[FFmpeg-trac] #9272(ffmpeg:new): Unstable outputs of ffmpeg

FFmpeg trac at avcodec.org
Tue Jun 1 01:42:27 EEST 2021


#9272: Unstable outputs of ffmpeg
------------------------------------+--------------------------------------
             Reporter:  Shaohua Li  |                     Type:  defect
               Status:  new         |                 Priority:  normal
            Component:  ffmpeg      |                  Version:  git-master
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+--------------------------------------
 Summary of the bug: For some inputs, ffmpeg's output file will change per
 run.

 Compile args: ./configure

 Compiler: gcc11

 How to reproduce: (run the following command several times, and check the
 size of '''unstable_output''' in each run. )
 {{{
 % ffmpeg -i unstable_input -f mp4 unstable_output
 ffmpeg version N-102631-gbaf5cc5b7a Copyright (c) 2000-2021 the FFmpeg
 developers
   built with gcc 11 (Ubuntu 11.1.0-1ubuntu1~20.04)
   configuration: --cc=gcc-11 --cxx=g++-11 --ld='g++-11 -fno-sanitize=vptr
 -std=c++11' --extra-cflags=-I/data/afl_compiler/programs/ffmpeg/src/head-
 gcc11/ffmpeg_deps/include --extra-
 ldflags=-L/data/afl_compiler/programs/ffmpeg/src/head-
 gcc11/ffmpeg_deps/lib --prefix=/data/afl_compiler/programs/ffmpeg/src
 /head-gcc11/ffmpeg_deps --pkg-config-flags=--static --disable-shared
   libavutil      57.  0.100 / 57.  0.100
   libavcodec     59.  1.100 / 59.  1.100
   libavformat    59.  2.101 / 59.  2.101
   libavdevice    59.  0.100 / 59.  0.100
   libavfilter     8.  0.101 /  8.  0.101
   libswscale      6.  0.100 /  6.  0.100
   libswresample   4.  0.100 /  4.  0.100
 [avi @ 0x5561e674d700] Something went wrong during header parsing, tag
 IST[4] has size 1862270977, I will ignore it and try to continue anyway.
 Guessed Channel Layout for Input Stream #0.1 : stereo
 Input #0, avi, from 'bugs/diff_0':
   Duration: 00:00:01.67, start: 0.000000, bitrate: 1021 kb/s
   Stream #0:0: Video: mpeg4 (DIVX / 0x58564944), yuv420p, 352x240 [SAR 1:1
 DAR 22:15], 29.97 fps, 29.97 tbr, 29.97 tbn
   Stream #0:1: Audio: pcm_alaw ([6][0][0][0] / 0x0006), 44100 Hz, stereo,
 s16, 705 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (mpeg4 (native) -> mpeg4 (native))
   Stream #0:1 -> #0:1 (pcm_alaw (native) -> aac (native))
 Press [q] to stop, [?] for help
 [mpeg4 @ 0x5561e6783d40] ac-tex damaged at 7 3
 [mpeg4 @ 0x5561e6783d40] Error at MB: 76
 [mpeg4 @ 0x5561e6783d40] concealing 306 DC, 306 AC, 306 MV errors in I
 frame
 bugs/diff_0: corrupt decoded frame in stream 0
 Output #0, mp4, to '.output':
   Metadata:
     encoder         : Lavf59.2.101
   Stream #0:0: Video: mpeg4 (mp4v / 0x7634706D), yuv420p(progressive),
 352x240 [SAR 1:1 DAR 22:15], q=2-31, 200 kb/s, 29.97 fps, 11988 tbn
     Metadata:
       encoder         : Lavc59.1.100 mpeg4
     Side data:
       cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
   Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo,
 fltp, 128 kb/s
     Metadata:
       encoder         : Lavc59.1.100 aac
 [mpeg4 @ 0x5561e6783d40] P cbpy damaged at 10 300:00:00.74 bitrate=
 0.5kbits/s speed=4.59x
 [mpeg4 @ 0x5561e6783d40] Error at MB: 79
 [mpeg4 @ 0x5561e6783d40] concealing 329 DC, 329 AC, 329 MV errors in P
 frame
 [mpeg4 @ 0x5561e6779dc0] P cbpy damaged at 17 5
 [mpeg4 @ 0x5561e6779dc0] Error at MB: 132
 [mpeg4 @ 0x5561e6779dc0] marker does not match f_code
 [mpeg4 @ 0x5561e6779dc0] concealing 257 DC, 257 AC, 257 MV errors in P
 frame
 [mpeg4 @ 0x5561e678fa80] P cbpy damaged at 3 4
 [mpeg4 @ 0x5561e678fa80] Error at MB: 95
 [mpeg4 @ 0x5561e678fa80] concealing 303 DC, 303 AC, 303 MV errors in P
 frame
 bugs/diff_0: corrupt decoded frame in stream 0
     Last message repeated 1 times
 [mpeg4 @ 0x5561e6779dc0] 2. marker bit missing in 3. esc
 [mpeg4 @ 0x5561e6779dc0] Error at MB: 39
 [mpeg4 @ 0x5561e6779dc0] marker does not match f_code
 [mpeg4 @ 0x5561e6779dc0] concealing 330 DC, 330 AC, 330 MV errors in P
 frame
 bugs/diff_0: corrupt decoded frame in stream 0
     Last message repeated 1 times
 [mpeg4 @ 0x5561e677af00] Error at MB: 117
 [mpeg4 @ 0x5561e677af00] concealing 267 DC, 267 AC, 267 MV errors in I
 frame
 [mpeg4 @ 0x5561e6796200] ac-tex damaged at 12 0
 [mpeg4 @ 0x5561e6796200] Error at MB: 12
 [mpeg4 @ 0x5561e6796200] concealing 330 DC, 330 AC, 330 MV errors in P
 frame
 bugs/diff_0: corrupt decoded frame in stream 0
 [mpeg4 @ 0x5561e677af00] ac-tex damaged at 6 1
 [mpeg4 @ 0x5561e677af00] Error at MB: 29
 [mpeg4 @ 0x5561e677af00] concealing 330 DC, 330 AC, 330 MV errors in P
 frame
 bugs/diff_0: corrupt decoded frame in stream 0
     Last message repeated 1 times
 frame=   45 fps=0.0 q=3.9 Lsize=     104kB time=00:00:01.60 bitrate=
 532.8kbits/s speed=3.41x
 video:77kB audio:25kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 2.671106%
 [aac @ 0x5561e677ebc0] Qavg: 185.202
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9272>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker


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