[mythtv-users] Alsa Prealloc Query

[Jean-Yves Avenard]

On 16 December 2010 07:55, Zooka <mythtv at fitzy.org> wrote:
>> What kind of content were you trying to play? (sampling rate, sample
>> format (16, 24, 32 bits) and how many channels?
>
> This is the ffmpeg -i output.  Is this sufficient?
>
> Stream #0.1[0x433](eng): Audio: ac3, 48000 Hz, stereo, s16, 384 kb/s
>
>
>> If you could reproduce the original condition and run mythfrontend -v
>> audio and upload the log in pastebin.ca
>
> http://pastebin.ca/2020698
>

Interesting...

We asked for a 200ms length buffer, yet ALSA gives us 110ms.

To get 200ms of audio, we need:
48000 * 2 (channels) * 2 (bytes per channel) * .2 = 38400 bytes = 37kB.

So a 64kB buffer should be plenty.

I had made some assumptions on how ALSA worked, seems it's not the
case for everyone.. bugger..

JY