[PLUG-AV] IBM Talk video in WebM

[James Bromberger]

Hello all,
Weighing in at 685 MB, and running for 1 hour 40 minutes 11 seconds (so
around 114 KByte/sec), is the latest video from Tuesday's IBM talk in
the WebM format available at:

    *http://www.plug.org.au/video/2011/
    *


This was produced with:

    *ffmpeg  -i IBM-HPC.dv -acodec libvorbis -aq 6 -vcodec libvpx -b
    512k IBM-HPC.webm
    *


Now we should possibly reduce to mono audio encoding, and may be add
de-interlace.  This was produced on AV 2 in about 5 hours; we may be
able to do better with "-threads 2". I started a bash script to handle
this in ~av/Desktop/transcode-video-to-webm.sh, and saw a suggestion of:

    *ffmpeg -y -i $1 -threads 8 -f webm -aspect 16:9 -vcodec libvpx
    -deinterlace -g 120 -level 216 -profile 0 -qmax 42 -qmin 10
    -rc_buf_aggressivity 0.95 -vb 2M -acodec libvorbis -aq 90 -ac 2
    ${1%.dv}.webm
    *



AV 2 is up temporarily on IPv6 at av2.home.james.rcpt.to
(2001:470:f29c:0:21e:8cff:fea4:17b5) if someone wants to have a go at
other encodes?? Original DV Video files and transcodes are in
/storage/av/2011/IBM/; let me know if you're actively trying this so I
don't turn it off when sorting the shed on the weekend.

If no one wants to play with another encode, and everyone is happy with
this one, then we can tell the list its there....

  James


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