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

[FFmpeg]

#4088: Theora video duration different depending on scale
-------------------------------------+-------------------------------------
             Reporter:  mlinnosk     |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  2.4.3        |  undetermined
             Keywords:  theora,pipe  |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------

Comment (by mlinnosk):

 Using 'MKV' container seems to produce duration of '15.68' which is
 correct. Even more weird!

 {{{
 unzip -p input.zip 1920x1200/raw/f_*.png | ffmpeg2 -loglevel verbose -f
 image2pipe -c:v png -r 25 -i - -s 1024x640 -aspect 16:10 -sws_flags
 lanczos -vcodec libtheora -pix_fmt yuv420p -an -qscale:v 7 -r 25 -y
 output.mkv
 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
 Input #0, image2pipe, from 'pipe:':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: png, rgba, 1920x1200, 25 fps, 25 tbr, 25 tbn, 25
 tbc
 [graph 0 input from stream 0:0 @ 0x39231c0] w:1920 h:1200 pixfmt:rgba
 tb:1/25 fr:25/1 sar:0/1 sws_param:flags=2
 [scaler for output stream 0:0 @ 0x391bd80] w:1024 h:640 flags:'0x200'
 interl:0
 [graph 0 input from stream 0:0 @ 0x39231c0] TB:0.040000
 FRAME_RATE:25.000000 SAMPLE_RATE:nan
 [scaler for output stream 0:0 @ 0x391bd80] w:1920 h:1200 fmt:rgba sar:0/1
 -> w:1024 h:640 fmt:yuv420p sar:0/1 flags:0x200
 Output #0, matroska, to 'output.mkv':
   Metadata:
     encoder         : Lavf56.4.101
     Stream #0:0: Video: theora (libtheora) (theo / 0x6F656874), yuv420p,
 1024x640 [SAR 1:1 DAR 8:5], q=2-31, 200 kb/s, 25 fps, 1k tbn, 25 tbc
     Metadata:
       encoder         : Lavc56.1.100 libtheora
 Stream mapping:
   Stream #0:0 -> #0:0 (png (native) -> theora (libtheora))
 No more output streams to write to, finishing.=00:00:15.60
 bitrate=1726.0kbits/s
 frame=  392 fps= 18 q=0.0 Lsize=    3288kB time=00:00:15.68
 bitrate=1717.6kbits/s
 video:3280kB audio:0kB subtitle:0kB other streams:0kB global headers:3kB
 muxing overhead: 0.238594%
 Input file #0 (pipe:):
   Input stream #0:0 (video): 392 packets read (609131299 bytes); 392
 frames decoded;
   Total: 392 packets (609131299 bytes) demuxed
 Output file #0 (output.mkv):
   Output stream #0:0 (video): 392 frames encoded; 392 packets muxed
 (3358425 bytes);
   Total: 392 packets (3358425 bytes) muxed
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/4088#comment:8>
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