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:

not fail the whole decoder, just remove the encodings that fail the self tests
find out why it fails and fix it!
re-enable YUV444 (lower priority)

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

priority changed from blocker to major
status changed from new to assigned

r9786 allows the dec_avcodec2 to continue decoding other video encodings and only disables the one that fails
testing all the versions I have for Fedora 22:
- 2.7.3 is ok
- 2.6.3 is ok
- 2.4.7 fails:

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

2.6.1 is ok

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

status changed from assigned to closed
resolution set to fixed

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

libavcodec version (56, 1, 100) is too old: disabling VP9 for versions older than 2.6.x (56, 26, 100)
libavcodec version (56, 1, 100) is too old: disabling VP9 YUV444P support for versions older than 2.7.x (56, 41, 100)

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