Re: [LINUX_Newbies] ffmpeg x11grab flag?

 

On Fri, Jul 01, 2016 at 05:04:34PM -0400, Scott scottro@nyc.rr.com [LINUX_Newbies] wrote:
> On Fri, Jul 01, 2016 at 04:36:33PM -0400, Hal halinux@frontier.com [LINUX_Newbies] wrote:
> > Greetings: Trying ffmpeg's x11grab feature works well except for one issue;
> > at least to me:
> >
> > The grabbed copy of a YouTube video is good except the picture quality that
> > appears as a mozaic of little squares; if that's the right description..
> >
> > The reason for trying ffmpeg is that using youtube-dl d/l'd a good copy of
> > the video but would not copy the embedded captions.. :^(..
> >
>
> I haven't been able to duplicate your problem. I use something like
>
> ffmpg -s 1366x768 -f x11grab -i $DISPLAY -f alsa -i default output.mkv
>
> (I get the 1366x768 from xrandr)

Thanks Scott for your reply; my script is basically the same as yours:

ffmpeg -f x11grab -s 1280x1024 -r 29.97 -i :0.0 grab.mp4

Playing around with the parameters changed little as far as the pixelation..
I fitted a PCIe video card instead of the on board and it may have helped;
but little.. I think the video information grabbed is before the cards input
though..

> However, if it's defintely giving that pixelation you're describing,
> there's a few options. I don't know much about youtube uploading, so not
> sure why youtube-dl wouldn't get the captions, whenever I've used it, say,
> with anime, I've bee able to get my captions.

I see that "captions" means many things; embedded or separate tracks, etc..
So much to learn.. I, also, note that other "grab" programs don't print the
captions with the quality good, otherwise.. I suspect almost all of them
use ffmpeg as the backend..

> Also, are you using the latest youtube-dl, that is, going to their site and
> downloading it, or the one provided by your distribution? Sometimes, those
> will be older versions and not work as well.

Latest version I could find; didn't try older ones..

I have another issue with the 4kvideodownloader.com tarball that I bought
and should list separately..

Thanks again..

--

Hal..

GNU-Linux/UNIX - Slackware 14.1 JFS X86

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Posted by: Hal <halinux@frontier.com>

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