314
0,          1,          1,        1,    20624, 0x9d04c3da4 bitrate=  19.0kbits/s    
0,          2,          2,        1,    20373, 0x3224514e8 bitrate=  15.3kbits/s    
0,          3,          3,        1,    16474, 0x5a53824a2 bitrate=  14.1kbits/s    
0,          4,          4,        1,    20997, 0xe2ac63ec6 bitrate=  13.4kbits/s    
0,          5,          5,        1,    21466, 0x3a5edae10 bitrate=  13.1kbits/s    
0,          6,          6,        1,    15290, 0x9fb36a832:-22.-77 bitrate=N/A    
0,          7,          7,        1,    19601, 0x8af6664a
0,          8,          8,        1,    20217, 0x96032e30
0,          9,          9,        1,    16655, 0x6e0a0985
0,         10,         10,        1,    18492, 0x12b572b4
0,         11,         11,        1,    18118, 0x6b1994d6
frame=   12 fps=0.7 q=0.0 Lsize=       1kB time=00:00:00.48 bitrate=  12.2kbits/s    
video:218kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead -99.671165%
==10123== ----------------------------------------------------------------
==10123== 
==10123== Lock at 0x1038AD20 was first observed
==10123==    at 0x4C2E96A: pthread_mutex_init (in /usr/lib/valgrind/vgpreload_helgrind-amd64-linux.so)
==10123==    by 0x5B75323: default_lockmgr_cb (utils.c:81)
==10123==    by 0x5B7AD9D: ff_lock_avcodec (utils.c:3299)
==10123==    by 0x5B7B07C: avcodec_open2 (utils.c:1193)
==10123==    by 0x54647A3: avformat_find_stream_info (utils.c:2993)
==10123==    by 0x412DE0: open_input_file (ffmpeg_opt.c:860)
==10123==    by 0x4177C0: ffmpeg_parse_options (ffmpeg_opt.c:2597)
==10123==    by 0x406F20: main (ffmpeg.c:3600)
==10123== 
==10123== Possible data race during write of size 4 at 0x10385924 by thread #1
==10123== Locks held: 1, at address 0x1038AD20
==10123==    at 0x5AD50FD: ff_frame_thread_free (pthread_frame.c:565)
==10123==    by 0x5754DBA: avcodec_close (utils.c:2602)
==10123==    by 0x407618: main (ffmpeg.c:3491)
==10123== 
==10123== Address 0x10385924 is 68 bytes inside a block of size 72 alloc'd
==10123==    at 0x4C2BA30: memalign (in /usr/lib/valgrind/vgpreload_helgrind-amd64-linux.so)
==10123==    by 0x4C2BB57: posix_memalign (in /usr/lib/valgrind/vgpreload_helgrind-amd64-linux.so)
==10123==    by 0x6E4A7AC: av_malloc (mem.c:94)
==10123==    by 0x6E4A96D: av_mallocz (mem.c:244)
==10123==    by 0x5AD53E5: ff_frame_thread_init (pthread_frame.c:641)
==10123==    by 0x5B7B5FF: avcodec_open2 (utils.c:1313)
==10123==    by 0x4214D7: transcode_init (ffmpeg.c:2144)
==10123==    by 0x406F8E: main (ffmpeg.c:3413)
==10123== 
==10123== 
==10123== For counts of detected and suppressed errors, rerun with: -v
==10123== Use --history-level=approx or =none to gain increased speed, at
==10123== the cost of reduced accuracy of conflicting-access information
==10123== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 2274 from 350)

Attachments (1)

sf.h264 (9.4 KB) - added by Cigaes 5 years ago.

Download all attachments as: .zip

Change History (8)

Changed 5 years ago by Cigaes

comment:1 Changed 5 years ago by cehoyos

I can only reproduce the helgrind output, not the different framecrc output for different thread counts. Is the problem reproducible for you with ./configure && make?

comment:2 Changed 5 years ago by Cigaes

I just checked: with just ./configure I do not get the issue, but it happens with --enable-shared. Thanks for testing.

comment:3 Changed 5 years ago by cehoyos

I tested with ./configure --enable-shared && make but I am still unable to reproduce a different number of output frames between -threads 4 and -threads 5.
Does it make a difference if you run either decoding or encoding with a different number of threads (1)?

comment:4 Changed 5 years ago by Cigaes

It does indeed make a difference:

./ffmpeg_g -threads 5 -i /tmp/sf.h264 -f framecrc -threads 7 -c png -
./ffmpeg_g -threads 5 -i /tmp/sf.h264 -f framecrc -threads 8 -c png -

give respectively:

ffmpeg version N-60813-g44b22bb Copyright (c) 2000-2014 the FFmpeg developers
  built on Feb 22 2014 09:46:05 with gcc 4.8 (Debian 4.8.2-15)
  configuration: --enable-shared --disable-static --enable-gpl --enable-libx264 --enable-libopus --enable-libass --enable-libfreetype --enable-opengl --assert-level=2
  libavutil      52. 65.100 / 52. 65.100
  libavcodec     55. 52.102 / 55. 52.102
  libavformat    55. 33.100 / 55. 33.100
  libavdevice    55. 10.100 / 55. 10.100
  libavfilter     4.  1.103 /  4.  1.103
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Input #0, h264, from '/tmp/sf.h264':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuv444p, 320x240 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 1200k tbn, 50 tbc
#software: Lavf55.33.100
#tb 0: 1/25
Output #0, framecrc, to 'pipe:':
  Metadata:
    encoder         : Lavf55.33.100
    Stream #0:0: Video: png, rgb24, 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> png)
Press [q] to stop, [?] for help
0,          0,          0,        1,    14600, 0x4d4b3314
0,          1,          1,        1,    20624, 0x9d04c3da
0,          2,          2,        1,    20373, 0x3224514e
0,          3,          3,        1,    16474, 0x5a53824a
0,          4,          4,        1,    20997, 0xe2ac63ec
0,          5,          5,        1,    21466, 0x3a5edae1
0,          6,          6,        1,    15290, 0x9fb36a83
0,          7,          7,        1,    19601, 0x8af6664a
0,          8,          8,        1,    20217, 0x96032e30
0,          9,          9,        1,    16655, 0x6e0a0985
0,         10,         10,        1,    18492, 0x12b572b4
0,         11,         11,        1,    18118, 0x6b1994d6
frame=   12 fps=0.0 q=0.0 Lsize=       1kB time=00:00:00.48 bitrate=  12.2kbits/s    
video:218kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead -99.671165%
ffmpeg version N-60813-g44b22bb Copyright (c) 2000-2014 the FFmpeg developers
  built on Feb 22 2014 09:46:05 with gcc 4.8 (Debian 4.8.2-15)
  configuration: --enable-shared --disable-static --enable-gpl --enable-libx264 --enable-libopus --enable-libass --enable-libfreetype --enable-opengl --assert-level=2
  libavutil      52. 65.100 / 52. 65.100
  libavcodec     55. 52.102 / 55. 52.102
  libavformat    55. 33.100 / 55. 33.100
  libavdevice    55. 10.100 / 55. 10.100
  libavfilter     4.  1.103 /  4.  1.103
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Input #0, h264, from '/tmp/sf.h264':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuv444p, 320x240 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 1200k tbn, 50 tbc
#software: Lavf55.33.100
#tb 0: 1/25
Output #0, framecrc, to 'pipe:':
  Metadata:
    encoder         : Lavf55.33.100
    Stream #0:0: Video: png, rgb24, 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> png)
Press [q] to stop, [?] for help
Error while decoding stream #0:0: Invalid data found when processing input
[h264 @ 0x2310680] reference picture missing during reorder
    Last message repeated 1 times
[h264 @ 0x2310680] Missing reference picture, default is 65548
    Last message repeated 1 times
[h264 @ 0x23554c0] reference picture missing during reorder
[h264 @ 0x23554c0] Missing reference picture, default is 65556
0,          0,          0,        1,    14600, 0x4d4b3314
0,          1,          1,        1,    20624, 0x9d04c3da
0,          3,          3,        1,    20373, 0x3224514e
0,          4,          4,        1,    16474, 0x5a53824a
0,          5,          5,        1,    21099, 0x61cb8a88
0,          6,          6,        1,    21466, 0x7d3727ad
0,          8,          8,        1,    15370, 0x4b0bcbbd
0,          9,          9,        1,    19775, 0xed275f1c
0,         10,         10,        1,    16851, 0x0725c06b
0,         11,         11,        1,    16717, 0xd445fc7c
frame=   10 fps=0.0 q=0.0 Lsize=       1kB time=00:00:00.48 bitrate=  10.3kbits/s    
video:179kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead -99.663483%

comment:5 Changed 5 years ago by cehoyos

  • Keywords h264 added

Is this still reproducible?

comment:6 Changed 8 months ago by richardpl

Same question.

comment:7 Changed 8 months ago by cehoyos

  • Reproduced by developer set
  • Status changed from new to open

Happens only rarely, helgrind still shows issues.

$ ffmpeg -i ../sf.h264 -f crc -vcodec png -
ffmpeg version N-92703-gc6e1966 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 8.2.1 (GCC) 20180813 (Advance-Toolchain-at12.0) [revision 263510]
  configuration: --cpu=power7 --enable-gpl cc=/opt/at12.0/bin/gcc
  libavutil      56. 24.101 / 56. 24.101
  libavcodec     58. 42.101 / 58. 42.101
  libavformat    58. 24.101 / 58. 24.101
  libavdevice    58.  6.101 / 58.  6.101
  libavfilter     7. 46.101 /  7. 46.101
  libswscale      5.  4.100 /  5.  4.100
  libswresample   3.  4.100 /  3.  4.100
  libpostproc    55.  4.100 / 55.  4.100
[h264 @ 0x10016471880] top block unavailable for requested intra mode -1
[h264 @ 0x10016471880] error while decoding MB 19 0, bytestream 2784
[h264 @ 0x10016471880] concealing 300 DC, 300 AC, 300 MV errors in I frame
Input #0, h264, from '../sf.h264':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuv444p(progressive), 320x240 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 1200k tbn, 50 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> png (native))
Press [q] to stop, [?] for help
[h264 @ 0x100164d26e0] top block unavailable for requested intra mode -1
[h264 @ 0x100164d26e0] error while decoding MB 19 0, bytestream 2784
[h264 @ 0x100164d26e0] concealing 300 DC, 300 AC, 300 MV errors in I frame
[h264 @ 0x10016474210] error while decoding MB 2 14, bytestream -7
[h264 @ 0x10016474210] concealing 67 DC, 67 AC, 67 MV errors in P frame
[h264 @ 0x100164cbf10] error while decoding MB 18 13, bytestream -12
[h264 @ 0x100164cbf10] concealing 71 DC, 71 AC, 71 MV errors in B frame
[h264 @ 0x10016516a90] cabac decode of qscale diff failed at 14 13
[h264 @ 0x10016516a90] error while decoding MB 14 13, bytestream 167
[h264 @ 0x10016516a90] concealing 75 DC, 75 AC, 75 MV errors in B frame
Output #0, crc, to 'pipe:':
  Metadata:
    encoder         : Lavf58.24.101
    Stream #0:0: Video: png, rgb24, 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
    Metadata:
      encoder         : Lavc58.42.101 png
CRC=0xbbe0fd50
frame=   12 fps=0.0 q=-0.0 Lsize=       0kB time=00:00:00.48 bitrate=   0.2kbits/s speed=9.99x
video:103kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
$ ffmpeg -i ../sf.h264 -f crc -vcodec png -
ffmpeg version N-92703-gc6e1966 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 8.2.1 (GCC) 20180813 (Advance-Toolchain-at12.0) [revision 263510]
  configuration: --cpu=power7 --enable-gpl cc=/opt/at12.0/bin/gcc
  libavutil      56. 24.101 / 56. 24.101
  libavcodec     58. 42.101 / 58. 42.101
  libavformat    58. 24.101 / 58. 24.101
  libavdevice    58.  6.101 / 58.  6.101
  libavfilter     7. 46.101 /  7. 46.101
  libswscale      5.  4.100 /  5.  4.100
  libswresample   3.  4.100 /  3.  4.100
  libpostproc    55.  4.100 / 55.  4.100
[h264 @ 0x1002fbb1880] top block unavailable for requested intra mode -1
[h264 @ 0x1002fbb1880] error while decoding MB 19 0, bytestream 2784
[h264 @ 0x1002fbb1880] concealing 300 DC, 300 AC, 300 MV errors in I frame
Input #0, h264, from '../sf.h264':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuv444p(progressive), 320x240 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 1200k tbn, 50 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> png (native))
Press [q] to stop, [?] for help
[h264 @ 0x1002fc126e0] top block unavailable for requested intra mode -1
[h264 @ 0x1002fc126e0] error while decoding MB 19 0, bytestream 2784
[h264 @ 0x1002fc126e0] concealing 300 DC, 300 AC, 300 MV errors in I frame
[h264 @ 0x1002fbb4210] error while decoding MB 2 14, bytestream -7
[h264 @ 0x1002fbb4210] concealing 67 DC, 67 AC, 67 MV errors in P frame
[h264 @ 0x1002fc0bf10] error while decoding MB 18 13, bytestream -12
[h264 @ 0x1002fc0bf10] concealing 71 DC, 71 AC, 71 MV errors in B frame
[h264 @ 0x1002fc56a90] cabac decode of qscale diff failed at 14 13
[h264 @ 0x1002fc56a90] error while decoding MB 14 13, bytestream 167
[h264 @ 0x1002fc56a90] concealing 75 DC, 75 AC, 75 MV errors in B frame
Output #0, crc, to 'pipe:':
  Metadata:
    encoder         : Lavf58.24.101
    Stream #0:0: Video: png, rgb24, 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
    Metadata:
      encoder         : Lavc58.42.101 png
CRC=0x54a738a1
frame=   12 fps=0.0 q=-0.0 Lsize=       0kB time=00:00:00.48 bitrate=   0.2kbits/s speed=10.6x
video:104kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
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