[Cin] offtopic: Digitize and record Video with A/D USB adapters

Dominique Michel dominique.c.michel at gmail.com
Mon Oct 11 22:28:31 CEST 2021

Le Mon, 11 Oct 2021 18:41:35 +0200,
"Terje J. Hanssen via Cin" <cin at lists.cinelerra-gg.org> a écrit :

> Mat and all
> I take a follow-up included below:
> Den 25.09.2021 20:47, skrev mnieuw--- via Cin:
> > Hi Terje,
> > I have used a cheap chinese USB video grabber to digitise VHS. But I
> > cannot remember the type.
> > I used VLC, which worked fine, but OBS should also work. I had
> > loaned the grabber, and have not tested if Cinelerra-GG could use
> > it directly. I cannot remember if video and audio showed up as two
> > different devices or not. If the audio is not a separate device,
> > then I doubt Audacity can record with it.

On linux, you can use mencoder to grab audio + video and specify
any video input and output file and format you want to use. It is much
more easier to use than ffmpeg. Something like:

SVID="2" # the input on the video device
ALSA_SVID="hw.1" # the ALSA card
RATE="48000" # [Hz] same than the sound card for best quality
WIDTH="634" # must be divisible by 16
HEIGHT="472" # must be divisible by 16
VRATE="4500" # [kbits] between 4 (small file) and 16000 (big file)
CROPED_WIDTH="628" # must be divisible by 16 or 4
CROPED_HEIGHT="448" # must be divisible by 16 or 4

mencoder tv:// -tv
-mc 0 -noskip -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=$VRATE -vf
mp3lame -lameopts cbr:br=64 -o $F_SV_REC"

For the video quality of VHS, if the player or the video camera have a
s-video output, and the video card a s-video input, the final record will
be better than with "standard" VHS quality. 


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