Re: Org-mode screencasts

[Russell Adams <RLAdams@AdamsInfoServ.Com>]

On Thu, Sep 23, 2010 at 12:21:14PM -0400, Richard Moreland wrote:
> I've just installed and tested "recordmydesktop" (based on Russell's
> recommendation) on my Linux system and it seems to work great.  It
> produces .ogv video files, which will need to be run through ffmpeg or
> mencode first to be compatible with Vimeo.

To update this topic:

I've been recording a screencast for setting up a functional Org-mode
installation in Windows (I'll post about this separately), and wanted
to share the tools I'm using.

I did use recordmydesktop, and the Ogg Theora files it outputs had
some minor time synchronization issues. Nothing major, it "catches up"
frequently, but not real time keystroke capture. It runs in spurts.

I used Kdenlive to stitch together multiple segments, and found it to
be an excellent product, with terrible Ogg Theora support. To save
some time for the next person, here's what I did.

I took my .ogv's and transcoded them to .mov using ffmpeg, and split
the audio out to a separate wav file. Then Kdenlive used the .mov and
.wav in parallel tracks for rendering.

for X in *.ogv ; do ffmpeg -i $X -vn -acodec pcm_s16le -ar 22050 -ac 1
`basename $X .ogv`.wav ; done

for X in *.ogv ; do ffmpeg -i $X -an `basename $X .ogv`.mov ; done

After learning a bit on audio and video fades, Kden's rendering was
great. Always use at least a short audio fade in and out to prevent
clicks when changing tracks.

Next time I may use ffmpeg directly to record to avoid Theora, though
I think I'll continue to use my bluetooth headset with pulseaudio.

Thanks.

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Russell Adams                            RLAdams@AdamsInfoServ.com

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