Hallo, I think there has to be a bug in the mplex tool with lpcm. That is what I have done:
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. Now I tried to figure out what the problem is: 1. mplayer -dump NAME.mpg result: stream.dump is the same as NAME.lpcm 2. mplayer -ao pcm:file=stream.wav NAME.mpg result: stream.wav difference NAME.wav Now let us compare the beginning of the files with hexdump: hexdump -C NAME.wav | head -n 5 00000000 52 49 46 46 24 ea 12 21 57 41 56 45 66 6d 74 20 |RIFF$..!WAVEfmt | 00000010 10 00 00 00 01 00 02 00 80 bb 00 00 00 ee 02 00 |................| 00000020 04 00 10 00 64 61 74 61 00 ea 12 21 de 00 c4 ff |....data...!....| 00000030 dd 00 c4 ff e9 00 c0 ff d1 00 c8 ff c9 00 d0 ff |................| 00000040 c2 00 b6 ff b9 00 de ff 88 00 b0 ff 96 00 64 ff |..............d.| hexdump -C stream.wav | head -n 5 00000000 52 49 46 46 24 ea 12 21 57 41 56 45 66 6d 74 20 |RIFF$..!WAVEfmt | 00000010 10 00 00 00 01 00 02 00 80 bb 00 00 00 ee 02 00 |................| 00000020 04 00 10 00 64 61 74 61 00 ea 12 21 00 de ff c4 |....data...!....| 00000030 00 dd ff c4 00 e9 ff c0 00 d1 ff c8 00 c9 ff d0 |................| 00000040 00 c2 ff b6 00 b9 ff de 00 88 ff b0 00 96 ff 64 |...............d| As you can see the byte order of the audio data is swapped after the end of the wave header. You can now think this is a bug with mplayer or xine, but a 'real' DVD with lpcm audio has not this problem. I now tried to see what the difference is: 1. mplayer -dump VTS_01_1.VOB 2. sox -t raw -x -s -w -c2 -r48000 stream.dump stream_convert.wav 3. mplayer -ao pcm:file=stream.wav VTS_01_1.VOB hexdump -C stream.wav | head -n 10 00000000 52 49 46 46 24 00 e5 0e 57 41 56 45 66 6d 74 20 |RIFF$...WAVEfmt | 00000010 10 00 00 00 01 00 02 00 80 bb 00 00 00 ee 02 00 |................| 00000020 04 00 10 00 64 61 74 61 00 00 e5 0e 00 00 00 00 |....data........| 00000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 0000bfd0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 00 |................| 0000bfe0 ff ff 00 00 00 00 01 00 ff ff 01 00 ff ff 00 00 |................| 0000bff0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 0000c020 00 00 00 00 00 00 00 00 00 00 00 00 01 00 ff ff |................| hexdump -C stream_convert.wav | head -n 10 00000000 52 49 46 46 6c 61 e5 0e 57 41 56 45 66 6d 74 20 |RIFFla..WAVEfmt | 00000010 10 00 00 00 01 00 02 00 80 bb 00 00 00 ee 02 00 |................| 00000020 04 00 10 00 64 61 74 61 48 61 e5 0e 00 00 00 00 |....dataHa......| 00000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 0000bfd0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 |................| 0000bfe0 ff ff 00 00 00 00 00 01 ff ff 00 01 ff ff 00 00 |................| 0000bff0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 0000c020 00 00 00 00 00 00 00 00 00 00 00 00 00 01 ff ff |................| As you can the the byte order is the same. Mplayer says for both files: Trying to force audio codec driver family libmad... Opening audio decoder: [dvdpcm] Uncompressed DVD/VOB LPCM audio decoder AUDIO: 48000 Hz, 2 ch, s16be, 1536.0 kbit/100.00% (ratio: 192000->192000) Selected audio codec: [dvdpcm] afm:dvdpcm (Uncompressed DVD/VOB LPCM) When you need any further information to track down then problem please contact me. I tried version mjpegtools-1.6.2 and mjpegtools-1.6.3-rc1. Both have this problem. After searching in mail archive I found: -W mplayer_hdr But this options results only in a segfault. Kind regards Oliver Seufer ------------------------------------------------------- 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
