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
>>
>>
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