Re: [LAU] live video switching? WAS: Re: VJ / VeeJing software alternatives

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To: Len Ovens <len@...>
Cc: <linux-audio-user@...>
Date: Monday, July 21, 2014 - 9:25 am

On 07/21/2014 06:33 AM, Len Ovens wrote:

Hi Len,

That's just the usb stack detecting a device and reading the IDs. It
does not load a driver to handle it.

> Anything I can find suggests using a screen reader to get the live video

screen reader? that sounds odd. A Video-Loopback can work:
http://chdk.setepontos.com/index.php?topic=4672.0 suggests

$ sudo modprobe vloopback
$ V4L_DEVNAME=/dev/video0 canon-capture
capture> start
capture> v4l on

It looks like the canon camera is not supported by the v4l2 driver.

> (even for windows or mac)

The built-in webcam on a macbook (running Linux) works OOTB with
dvsource-v4l2-dv as does a cheap external USB webcam that I have (which
just shows up as /dev/video) both also produce audio-feeds.

For the real-thing(TM) I use firewire and camcorders or cameras.

> Sounds silly. Am I missing something? There is no audio that way.

Use a proper microphone, soundcard and `dvsource-jack` :)

Though in our case we ended up using the audio from the first camera:

Mics -> mixing-desk -> XLR -> camera 1 in.

That way the audio was always in sync (thanks for firewire
iso-synchroneous streams). dvsource-jack has options to calibrate
latency, and align the A/V but it may drift when streaming over long
periods of time if the soundcard is not word-clock synced with the camera.

HTH,
robin

PS. For testing dvsource-file comes in handy for testing.
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Messages in current thread:
[LAU] VJ / VeeJing software alternatives, Carlos sanchiavedraz, (Fri Jul 18, 10:55 am)
Re: [LAU] VJ / VeeJing software alternatives, Neil C Smith, (Fri Jul 18, 9:23 pm)
Re: [LAU] VJ / VeeJing software alternatives, Carlos sanchiavedraz, (Sat Jul 19, 11:34 am)
Re: [LAU] live video switching? WAS: Re: VJ / VeeJing softwa..., Robin Gareus, (Mon Jul 21, 9:25 am)
Re: [LAU] [Bulk] Re: live video switching? WAS: Re: VJ / Vee..., Daniel Roviriego, (Sun Jul 20, 11:45 pm)
[LAU] VJ / VeeJing software alternatives, David Adler, (Fri Jul 18, 11:59 am)
Re: [LAU] VJ / VeeJing software alternatives, Carlos sanchiavedraz, (Fri Jul 18, 5:12 pm)
Re: [LAU] VJ / VeeJing software alternatives, Harry van Haaren, (Fri Jul 18, 10:06 pm)
Re: [LAU] VJ / VeeJing software alternatives, Florent Berthaut, (Fri Jul 18, 11:21 am)
Re: [LAU] VJ / VeeJing software alternatives, Carlos sanchiavedraz, (Fri Jul 18, 5:23 pm)
Re: [LAU] VJ / VeeJing software alternatives, Florent Berthaut, (Sat Jul 19, 11:13 am)
Re: [LAU] VJ / VeeJing software alternatives, Carlos sanchiavedraz, (Sat Jul 19, 11:48 am)
Re: [LAU] VJ / VeeJing software alternatives, Carlos sanchiavedraz, (Fri Jul 18, 5:05 pm)