Xpra: Ticket #905: newer libav versions fail to decode vp9

Which is a big problem since that makes us fail the whole dec_avcodec2 module, which means no h264 decoding... Note: vp9 + YUV444 was already broken before, which is why it is disabled in the code.

We need to:

Wed, 01 Jul 2015 14:55:50 GMT - Antoine Martin: priority, status changed

dec_avcodec.Decoder({...}).decompress_image(<type 'str'>:45, {}) avcodec_decode_video2 failed to decode the stream

So I am lowering the priority: we've been shipping ffmpeg>=2.6 for a while now.

Wed, 01 Jul 2015 16:07:48 GMT - Antoine Martin: status changed; resolution set

Re-enabled VP9+YUV444P decoding in r9789 and added some warnings when older versions of ffmpeg are found:

This will do, users hitting the messages should know what to do.

Sat, 23 Jan 2021 05:09:23 GMT - migration script:

this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/905