I think you need to be looking at the -map: option for ffmpeg, although from the documentation I can't figure out exactly how to use it.
http://ffmpeg.sourceforge.net/ffmpeg-doc.html On Sun, 3 Jul 2005 14:28:21 +0100 Mike Ryan wrote: > Hi > > I use ffmpeg to transcode my dvb-t recordings to watch on a PSP and I'm in the > UK. Everything works fine apart from anything I record from Channel 4. For > some > reason, there is no sound when I play it back on the PSP. I believe the > problem > is that ffmpeg seems to think there's two sound channels - it's selecting the > primary one. Playback on MythTV is no problem. Here's a sample of the output > from > ffmpeg: > > ffmpeg version 0.4.9-pre1, build 4756, Copyright (c) 2000-2004 Fabrice Bellard > configuration: --enable-faac > built on Jun 17 2005 16:02:27, gcc: 3.4.3 20050227 (Red Hat 3.4.3-22.fc3) > Input #0, mpeg, from > '/mythtv/recordings/1008_20050630200000_20050630210000.nuv': > Duration: 00:59:55.1, start: 1697.474022, bitrate: 2893 kb/s > Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 704x576, 25.00 fps, 10000 > kb/s > Stream #0.1[0x1c1]: Audio: mp2, 48000 Hz, mono, 64 kb/s > Stream #0.2[0x1c0]: Audio: mp2, 48000 Hz, stereo, 192 kb/s > Output #0, psp, to '/mythtv/video/M4V10003.MP4': > Stream #0.0: Video: mpeg4, yuv420p, 320x240, 29.97 fps, q=2-31, 512 kb/s > Stream #0.1: Audio: aac, 24000 Hz, stereo, 32 kb/s > Stream mapping: > Stream #0.0 -> #0.0 > Stream #0.1 -> #0.1 > > For any other channel, the larger bitrate audio channel comes first, ie: > Input #0, mpeg, from > '/mythtv/recordings/1073_20050628191500_20050628195800.nuv': > Duration: 00:42:54.5, start: 16393.593167, bitrate: 3053 kb/s > Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 720x576, 25.00 fps, 15000 > kb/s > Stream #0.1[0x1c0]: Audio: mp2, 48000 Hz, stereo, 256 kb/s > Stream #0.2[0x1c1]: Audio: mp2, 48000 Hz, mono, 56 kb/s > > Any got any ideas how I either > 1: Tell ffmpeg to select the second audio input channel > or > 2: Get myth to record with the larger audio channel first (if this makes > sense) > > Thanks in advance for any help > > Regards > > Mike > _______________________________________________ > mythtv-users mailing list > [email protected] > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users -- Nick Rout
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