VP8 working fine

David Kuehling dvdkhlng at gmx.de
Mon Apr 25 08:44:30 EDT 2011


>>>>> "Lluís" == Lluís Batlle i Rossell <viriketo at gmail.com> writes:

> Hello, I've been trying coding in theora and in vp8 (both with mkv),
> and I've found that the VP8 decoding (in ffmpeg, not of libvpx) even
> takes less CPU than theora decoding. Both encoded with ffmpeg at '-v
> 6'.

Unfortunately there is no -v6 to set video quality for ffmpeg :(

According to documentation there is -crf to enable constant quality with
libvpx.  However testing it I'm not sure that this has any effect on
bitrate.  Looks like ffmpeg encodes with the target bitrate of 200
that's set by default.

Note that constant quality audio encoding with -acodec libvorbis is
possible using option -aq (maybe in range 0..100, 0 should be ok for
nanonote's speakers).

This is with latest ffmpeg from git, libvpx 0.9.6 and the ffmpeg patch:

http://webm.googlecode.com/files/ffmpeg-HEAD-VP8_param_mapping-6.tar.gz

Anyone made constant-quality encodes work?

David
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