On 01/15/2011 01:54 AM, JÃrn Nettingsmeier wrote: > On 01/13/2011 12:59 PM, Robin Gareus wrote: >> On 01/13/2011 11:32 AM, JÃrn Nettingsmeier wrote: > >> You do realize that you can also just use raw PCM for audio on DVDs: >> 48 kHz or 96 kHz, 16 or 24 bit, 2-6 channels; but only up to 6144 kbit/s >> >>> better yet, i'd like to use five uncompressed pcm streams, and the >>> wikipedia article on dvd-video seems to indicate it's possible >> >> oh, you did realize :) >> >>> - has anyone done it >> >> stereo PCM: yes. 5chan: no > > i'll try it. does anyone have an idea what the format should be? channel > order? 1 2 3 4 5 :) - I don't know. IIRC 5.1 is L,R,C,LFE,LS,RS - but double check that. > interleaved? yes > sample rate? 48kSPS or 96kSPS > bit depth? signed 16 or 24 bits - big-endian The ffmpeg dvd-muxer is somewhat broken. It produces a lot of "packet too large" errors when muxing PCM into a mpeg/dvd container. Apparently one can fix that using ffmpeg's -packetsize -bufsize -muxrate options, but I never found out the right parameters for those. What works is using 'mplex' (from mjpeg-tools http://mjpeg.sf.net ) for doing the muxing. Here's a walk-though: 1) generate a raw PCM file of the audio - it needs to be signed big-endian and (re)name the file to end with .lpcm (mplex does recognize it by extension) - I used rezound but many tools can do that job. 2) generate a dummy video (black-frame or sth. 720x576) of the same length as (or longer than) the audio. I sym-linked a black_frame.png to bf_000.png, bf_001.png, bf_002.png and created a 5 min video with: ffmpeg -r 1/100 -i /tmp/bf_%03d.png \ -f mpeg2video -an -r 25 -aspect 4:3 /tmp/video.mpg 3) MUX the two together: (adjust the -L param to match the audio format. e.g. '-L 48000:5:24' for a 5 channel 24 bps file.) mplex -f 8 -o /tmp/dvdout.mpg -L 48000:2:16 \ /tmp/video.mpg \ /tmp/audio-pcm_s16be.lpcm 4) Master it: I whipped up a dvdauthor XML file and mastered it with dvdauthor -o /tmp/dvd/ -x /tmp/movie.xml mkisofs -dvd-video -o /tmp/dvd.iso /tmp/dvd/ You can use the 'devede' GUI to create dvdauthor XML files and create the ISO. Note: When adding a file with 'devede' check the Advanced->Misc->This file is already a DVD-suitable MPEG-PS file option. Otherwise 'devede' will transcode it again. 5) test it: ogle /tmp/dvd.iso Note: you may need to edit your ~/.oglerc and change the audio-driver from oss to alsa. - `man oglerc` explains how. It should be possible to put an audio-track without video on a DVD, 'mplex' accepts that, but I could not convince 'dvdauthor' to create a .vob from that. If you know or find out how, please let me know. HTH, robin -- Robin Gareus web: http://gareus.org/ mail: robin@xxxxxxxxxx lab: http://citu.fr/ chat: xmpp:rgareus@xxxxx Public Key at http://pgp.mit.edu/ http://gareus.org/public.asc Fingerprint : 7107 840B 4DC9 C948 076D 6359 7955 24F1 4F95 2B42 _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
