ffmpeg doesn't record sound from WinTV.

Jacob Meuser jakemsr at jakemsr.com
Fri Dec 30 03:44:27 PST 2005


On Fri, Dec 30, 2005 at 10:57:29AM +0000, Steve O'Hara-Smith wrote:
> On Thu, 29 Dec 2005 20:24:04 -0800
> Jacob Meuser <jakemsr at jakemsr.com> wrote:
> 
> > On Thu, Dec 29, 2005 at 01:39:21PM +0100, Frank J. Beckmann wrote:
> > > Moin,
> 
> > > ffmpeg records sound from outher devices. So I guess that it doesn't tell the 
> >                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > > TV card to send the audio stream to it's line out. ffmpeg has the only really 
> >   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > 
> > no, bktr(4) always does that.  it is only possible to select the inputs.
> > all outputs are enabled when the tuner is unmuted (which happens by default
> > when the tuner is open()'d).
> 
> 	Yes that should be the case - but ffmpeg will emit an error message
> if opening the tuner fails and that error message is not present.
> 
> > do you hear audio when you run the above ffmpeg command?  if so, then the
> > problem is solely with the audio grabbing, not bktr.  make sure your mixer
> > is set right.
> 
> 	The mixer settings originally posted look correct to me (assuming
> the plug really is in line and not line1 or something silly like that).

yup, missed that.

only other things I can think of, are a) make sure the soundcard supports
recording of 48kHz 16-bit stereo (again, would probably see an error
message if not) and b) check that ac3 encoding actually works in that
version of ffmpeg (and that whatever is playing it back supports ac3
decoding).  otherwise, maybe try changing audio parameters.

still, though, if you hear sound when you run the ffmpeg command, the
problem is not in bktr, but audio.  bktr just sends audio to the
soundcard.  you don't record audio from bktr, but from the soundcard.

-- 
<jakemsr at jakemsr.com>

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