[FFmpeg-devel] Sponsoring feature for H.264 decoding with scaling factor (1/2, 1/4...) (if possible)

Michael Niedermayer michael at niedermayer.cc
Fri Jun 17 19:16:12 CEST 2016

On Fri, Jun 17, 2016 at 05:39:23PM +0200, Eric Beuque wrote:
> Hi,
> i'm posting here for a feature that is missing in ffmpeg (or may be i
> missed something), which consist of decoding H.264 frame with a scaling
> factor of 1/2, 1/4, 1/8...
> I found the parameter lowres, which works well with MJPEG stream but it's
> not working with the H.264 decoder.
> I don't know if it's something possible to implement in the decoder, but if
> yes, my compagny agreed to sponsor the feature (depending on the cost of
> course), if a developer qualified is interested to do it.
> Is someone know if it is possible, and if it can exist someone interested
> to develop this feature?

is it acceptable if the encoder enforces some restrictions on the used
features ?

most general h264 likely cannot efficiently be decoded in lower
resolution with acceptable quality
Restricting the used intra modes may make it possible to do it though
i dont know what the quality would be but better than without


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

In fact, the RIAA has been known to suggest that students drop out
of college or go to community college in order to be able to afford
settlements. -- The RIAA
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