Any idea to avoid B frames?
Hi,all, When converting other formats to wmv format, I'd like to encode it with I frame and P frame,and not using B frame. How could I do with FFmpeg? Thx. _________________________________________________________________ ???? MSN Explorer: http://explorer.msn.com/lccn/
On date Tuesday 2007-08-28 14:33:27 +0800, Wang Cg encoded:
Hi,all, When converting other formats to wmv format, I'd like to encode it with I frame and P frame,and not using B frame. How could I do with FFmpeg?
It's strange, because if I try to encode with wmv1 or wmv2 (WMV 3 encoder isn't supported) I get: sds at santefisi ~/s/m/samples> ffmpeg -i input.mpeg -bf 5 -vcodec wmv2 -acodec wmav2 -f asf -y output.asf FFmpeg version SVN-r10230, Copyright (c) 2000-2007 Fabrice Bellard, et al. configuration: --prefix=/home/sds --mandir=/home/sds/share/man --enable-gpl --enable-pp --enable-libfaad --enable-libfaac --enable-libamr-nb --enable-libamr-wb --enable-x11grab --enable-libmp3lame libavutil version: 49.5.0 libavcodec version: 51.42.0 libavformat version: 51.12.2 built on Aug 26 2007 11:11:53, gcc: 4.1.2 20061028 (prerelease) (Debian 4.1.1-19) Input #0, mpeg, from 'aikido-orig.mpeg': Duration: 00:00:53.3, start: 0.500000, bitrate: 923 kb/s Stream #0.0[0x1e0]: Video: mpeg1video, yuv420p, 720x576, 104857 kb/s, 25.00 fps(r) Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, 64 kb/s Output #0, asf, to 'aikido-bf5.asf': Stream #0.0: Video: wmv2, yuv420p, 720x576, q=2-31, 200 kb/s, 25.00 fps(c) Stream #0.1: Audio: wmav2, 48000 Hz, stereo, 64 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 [wmv2 @ 0x84a9e48]b frames not supported by codec ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Error while opening codec for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height So even forcing the use of B frames (-bf option) I can't get B frame in the output stream. How can you say there are B frames in the output stream? Cheers. -- ffmpeg-user random tip #5 FF-mpeg documentation: http://ffmpeg.mplayerhq.hu/documentation.html
From: Stefano Sabatini <stefano.sabatini-lala at poste.it> Reply-To: FFmpeg user questions and RTFMs <ffmpeg-user at mplayerhq.hu> To: ffmpeg-user at mplayerhq.hu Subject: Re: [Ffmpeg-user] Any idea to avoid B frames? Date: Tue, 28 Aug 2007 11:59:30 +0200
On date Tuesday 2007-08-28 14:33:27 +0800, Wang Cg encoded:
Hi,all, When converting other formats to wmv format, I'd like to encode it with I frame and P frame,and not using B frame. How could I do with FFmpeg?
It's strange, because if I try to encode with wmv1 or wmv2 (WMV 3 encoder isn't supported) I get:
sds at santefisi ~/s/m/samples> ffmpeg -i input.mpeg -bf 5 -vcodec wmv2 -acodec wmav2 -f asf -y output.asf FFmpeg version SVN-r10230, Copyright (c) 2000-2007 Fabrice Bellard, et al. configuration: --prefix=/home/sds --mandir=/home/sds/share/man --enable-gpl --enable-pp --enable-libfaad --enable-libfaac --enable-libamr-nb --enable-libamr-wb --enable-x11grab --enable-libmp3lame libavutil version: 49.5.0 libavcodec version: 51.42.0 libavformat version: 51.12.2 built on Aug 26 2007 11:11:53, gcc: 4.1.2 20061028 (prerelease) (Debian 4.1.1-19) Input #0, mpeg, from 'aikido-orig.mpeg': Duration: 00:00:53.3, start: 0.500000, bitrate: 923 kb/s Stream #0.0[0x1e0]: Video: mpeg1video, yuv420p, 720x576, 104857 kb/s, 25.00 fps(r) Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, 64 kb/s Output #0, asf, to 'aikido-bf5.asf': Stream #0.0: Video: wmv2, yuv420p, 720x576, q=2-31, 200 kb/s, 25.00 fps(c) Stream #0.1: Audio: wmav2, 48000 Hz, stereo, 64 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 [wmv2 @ 0x84a9e48]b frames not supported by codec ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Error while opening codec for output stream #0.0 - maybe incorrect
Sorry,Stefana. I didn't describe my question clear. When I found B frames in MPEG, and something was wrong with it, so I thought the wmv had B frames too. Thx for your help! parameters such as bit_rate, rate, width or height
So even forcing the use of B frames (-bf option) I can't get B frame in the output stream.
How can you say there are B frames in the output stream?
Cheers. -- ffmpeg-user random tip #5 FF-mpeg documentation: http://ffmpeg.mplayerhq.hu/documentation.html _______________________________________________ ffmpeg-user mailing list ffmpeg-user at mplayerhq.hu http://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-user
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