Jim Lesurf wrote:
In article , Andy Furniss
wrote:
Jim Lesurf wrote:
I've added the digital-tv group to this as someone there may be able
to clear up points I'm not sure about!...



How did you tune the EZCap and tell it which 'station' you wanted?

I think the ezcap is just analogue input - there's probably a way to
select between s-video and composite unless it only takes one at a time.

There is no tuning - it doesn't have a tuner.

I guess it just outputs yuv + pcm and lossless compresses it, sends it
over over usb and the specific v4l driver decompresses it and presents
yuv and pcm.

To summarise what has 'gone before' on the Linux and audio groups...

Davey has been trying to get audio output from the EZCap via ALSA. The
'arecord -l' command does seem to list what he says is the EZCap. But
attempts to read in the audio and capture it give either errors or an
all-zero-sample-values recording.

I wouldn't expect that to work without having the v4l drivers setup and
running the device.


I've been over the basic ways to determine the device ID under ALSA and how
to connect. But it seems not to co-operate. So I've been wondering about
the cause of the problem. In particular if it isn't really providing a
fully demodulated audio output.

Unlikely - but even if it were you would hear/record something.


Thought this because the FUNcube I'm using does output over ALSA, but the
output is IQ samples *not* audio, so need post-processing. In an earlier
posting Davey said his Windows software for the EZCap gave mpg output...

The windows software will probably (badly) convert to mpeg on the fly
because it's not practical to save as raw video. Of course it's possible
the device has a hardware encoder - but more likely not.

Some probing with v4l-ctl should give more info.

Hence I'm currently trying to decide if his working on having EZCap output
audio (without some further processing on the computer) is chasing a
boojum. So not an 'alsa' problem at all. But I dunno as I know zero about
the EZCap. My experience is only with the 290e and FUNcube.

Looking at Johns' post it seems that ezcap will work with VLC - I think
getting this to work should be the first thing, and also not testing
initially with a rare format like NTSC 443.