[MPlayer-matrox] Any way to run mplayer continuously for analog rebroadcasting?

[Brian Thompson]

Ok, audio is working again although the solution is ugly.
I copied ./libao2/ao_alsa.c from the mplayer-1.0pre7try2 source
tree to the CVS source tree and then recompiled the CVS version.
The output I'm now getting is the following and the audio works.

Building audio filter chain for 48000Hz/2ch/s16le -> 0Hz/0ch/??...
[libaf] Adding filter resample
[resample] Changing sample rate to 44100Hz
[resample] Using linear interpolation.
[resample] Using linear interpolation.
alsa-init: requested format: 44100 Hz, 2 channels, 9
alsa-init: compiled for ALSA-1.0.8
alsa-init: setup for 1/2 channel(s)
alsa-init: 1 soundcard found, using: default
alsa-init: pcm opend in block-mode
alsa-init: format s16le are not supported by hardware, trying default
alsa-init: unable to set format: Invalid argument
alsa-init: chunksize set to 1024
alsa-init: fragcount=16
alsa-init: got buffersize=65536
alsa: 44100 Hz/2 channels/4 bpf/65536 bytes buffer/Signed 16 bit Little 
Endian
AO: [alsa] 44100Hz 2ch s16le (2 bytes per sample)
AO: Description: ALSA-0.9.x-1.x audio output
AO: Author: Alex Beregszaszi, Zsolt Barat <joy at streamminister.de>
AO: Comment: under developement
Building audio filter chain for 48000Hz/2ch/s16le -> 44100Hz/2ch/s16le...
[resample] Using linear interpolation.
[resample] Using linear interpolation.
Starting playback...
alsa-space: free space = 65536, prepared --
[libaf] Reallocating memory in module resample, old len = 0, new len = 60212

-Brian


Brian Thompson wrote:

>
> Attila, thanks for the info. I'm trying to go in this direction but it 
> looks
> like the -fixed-vo and -idle flags are only available in the CVS version
> of mplayer and I've run into a new problem trying to use the CVS
> version of mplayer instead of mplayer-1.0pre7try2. I can't seem to get
> any audio from the CVS version. I've tried quite a few of the additional
> audio filter flags over the past several hours but nothing seems to help.
>
> I admit neither of the following outputs look perfect, but the first one
> (mplayer-1.0pre7try2) does work. I'm using "-ao alsa" with no additional
> audio parameters in both of the following cases. The sound card is a
> USB Edirol UA-25. Anyone have any idea what I might be doing wrong?
> Thanks in advance for any suggestions.
>
> With mplayer-1.0pre7try2 I get the following and audio works fine:
>
> Checking audio filter chain for 48000Hz/2ch/s16le -> 48000Hz/2ch/s16le...
> [libaf] Adding filter dummy
> [dummy] Was reinitialized: 48000Hz/2ch/s16le
> AF_pre: 48000Hz/2ch/s16le
> alsa-init: requested format: 48000 Hz, 2 channels, 9
> alsa-init: compiled for ALSA-1.0.8
> alsa-init: setup for 1/2 channel(s)
> alsa-init: 1 soundcard found, using: default
> alsa-init: pcm opend in block-mode
> alsa-init: format s16le are not supported by hardware, trying default
> alsa-init: unable to set format: Invalid argument
> alsa-init: chunksize set to 1024
> alsa-init: fragcount=16
> alsa-init: got buffersize=65536
> alsa: 44100 Hz/2 channels/4 bpf/65536 bytes buffer/Signed 16 bit 
> Little Endian
> AO: [alsa] 44100Hz 2ch s16le (2 bps)
> AO: Description: ALSA-0.9.x-1.x audio output
> AO: Author: Alex Beregszaszi, Zsolt Barat <joy at streamminister.de>
> AO: Comment: under developement
> Building audio filter chain for 48000Hz/2ch/s16le -> 44100Hz/2ch/s16le...
> [dummy] Was reinitialized: 48000Hz/2ch/s16le
> [libaf] Adding filter resample
> [resample] Changing sample rate to 44100Hz
> [resample] Changing sample rate to 44100Hz
> [resample] Using linear interpolation.
> [dummy] Was reinitialized: 48000Hz/2ch/s16le
> [resample] Using linear interpolation.
> Starting playback...
> alsa-space: free space = 65536, prepared --
> [libaf] Reallocating memory in module resample, old len = 0, new len = 
> 60212
>
>
> With the latest CVS version of mplayer I get the following and no audio:
>
> Building audio filter chain for 48000Hz/2ch/s16le -> 0Hz/0ch/??...
> [libaf] Adding filter dummy
> [dummy] Was reinitialized: 48000Hz/2ch/s16le
> [dummy] Was reinitialized: 48000Hz/2ch/s16le
> alsa-init: requested format: 48000 Hz, 2 channels, 9
> alsa-init: using ALSA 1.0.8
> alsa-init: setup for 1/2 channel(s)
> alsa-init: using device default
> alsa-init: pcm opend in blocking mode
> alsa-init: format s16le are not supported by hardware, trying default
> alsa-init: unable to set format: Invalid argument
> Could not open/initialize audio device -> no sound.
> Uninit audio filters...
> [libaf] Removing filter dummy
> Uninit audio: dmo
> Audio: no sound
> Freeing 0 unused audio chunks.
> Starting playback...
>
> -Brian
>
>
> Attila Kinali wrote:
>
>> On Tue, 09 May 2006 15:41:06 -0400
>> Brian Thompson <brian at eng.wayne.edu> wrote:
>>
>>  
>>
>>> It would be ideal if there was a way to keep mplayer from
>>> quiting at the end of an event and try to reopen the same
>>> stream,
>>>   
>>
>>
>> This can be done if you use -idle in combination with -fixed-vo
>> (I'm not sure whether -fixed-vo works correctly with (x)mga
>> as i cannot test it currently, if it doesn't let me know)
>>
>>  
>>
>>> preferably while the remaining buffer is still playing
>>> in order to avoid the loss of the first few seconds of the next
>>> event.   
>>
>>
>> This can be solved using -slave interface. See the documentation
>> of the loadfile command in DOCS/tech/slave.txt.
>> Though i'm not sure whether MPlayer starts to buffer a stream
>> while another is still running.
>>
>>  
>>
>>> If no content is available or while it's trying to reopen
>>> the URL and refill it's cache, the matrox card would output
>>> a blank/black tv-out image with proper sync.
>>>   
>>
>>
>> Hmm.. this is a bit more tricky. You'd have to manualy
>> insert a black image. Maybe using loadfile and a black
>> gif/jpeg could do the trick. Otherwise when using -fixed-vo
>> the last shown frame stays on, which is probably not what you want.
>>
>>  
>>
>>> Does such a "continuous mode" exist and I'm just not able
>>> to find it in the command line options, or is this something that
>>> can be requested for a future release?
>>>   
>>
>>
>> I think you can hack something together with the above suggestions.
>> If it doesn't help or you encounter other problems, please let me know.
>>
>>                 Attila Kinali
>>
>>  
>>
>
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