[mythtv-users] Recording Radio from STB

[Nick Morrott]

On 08/02/07, John Pilkington <J.Pilk at tesco.net> wrote:
> Nick Morrott wrote:
> > On 08/02/07, Robin Gilks <g8ecj at gilks.org> wrote:
> >> Greetings
> >>
> >> As I understand it, a DVB capture device can recognise a radio (no
> >> picture) source and record just the audio.
> >
> > It still creates a dummy video stream, which in my experience
> > recording from BBC-R4 usually comes out at the same size as the audio
> > stream (~50MB for a 30min recording).
> >
> >> I'm using a PVR150 to capture from an STB and there are a few radio
> >> channels I'm interested in. Is there a way to record these without the
> >> hours of still video frame? i.e. just the audio?
> >
> > Not that I am aware of for a hardware MPEG2 card. To keep filesizes
> > down I suppose you could create a special recording profile with very
> > low video bitrate so that total filesizes are as small as possible.
> >
> > I haven't tried using the 'recording type' setting and specifying
> > 'Audio only' with a PVR card either. I'm not sure how early in the
> > encoding process the audio and video streams are separate to allow
> > MythTV to access one or the other, or whether the ivtv driver passes
> > the already muxed stream encoded with the settings MythTV has passed
> > to the driver.
> >
> > Nick
>
> I replied to the original post, but my replies have apparently vanished.
>
> With my DVB-T (UK) recording profile set to 'normal' I see the same
> behaviour as Nick; in fact the profile seemed to make no difference
> (atrpms 0.21 'bleeding' build) and I could find no way of selecting
> anything other than the default.  It is usually possible to edit the
> recording but finding the right place to cut is tricky.
>

WRT audio-only channels, the key difference between the recording
types is that the 'TV only' profile expects to find at least one video
stream in the signal. This means that if you try to record DVB radio,
which contains only audio, the recording will fail. The 'Normal' and
'Audio Only' types should be suitable for recording audio channels
such as DVB radio.

Nick
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