[FFmpeg-devel] [PATCH] Change libvpx-vpx default to crf=32.

[Michael Niedermayer]

On Sun, Aug 25, 2019 at 04:43:31PM -0700, Elliott Karpilovsky wrote:
> Current default is 200kbps, which produces inconsistent
> results (too high for low-res, too low for hi-res). Use
> CRF instead, which will adapt. Affects vp8/vp9. Also
> have VP8 use a default bitrate of 256kbps.
> ---
>  libavcodec/libvpxenc.c | 71 +++++++++++++++++++++++++++++++++++-------
>  1 file changed, 60 insertions(+), 11 deletions(-)

breaks:
./ffmpeg -i mm.mpg  -vcodec libvpx-vp9 -lossless 1 -vframes 1 -an  vpx-lossless.mkv
...
[libvpx-vp9 @ 0x2ed9080] Neither bitrate nor constrained quality specified, using default CRF of 32
[libvpx-vp9 @ 0x2ed9080] CQ level 32 must be between minimum and maximum quantizer value (0-0)
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The greatest way to live with honor in this world is to be what we pretend
to be. -- Socrates
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