[vdr] Re: ffmpeg errors with softdevice

[Dominique Dumont <domi.dumont@free.fr>]

Stefan Lucke <stefan@lucke.in-berlin.de> writes:

> I did a test with Suse 9.0 default kernel 2.4.21-192-default. So I no longer
> get those ffmpeg error messages. Picture comes up instantly and there
> are no delays on channel switches. So these problems are either kernel or
> dvb driver related (my other enviroment is kernel 2.4.27-pre5 with
> linuxtv-dvb-1.1.1 drivers).

I've run a test with kernel 2.6.7, vdr 1.3.12 softdevice 0.0.7pre1 and
alsa 1.0.5.

Looks like the problem is related to alsa: I get different behavior
depending on the audio device (changed by editing audio.c):

* with plughw:1,0 (line out of Nforce2 chip, snd-intel8x0, 44100Hz): I
  get choppy sound and video on startup and when switching
  channels. After I block vdr for a few second I get normal sound and
  video. The only hitch is that the audio is out of sync by about 1/3
  or 1/2 of a second.

* with plughw:1,2 (spdif out of Nforce2 chip, snd-intel8x0, 48000Hz):
  Almost no problem on startup or when switching channels. Audio is
  also late like above. I sometimes get 'xrun' message in syslog. No
  ffmpeg errors messages.

* with plughw:0,0 (line out of SBlive 5.1): I have not figured out how
  to make it work with alsaplayer, so I got no sound with vdr. But
  softdevice does open alsa driver and works fine (no choppy video nor
  errors message from ffmpeg)

* with plughw:0,3 (spdif out of SBlive 5.1, snd_emu10k1, 48000Hz):
  Almost no problem on startup or when switching channels. Audio has
  severe distortion. I did not test for very long lest I blow up my
  tweeters.

Note that plughw:0,3 output works fine with mplayer.

Is there any other test I can do to help ?

Cheers