Interesting, I don't have that audio filter. Perhaps it isn't compiled into my build of mplayer (ubuntu 8.10, 1.0rc2-4.3.2) Do you have ffmpeg installed? It looks like that may be your problem. Kyle On Wed, Jan 28, 2009 at 9:00 AM, Floris <jkfloris@xxxxxx> wrote: > Is there a way to encode a file on the fly? > > I tried the -af lavcac3enc option in mplayer, but I get an error: > > $mplayer chan-id.wav -ao alsa:device=spdif -af lavcac3enc=1 > MPlayer dev-SVN-r26940 > CPU: Intel(R) Pentium(R) 4 CPU 3.60GHz (Family: 15, Model: 4, > Stepping: 3) > CPUflags: MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1 > Compiled with runtime CPU detection. > > Playing chan-id.wav. > Audio file file format detected. > > ========================================================================== > Opening audio decoder: [pcm] Uncompressed PCM audio decoder > AUDIO: 44100 Hz, 6 ch, s16le, 4233.6 kbit/100.00% (ratio: > 529200->529200) > Selected audio codec: [pcm] afm: pcm (Uncompressed PCM) > > ========================================================================== > Audio LAVC, couldn't find encoder for codec ac3. > [libaf] Couldn't create or open audio filter 'lavcac3enc' > Error at audio filter chain pre-init! > > but mplayer -af help will show lavac3enc > > ... > extrastereo : Extra stereo > lavcac3enc : runtime encode to ac3 using libavcodec > lavcresample : Sample frequency conversion using libavcodec > ... > > > Floris > > Kyle Husmann schreef: >> Floris, >> >> From what I understand, you can fit only 2 uncompressed audio channels >> over a spdif connection. In order to handle more channels, it must be >> compressed and then transferred as a data stream, like DTS or AC3. >> >> Kyle >> >> On Wed, Jan 28, 2009 at 7:51 AM, Floris <jkfloris@xxxxxx> wrote: >> >>> Maybe a simple question, but is it possible to >>> play a 6 channel wav file over a spdif connection? >>> >>> >>> $aplay -L >>> >>> ... >>> iec958:CARD=Audigy2,DEV=0 >>> Audigy 2 ZS [2001], ADC Capture/Standard PCM Playback >>> IEC958 (S/PDIF) Digital Audio Output >>> ... >>> >>> sample file >>> http://www.halfgaar.net/media/chan-id.zip >>> >>> $aplay -D iec958 chan-id.wav >>> Playing WAVE 'chan-id.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, >>> Channels 6 >>> aplay: set_params:923: Channels count non available >>> >>> $mplayer chan-id.wav -ao alsa:device=spdif -channels 6 >>> MPlayer dev-SVN-r26940 >>> CPU: Intel(R) Pentium(R) 4 CPU 3.60GHz (Family: 15, Model: 4, Stepping: 3) >>> CPUflags: MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1 >>> Compiled with runtime CPU detection. >>> >>> Playing chan-id.wav. >>> Audio file file format detected. >>> ========================================================================== >>> Opening audio decoder: [pcm] Uncompressed PCM audio decoder >>> AUDIO: 44100 Hz, 6 ch, s16le, 4233.6 kbit/100.00% (ratio: 529200->529200) >>> Selected audio codec: [pcm] afm: pcm (Uncompressed PCM) >>> ========================================================================== >>> AO: [alsa] 44100Hz 2ch s16le (2 bytes per sample) >>> Video: no video >>> Starting playback... >>> A: 6.2 (06.2) of 6.0 (06.0) 0.2% >>> >>> aplay refuse to play the file while mplayer downmix the file and will >>> only play the front left and right channels >>> >>> Any dts or dolby digital dvd will play fine with mplayer -ao >>> alsa:device=spdif -afm hwac3. >>> >>> floris >>> >>> >>> ------------------------------------------------------------------------------ >>> This SF.net email is sponsored by: >>> SourcForge Community >>> SourceForge wants to tell your story. >>> http://p.sf.net/sfu/sf-spreadtheword >>> _______________________________________________ >>> Alsa-user mailing list >>> Alsa-user@xxxxxxxxxxxxxxxxxxxxx >>> https://lists.sourceforge.net/lists/listinfo/alsa-user >>> >>> > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by: > SourcForge Community > SourceForge wants to tell your story. > http://p.sf.net/sfu/sf-spreadtheword > _______________________________________________ > Alsa-user mailing list > Alsa-user@xxxxxxxxxxxxxxxxxxxxx > https://lists.sourceforge.net/lists/listinfo/alsa-user > ------------------------------------------------------------------------------ This SF.net email is sponsored by: SourcForge Community SourceForge wants to tell your story. http://p.sf.net/sfu/sf-spreadtheword _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
