[FFmpeg-trac] #3871(avcodec:new): FFmpeg MD5 output different with same data #2

FFmpeg trac at avcodec.org
Tue Aug 19 21:13:06 CEST 2014


#3871: FFmpeg MD5 output different with same data #2
--------------------------------------+----------------------------------
             Reporter:  ahthovaikied  |                     Type:  defect
               Status:  new           |                 Priority:  normal
            Component:  avcodec       |                  Version:  2.2.4
             Keywords:  md5           |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
--------------------------------------+----------------------------------
 Computing the MD5 of media streams produce different results between two
 of my machines, with same input data.

 I learned my lesson in bug https://trac.ffmpeg.org/ticket/3524#comment:9
 and I am calculating the checksums WITHOUT decoding.

 The 2 configurations are :
 * Ubuntu 14.04, Core i7 950, FFmpeg compiled with:
 {{{
 --enable-gpl --enable-version3 --enable-nonfree --disable-runtime-
 cpudetect --disable-ffserver --disable-encoder=vorbis --disable-
 encoder=aac --enable-x11grab --enable-libfdk-aac --enable-libmp3lame
 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus
 --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx
 --enable-libx264 --enable-libxvid --disable-debug --extra-libs=-ldl
 --cpu=corei7
 }}}
 * Ubuntu 14.04, Atom D525, FFmpeg compiled with:
 {{{
 --enable-gpl --enable-version3 --enable-nonfree --disable-runtime-
 cpudetect --disable-ffserver --disable-ffplay --disable-encoders
 --disable-decoders --disable-debug --cpu=atom
 }}}

 I get different MD5 for several video files I tried, ie
 http://www.auby.no/files/video_tests/h264_720p_hp_3.1_600kbps_aac_mp3_dual_audio_harry_potter.mkv.

 Sample output:
 {{{
 $ ffmpeg -i h264_720p_hp_3.1_600kbps_aac_mp3_dual_audio_harry_potter.mkv
 -c:v copy -c:a copy -f md5 -
 ffmpeg version N-65758-g746095b Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Aug 19 2014 20:11:25 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
   configuration: --enable-gpl --enable-version3 --enable-nonfree
 --disable-runtime-cpudetect --disable-ffserver --disable-ffplay --disable-
 encoders --disable-decoders --disable-debug --cpu=atom
   libavutil      54.  5.100 / 54.  5.100
   libavcodec     56.  0.101 / 56.  0.101
   libavformat    56.  1.100 / 56.  1.100
   libavdevice    56.  0.100 / 56.  0.100
   libavfilter     5.  0.100 /  5.  0.100
   libswscale      3.  0.100 /  3.  0.100
   libswresample   1.  1.100 /  1.  1.100
   libpostproc    53.  0.100 / 53.  0.100
 [matroska,webm @ 0x259dc20] Could not find codec parameters for stream 2
 (Audio: mp3, 48000 Hz, 2 channels, 160 kb/s): unspecified frame size
 Consider increasing the value for the 'analyzeduration' and 'probesize'
 options
 Guessed Channel Layout for  Input Stream #0.1 : stereo
 Guessed Channel Layout for  Input Stream #0.2 : stereo
 Input #0, matroska,webm, from
 'h264_720p_hp_3.1_600kbps_aac_mp3_dual_audio_harry_potter.mkv':
   Metadata:
     title           : Harry Potter 4[Eng-Hindi]Dual.Audio BRRIP
 720p-=[champ_is_here]=-
     encoder         : libebml v1.0.0 + libmatroska v1.0.0
     creation_time   : 2011-01-07 07:42:53
   Duration: 00:00:57.61, start: 0.000000, bitrate: 613 kb/s
     Stream #0:0(eng): Video: h264 (High), yuv420p, 1280x528 [SAR 1:1 DAR
 80:33], 25 fps, 25 tbr, 1k tbn, 47.95 tbc
     Metadata:
       title           : -=[champ_is_here]=-
     Stream #0:1(eng): Audio: aac, 48000 Hz, 2 channels
     Metadata:
       title           : -=[champ_is_here]=-
     Stream #0:2(hin): Audio: mp3, 48000 Hz, 2 channels, 160 kb/s
     Metadata:
       title           : -=[champ_is_here]=-
 Output #0, md5, to 'pipe:':
   Metadata:
     title           : Harry Potter 4[Eng-Hindi]Dual.Audio BRRIP
 720p-=[champ_is_here]=-
     encoder         : Lavf56.1.100
     Stream #0:0(eng): Video: h264, yuv420p, 1280x528 [SAR 1:1 DAR 80:33],
 q=2-31, 25 fps, 23.98 tbn, 23.98 tbc
     Metadata:
       title           : -=[champ_is_here]=-
     Stream #0:1(eng): Audio: aac, 48000 Hz, stereo
     Metadata:
       title           : -=[champ_is_here]=-
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
   Stream #0:1 -> #0:1 (copy)
 Press [q] to stop, [?] for help
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 12 >= 12
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 35 >= 35
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 59 >= 59
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 83 >= 83
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 106 >= 106
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 129 >= 129
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 153 >= 153
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 176 >= 176
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 199 >= 199
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 222 >= 222
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 246 >= 246
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 270 >= 270
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 293 >= 293
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 317 >= 317
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 340 >= 340
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 364 >= 364
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 387 >= 387
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 410 >= 410
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 434 >= 434
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 457 >= 457
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 481 >= 481
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 505 >= 505
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 528 >= 528
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 551 >= 551
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 574 >= 574
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 598 >= 598
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 622 >= 622
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 645 >= 645
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 668 >= 668
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 692 >= 692
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 715 >= 715
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 739 >= 739
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 762 >= 762
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 786 >= 786
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 809 >= 809
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 832 >= 832
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 856 >= 856
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 879 >= 879
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 903 >= 903
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 926 >= 926
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 949 >= 949
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 973 >= 973
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 996 >= 996
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 1020 >= 1020
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 1044 >= 1044
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 1067 >= 1067
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 1090 >= 1090
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 1114 >= 1114
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 1137 >= 1137
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 1161 >= 1161
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 1184 >= 1184
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 1208 >= 1208
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 1231 >= 1231
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 1254 >= 1254
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 1278 >= 1278
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 1301 >= 1301
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 1325 >= 1325
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 1348 >= 1348
 [md5 @ 0x273cca0] Application provided invalid, non monotonically
 increasing dts to muxer in stream 0: 1371 >= 1371
 MD5=487e837f7c08ee07cf44e8b473911a06
 frame= 1439 fps=0.0 q=-1.0 Lsize=       0kB time=00:00:57.56 bitrate=
 0.0kbits/s
 video:2917kB audio:257kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown
 }}}

 Here is the summary of the results I get :
 * Atom machine, FFmpeg 2.2.7
   => MD5=527e3ac28a2b5175e1a0a871b0e9f9c3
 * Atom machine, FFmpeg from git master commit
 746095bc29817875ac89a7d4771f8a54895b3cbb
   => MD5=487e837f7c08ee07cf44e8b473911a06
 * Atom machine, FFmpeg from git master commit
 746095bc29817875ac89a7d4771f8a54895b3cbb without --disable-decoders
   => MD5=487e837f7c08ee07cf44e8b473911a06
 * Core i7 machine, FFmpeg 2.2.7
   => MD5=33a157ebc4fcdf3b1fa75546d67c6364
 * Core i7 machine, FFmpeg from git master commit
 746095bc29817875ac89a7d4771f8a54895b3cbb
   => MD5=487e837f7c08ee07cf44e8b473911a06

 So it seems it has been fixed on git master, and the right MD5 is
 487e837f7c08ee07cf44e8b473911a06.

 Can anyone confirm this is a known bug that has been fixed?
 And if yes, is it planned to backport the fix on the 2.2 branch?

 Thank you

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3871>
FFmpeg <https://ffmpeg.org>
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