[FFmpeg-trac] #4088(undetermined:new): Theora video duration different depending on scale

[FFmpeg]

#4088: Theora video duration different depending on scale
--------------------------------------+----------------------------------
             Reporter:  mlinnosk      |                     Type:  defect
               Status:  new           |                 Priority:  normal
            Component:  undetermined  |                  Version:  2.4.3
             Keywords:  theora,pipe   |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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 Summary of the bug:
 When converting PNG image sequence to 'Ogg/Theora' video.
 With same input, but different output scaling the resulting video file has
 different duration and drops frames from the end.

 Tested with same setup but with '-vcodec mpeg4' and can't reproduce.
 Observed with '-vcodec libtheora'. Also the '-sws_flags lancoz' doesn't
 seem to make difference.

 The test material has 392 frames and ffmpeg seems to process them all.

 How to reproduce:
 {{{
 unzip -p $INPUT_FILE $IMAGE_GLOB | -loglevel quiet -f image2pipe -c:v png
 -r 25 -i - -s $RESOLUTION -aspect 16:10 -sws_flags lanczos -vcodec
 libtheora -pix_fmt yuv420p -an -qscale:v $QS -r 25 -y $OUTPUT_FILE
 }}}
 Info:
 {{{
 ffmpeg version 2.4.3-   http://johnvansickle.com/ffmpeg/    Copyright (c)
 2000-2014 the FFmpeg developers
 built on Nov  4 2014 13:14:24 with gcc 4.8 (Debian 4.8.3-13)
 configuration: --enable-gpl --enable-version3 --disable-shared --disable-
 debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264
 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis
 --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid
 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora
 --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-
 libopenjpeg --enable-libopus --disable-ffserver --enable-libass --enable-
 gnutls --cc=gcc-4.8
 libavutil      54.  7.100 / 54.  7.100
 libavcodec     56.  1.100 / 56.  1.100
 libavformat    56.  4.101 / 56.  4.101
 libavdevice    56.  0.100 / 56.  0.100
 libavfilter     5.  1.100 /  5.  1.100
 libswscale      3.  0.100 /  3.  0.100
 libswresample   1.  1.100 /  1.  1.100
 libpostproc    53.  0.100 / 53.  0.100


 Output1:
 Input #0, ogg, from 'file1.ogv':
   Duration: 00:00:15.68, start: 0.000000, bitrate: 2423 kb/s
     Stream #0:0: Video: theora, yuv420p, 1280x800 [SAR 1:1 DAR 8:5], 25
 tbr, 25 tbn, 25 tbc
     Metadata:
       ENCODER         : Lavc56.1.100 libtheora

 Output2:
 Input #0, ogg, from 'file2.ogv':
   Duration: 00:00:15.24, start: 0.000000, bitrate: 1773 kb/s
     Stream #0:0: Video: theora, yuv420p, 1024x640 [SAR 1:1 DAR 8:5], 25
 tbr, 25 tbn, 25 tbc
     Metadata:
       ENCODER         : Lavc56.1.100 libtheora

 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4088>
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