[FFmpeg-trac] #3091(undetermined:new): High Bitrate I-frame CBR MPEG encoding causes error
FFmpeg
trac at avcodec.org
Thu Nov 7 05:23:39 CET 2013
#3091: High Bitrate I-frame CBR MPEG encoding causes error
-------------------------------------+-------------------------------------
Reporter: ortoni | Owner:
Type: defect | Status: new
Priority: normal | Component:
Version: unspecified | undetermined
Keywords: | Resolution:
Blocking: | Blocked By:
Analyzed by developer: 0 | Reproduced by developer: 0
-------------------------------------+-------------------------------------
Comment (by ortoni):
Sorry was following your exact CLI above - thought that was odd. Correct
output below, seems unchanged :
f86387bffmpeg.exe" -i c:\tmpdir\work.m2v -vcodec mpeg2video -pix_fmt
yuv422p -intra -flags +ildct+ilme -b:v 150M -maxrate 150M -minrate 150M
-bt 6M -bufsize 47185920 -r 25 -an -y c:\tmpdir\xdcam.m2v
ffmpeg version N-57605-gf86387b Copyright (c) 2000-2013 the FFmpeg
developers
built on Oct 29 2013 18:01:53 with gcc 4.8.2 (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. 48.100 / 52. 48.100
libavcodec 55. 39.100 / 55. 39.100
libavformat 55. 19.104 / 55. 19.104
libavdevice 55. 5.100 / 55. 5.100
libavfilter 3. 90.100 / 3. 90.100
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
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(tv, bt709), 1920x1080
[SAR 1:1 DAR 16:9], max. 50000 kb/s, 25 fps, 25 tbr, 1200k tbn, 50 tbc
[mpeg2video @ 02618b20] 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
Using -bt 8M proceeds:
f86387bffmpeg.exe" -i c:\tmpdir\work.m2v -vcodec mpeg2video -pix_fmt
yuv422p -intra -flags +ildct+ilme -b:v 150M -maxrate 150M -minrate 150M
-bt 8M -bufsize 47185920 -r 25 -an -y c:\tmpdir\xdcam.m2v
ffmpeg version N-57605-gf86387b Copyright (c) 2000-2013 the FFmpeg
developers
built on Oct 29 2013 18:01:53 with gcc 4.8.2 (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. 48.100 / 52. 48.100
libavcodec 55. 39.100 / 55. 39.100
libavformat 55. 19.104 / 55. 19.104
libavdevice 55. 5.100 / 55. 5.100
libavfilter 3. 90.100 / 3. 90.100
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
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(tv, bt709), 1920x1080
[SAR 1:1 DAR 16:9], max. 50000 kb/s, 25 fps, 25 tbr, 1200k tbn, 50 tbc
Output #0, mpeg2video, to 'c:\tmpdir\xdcam.m2v':
Metadata:
encoder : Lavf55.19.104
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)
Press [q] to stop, [?] for help
frame= 500 fps= 58 q=1.6 Lsize= 364771kB time=00:00:19.96
bitrate=149709.6kbits/s
video:364771kB audio:0kB subtitle:0 global headers:0kB muxing overhead
0.000000%
but this encoding above shows in MediaInfo:
Bit rate : 149 Mbps
Maximum bit rate : 46.8 Mbps
and my m2v essence tool shows at bitrate of 45,142,400 and VBV size=
13,631,488 in the Sequence header,
But 99M is happy:
f86387bffmpeg.exe" -i c:\tmpdir\work.m2v -vcodec mpeg2video -pix_fmt
yuv422p -intra -flags +ildct+ilme -b:v 99M -maxrate 99M -minrate 99M -bt
6M -bufsize 47185920 -r 25 -an -y c:\tmpdir\xdcam.m2v
ffmpeg version N-57605-gf86387b Copyright (c) 2000-2013 the FFmpeg
developers
built on Oct 29 2013 18:01:53 with gcc 4.8.2 (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. 48.100 / 52. 48.100
libavcodec 55. 39.100 / 55. 39.100
libavformat 55. 19.104 / 55. 19.104
libavdevice 55. 5.100 / 55. 5.100
libavfilter 3. 90.100 / 3. 90.100
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
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(tv, bt709), 1920x1080
[SAR 1:1 DAR 16:9], max. 50000 kb/s, 25 fps, 25 tbr, 1200k tbn, 50 tbc
Output #0, mpeg2video, to 'c:\tmpdir\xdcam.m2v':
Metadata:
encoder : Lavf55.19.104
Stream #0:0: Video: mpeg2video, yuv422p, 1920x1080 [SAR 1:1 DAR 16:9],
q=2-31, 99000 kb/s, 90k tbn, 25 tbc
And for this one MediaInfo reports:
Overall bit rate : 98.4 Mbps
Bit rate : 99.0 Mbps
m2v sequence header bitrate = 99,000,000 and vbv = 13,631,488
Its just anything over 100Mbps seems not to encode correctly
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/3091#comment:11>
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