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Old 12th January 2009, 19:06   #1  |  Link
dcrht
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Mencoder b-frame question

Hi, I am a newbie who just started to learn how to encode about 2 weeks ago. Everything seems OK but when I try to use B-frame, there is stuttering produced (but nothing wrong in mplayer).

I cancel all options except b-frame in this video.

mencoder Robotica_1080.wmv -o test.mp4 -nosound -ovc x264 -x264encopts bitrate=1350:bframes=1:level=41:global_header:keyint=150 -vf scale=640:-2,expand=aspect=16/9 -fps 24000/1001 -of lavf

Please help me

--
Video source: http://download.microsoft.com/downlo...otica_1080.exe
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Old 12th January 2009, 19:17   #2  |  Link
nm
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MEncoder does not support MP4 output with libavformat perfectly. Just output the video as an H.264 elementary stream (-of rawvideo -o video.264) and mux it later with MP4Box.
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Old 12th January 2009, 19:20   #3  |  Link
LoRd_MuldeR
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MEncoder displays this warning for a reason, I think

Code:
** MUXER_LAVF *****************************************************************
REMEMBER: MEncoder's libavformat muxing is presently broken and can generate
INCORRECT files in the presence of B-frames. Moreover, due to bugs MPlayer
will play these INCORRECT files as if nothing were wrong!
*******************************************************************************
Solution: Use the "standalone" x264 CLI encoder. MEncoder can write "raw" output to STDOUT and x264.exe can grab the frames from STDIN.

x264 does write proper MP4 and MKV files.
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Last edited by LoRd_MuldeR; 12th January 2009 at 19:27.
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Old 14th January 2009, 01:38   #4  |  Link
recover
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It's pretty funny that both libavformat and MPlayer are broken and in effect they work together :P
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Old 14th January 2009, 01:57   #5  |  Link
Dark Shikari
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Quote:
Originally Posted by recover View Post
It's pretty funny that both libavformat and MPlayer are broken and in effect they work together :P
Libavformat isn't broken--the way mencoder interfaces with it is.
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