[PD] [OT]: Screencasts on Linux Debian with Jack and ffmpeg - [WAS] Re: data structure setsize allocation

[Antonio Roberts]

I use SImpleScreenRecorder http://www.maartenbaert.be/simplescreenrecorder/

It plays nicely with Jack and can record on-the-fly in high quality.

On 16 November 2014 22:16, Lorenzo Sutton <lorenzofsutton at gmail.com> wrote:
> On 12/11/14 04:06, Jonathan Wilkes via Pd-list wrote:
>>
>> Sure... what do people use in Debian/Ubuntu to do screencast + audio?
>>
>
> With Jack I use someting like this:
>
> ffmpeg -f jack -ac 2 -i ffmpeg -f x11grab -r 25 -s 1366x768 \
> -i :0.0 -acodec pcm_s16le -threads 0 output.mkv
>
> Notice that:
>
> - ffmpeg in my case is the 'original' one compiled by hand. Unfortunately
> debian now seems to only package avconv and that has always crashed on me
> with jack as audio input. However ffmpeg is relatively easy to compile on
> debian following this guide:
>
> https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu
>
> - You should play with the -s and -i parameters to suit your needs.
>
> - Pulseaudio will be automatically suspended when you run jack (I was forced
> to install it to use skype with, alas, I'm forced to use for work).
>
> - Clearly when screen-casting it'll be difficult to get Chuck Norris low
> latencies without some xruns.
>
> - The output with that ffmpeg command will be a very good quality mkv video
> however it will also be very (very!) big and you'll have to factor in the
> extra time for re-compressing (it's possible to encode on the fly -but I
> prefer to have a good quality 'original')
> For encoding I've had rather nice results with using webem, for example
> (YMMV):
>
> ffmpeg -y -i "$INFILE" -threads 8 -f webm -vcodec libvpx -g 120 \
> -level 216 -profile 0 -qmax 42 -qmin 10 -rc_buf_aggressivity 0.95 \
> -vb 2M -acodec libvorbis -aq 90 -ac 2 $OUTFILE
>
> Hope this helps.
> Lorenzo.
>
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