Re: [LAD] Screencasting with JACK [SOLVED!]

On Thu, Aug 8, 2013 at 6:54 PM, J. Liles <malnourite(a)gmail.com> wrote: > > As some of you may recall, every time I've posted a demo video to LAD, > I've had to include a disclaimer excusing the poor quality due to a lack > of > functional screencasting tools. > > Well, it took a couple of weeks of hair pulling and many, many hours of > testing, but I finally arrived at a solution. > > Anyone who wants to create a screencast and record audio via JACK *in > perfect sync* must do the following: > > Get ffmpeg. Apply this patch to it: > > > https://github.com/original-male/FFmpeg/commit/d02509d04d396a98646ca81e9ba3… > > Build it with vorbis and h264 support. > > Then, start your favorite desktop environment. I use Xephyr for this. > > Have jack running (at -r 48000) > > Then run the following command: > > ffmpeg -fflags +genpts+igndts -f x11grab -vsync 0 -r 30 -s 1920x1080 -i > :${DISPLAY}.+0,0 -vcodec h264 -f jack -ac 2 -r:a 48000 -i screencast > -acodec pcm_s16le -r:v 30 -vsync 2 -async 1 -map 0:0,1,0 -map 1:0 > -preset > ultrafast -qp 0 "$FILE" > > Where DISPLAY is the number of your X11 display and FILE is the filename > for the screencast. I use a .mkv extension for the matroska container. > > Remember to connect the streams you want recorded to the 'screencast' > JACK > inputs! > > With this setup I'm able to record a full 30 FPS @ 1080P with audio in > perfect sync. Please share your results too. With some more evidence I > might have a good case to get ffmpeg to accept my patch. >

Forgot to mention, use at least these options when configuring ffmpeg: ./configure --enable-libx264 --enable-x11grab --enable-gpl --enable-libvorbis