[PLUG-AV] Codecs for saved video.

[James Bromberger]

Hi all,

    ffmpeg -y -i IBM-HPC.dv -threads 0 -f webm -vcodec libvpx
    -deinterlace -g 120 -level 216 -profile 0 -qmax 51 -qmin 11
    -rc_lookahead 25 -rc_buf_aggressivity 0.95 -vb 400k -acodec
    libvorbis -aq 85 -ar 22050 -ac 1 IBM-HPC-400kbps-22khz.webm

...produced a 361 MB file.

Jason made an MP4 x264 file with:

    ffmpeg -i IBM-HPC.dv -deinterlace -g 120 -rc_lookahead 25  -profile
    0 -qmax 51 -qmin 11 -vb 394035 -acodec libvorbis -ab 96k -ac 1 -ar
    44100 -threads 0 -vcodec libvpx IBM-HPC.vp8-test1.mkv

And that came out at 275 MB (this is the 2nd video up on the web site).
While x264 is patented, Wikipedia says "/On August 26, 2010 MPEG LA
announced that H.264 encoded internet video that is free to end users
will never be charged for royalties/".

So unless anyone objects, then perhaps we should stick with x264 for the
moment... unless someone else wants to try some other params and try and
get better results?


Also, I noticed that int he first few seconds of the video, we have some
hiccups with the audio - almost sounds like the dvswitch host was not
fast enough to keep up with dvsource-file, dvswitch && ffmpeg2theora on
just 2 cores. Same audio artefacts are in both video encodes referenced
above.

  James


-- 
/Mobile:/ +61 422 166 708, /Email:/ james_AT_rcpt.to
PLUG President 2011: http//www.plug.org.au
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