[FFmpeg-trac] #3091(FFmpeg:new): High Bitrate I-frame CBR MPEG encoding causes error

FFmpeg trac at avcodec.org
Tue Oct 29 03:52:06 CET 2013


#3091: High Bitrate I-frame CBR MPEG encoding causes error
--------------------------------+---------------------------------------
             Reporter:  ortoni  |                     Type:  defect
               Status:  new     |                 Priority:  normal
            Component:  FFmpeg  |                  Version:  unspecified
             Keywords:          |               Blocked By:
             Blocking:          |  Reproduced by developer:  0
Analyzed by developer:  0       |
--------------------------------+---------------------------------------
 m2v encoding of I-frame CBR mpeg at 100Mbit/sec and above gives bitrate
 tolerance too small for bitrate error. Below 100Mbit, error does not
 arise.

 reproduced with XDcam demuxed m2v file:

 ffmpeg.exe -i c:\tmpdir\work.m2v -vcodec mpeg2video -pix_fmt yuv422p
 -intra -flags +ildct+ilme -b:v 150M -minrate 150M -maxrate 150M -bufsize
 47185920 -r 25 -an -y  c:\tmpdir\xdcam.m2v
 ffmpeg version 2.0.1 Copyright (c) 2000-2013 the FFmpeg developers
   built on Sep 26 2013 01:50:16 with gcc 4.8.1 (GCC)
   configuration: --enable-gpl --enable-version3 --disable-w32threads
 --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r
 --enable-gnutls --enable-iconv --enable-libass --enable-libbluray
 --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc
 --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb
 --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-
 librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex
 --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-
 aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
 --enable-libwavpack --enable-libx264 --enable-libxavs --enable-libxvid
 --enable-zlib
   libavutil      52. 38.100 / 52. 38.100
   libavcodec     55. 18.102 / 55. 18.102
   libavformat    55. 12.100 / 55. 12.100
   libavdevice    55.  3.100 / 55.  3.100
   libavfilter     3. 79.101 /  3. 79.101
   libswscale      2.  3.100 /  2.  3.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, mpegvideo, from 'c:\tmpdir\work.m2v':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: mpeg2video (4:2:2), yuv422p, 1920x1080 [SAR 1:1
 DAR 16:9], 25 fps, 25 tbr, 1200k tbn, 50 tbc
 [mpeg2video @ 02793a60] bitrate tolerance too small for bitrate
 Output #0, mpeg2video, to 'c:\tmpdir\xdcam.m2v':
     Stream #0:0: Video: mpeg2video, yuv422p, 1920x1080 [SAR 1:1 DAR 16:9],
 q=2-31, 150000 kb/s, 90k tbn, 25 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (mpeg2video -> mpeg2video)
 Error while opening encoder for output stream #0:0 - maybe incorrect
 parameters such as bit_rate, rate, width or height


 Have source file if needed.

 TIA

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/3091>
FFmpeg <http://ffmpeg.org>
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