Hi, 0n 06/11/[EMAIL PROTECTED]:58 Otto J. Makela told me:
> I've on occasion needed to re-encode the audio stream on a video file, for
> example when I've received DVB files which have incorrectly encoded audio
> (maybe just an audio glitch on a DVB transmission, different languages on
> right-left instead of on different tracks etc.)
>
> Back in pre-history I used to do video/audio stream demux, then
> % transcode -i stream.mp2 -x null,mp3 -n0x50 -y mp2enc -o stream-reencoded
> and then remux the video/audio stream back together.
>
> I came to think that it should be doable just with transcode (input whole mpeg
> file, write the raw video stream to new a file, re-encode the audio stream)
> and
> then mplex the separated video/audio streams back together. However, I don't
> seem to be able to get the right combination of input/output "raw" filters
> because I keep getting a huge YUV RIFF file as the video.
>
> When I just want to copy the mpeg video stream through unmolested, what's
> wrong
> with the following command line?
>
> % transcode -i stream.mpg -x mpeg2,mp3 -y raw,mp2enc -ext .m2v,.mp2 -o
> stream-reencoded
Manpage says raw(video)==RGB YUV YUV420
Never tried, but probably adding -P 1 to your command line will
work.
If all fail, I would use:
#!/bin/sh
transcode -i stream.mpg -x null,mp3 -y null,mp2enc -o /dev/null \
-m /tmp/audio.new
mplayer -dumpvideo -dumpfile /tmp/video.m2v stream.mpg
mplex -f 8 -o ./new_stream.mpg /tmp/audio.new /tmp/video.m2v
rm /tmp/audio.new /tmp/video.m2v stream.mpg
However, if you are short of HD, it won't help :(.
> Also, wasn't there a mechanism to call a multiplexer directly from transcode
> with the video/audio streams on named pipes, I couldn't locate info on the
> Wiki?
Dunno about such option either.
--
bye maik
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