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Old 24th November 2009, 07:58 PM
daytooner Offline
Registered User
Join Date: Apr 2009
Posts: 232
FFMpeg v4l2 settings

I have searched all around for this, and am a bit frustrated.

How do I specify the input number for my capture card to ffmpeg's v4l2 driver?

My command line now is:
ffmpeg -y -f oss -i /dev/dsp1 -f ac3 -ac 2 -ar 48000 -f video4linux2 -r 29.97 -i /dev/video0 -vc 1 -tvstd NTSC /mnt/xfs/vhs.mpg

But I get nothing but static and snow in my output file.

With mencoder, I used:

tv:// -tv driver=v4l2:device=/dev/video0:input=1:adevice=/dev/dsp1 ...

But, unfortunately, mencoder has a big problem syncing audio and video. I have used ffmpeg to convert files from one format to another without the sync problems. So I also want to be able to capture video from my capture card.

So, again, in short, how do I specify the mencoder -tv option input=1 in ffmpeg?


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Old 24th November 2009, 08:06 PM
Camberwell Offline
Registered User
Join Date: Mar 2006
Location: Wallingford, Oxfordshire, UK
Age: 39
Posts: 295
hello there,

what you need to do is use the v4lctl command

it come with xawtv


yum install xawtv
v4lctl -c /dev/video0 setinput Composite1 (or Television or whichever)

see man v4lctl for a list of commands
do this after you started ffmpeg
Processor: Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz
Memory: 16GB
OpenGL Renderer: GeForce GTX 550 Ti/PCIe/SSE2
Operating System: Fedora release 20 (Heisenbug)
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capture input, ffmpeg, mencoder, sync, v4l2

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