On Wed, 29 Jun 2005, Trent Piepho wrote: > On Wed, 29 Jun 2005, Oliver Seufer wrote: > > > > 1. sox NAME.wav -t raw -x -s -w -c2 -r48000 NAME.lpcm > > > > 2. mplex -S 0 -f 8 -V -o NAME.mpg NAME.lpcm NAME.m2v > > > > It make no different if I also use "-L 48000:2:16" > > > > 3. Try to play this file with mplayer and xine. Video is OK, but Sound > > > > make just a noise. > > > > > > If you compare the bytes in NAME.wav and NAME.lpcm, are they > > > byte-swapped? (They should be). If not, then you should remove the -x > > > option to sox. > > The "-x" option of sox only swaps bytes if nessasary. I started my > > first test with just cutting of the wav header with dd. The resulting > > NAME.lpcm was the same. It is also the same if I don't use the "-x" > > option.o > > I think the question is, are you feeding mplex big-endian data or not? > > Try this: > > sox NAME.wav -t raw -x -s -w -c2 -r48000 NAME1.lpcm > sox NAME.wav -t raw -s -w -c2 -r48000 NAME2.lpcm > > hexdump NAME1.lpcm | head -1 > hexdump NAME2.lpcm | head -1 > > Are the two lpcm files byteswapped from each other? I tried this, and it > worked for me. > > ~$ hexdump foo.raw | head -1 > 0000000 c901 7101 7702 f801 8203 0203 c703 5303 > ~$ hexdump bar.raw | head -1 > 0000000 01c9 0171 0277 01f8 0382 0302 03c7 0353 > > In this case, one of these files will work, and one will not. Are you getting > both files the same? Or are you trying both with mplex and getting incorrect > sounding output from both?
I get the same results. Maybe my version of sox is broken: $ sox NAME.wav -t raw -x -s -w -c2 -r4800 NAME1.lpcm $ sox NAME.wav -t raw -s -w -c2 -r4800 NAME2.lpcm $ hexdump NAME1.lpcm | head -1 0000000 0071 ffee 00b9 ff4e 00ab fe86 00bc fed5 $ hexdump NAME2.lpcm | head -1 0000000 0071 ffee 00b9 ff4e 00ab fe86 00bc fed5 $ sox -V sox: Version 12.17.7 I now swapped the bytes myself and now the mpeg file is ok. Any suggestions for the best video rate with pcm audio? At the moment I use this mpeg2enc options: -M3 -a2 -q4 -f8 -b8192 -np -F3 -I1 -21 -41 -r16 -N1.0 -Khi-res -D10 -s -c -P But the burned result skips some video frames when playing it on a normal dvd player. Ton is ok. Greatings Oliver ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
