10bit mkv videos black video

[leszek]

10bit mkv h264 videos will playback but only show a black video output in media player. See sample file from here: ​http://ps-auxw.de/10bit-h264-sample/10bit-eldorado.mkv

The output I get is (on alpha 4):

~/Desktop> MediaPlayer 10bit-eldorado.mkv 
open playlist item: 10bit-eldorado.mkv
Compiler did not align stack variables. Libavcodec has been miscompiled
and may be very slow or crash. This is not a bug in libavcodec,
but in the compiler. You may try recompiling using gcc >= 4.2.
Do not report crashes to FFmpeg developers.
No BE API colorspace definition for pixel format "(unknown)".
CPU is capable of running MMX SSE1 SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 
resolve_colorspace: PIX_FMT_NONE => B_YCbCr422: NULL
BMediaEventLooper: SchedulingLatency is 750
BMediaEventLooper: SchedulingLatency is 3000
VideoConsumer::CreateBuffers - ERROR CREATING VIDEO RING BUFFER (Index 0 Width 608 Height 480 Colorspace 16384: Out of memory
VideoConsumer::Connected - COULDN'T CREATE BUFFERS
BMediaRoster::Connect: aborting after BBufferConsumer::Connected, status = 0x80000000
VideoProducer::Connect() - consumer error: Out of memory
BMediaRoster::Connect: aborted
Can't connect the video source to the video window... trying without overlays, error: Out of memory
NodeManager::_SetupVideoNodes() - falling back to B_RGB32
BMediaRoster::Connect connection established!
running without audio node
BMediaRoster::ReleaseNode, trying to release reference counting disabled timesource, node 1, port 282, team 8067
CPU is capable of running MMX SSE1 SSE2 SSE3 SSSE3 SSE4.1 SSE4.2 
resolve_colorspace: PIX_FMT_NONE => B_RGB32: NULL

[pulkomandy]

So, this is not related to mkv (which is only a container) but to the format used inside it. In the case of the attached video this is h264 using the "high 10" profile, which is decoded with a pixel format of yuv420p10le. This means:

• It is an YUV format
• There are 4 Y samples for one U and V (in a 2x2 grid)
• It is planar: all Y data comes first, followed by U, then V
• Each sample is stored on 10 bits (but it seems this is padded to 16-bits?)
• The bytes are in little endian order

​http://msdn.microsoft.com/en-us/library/windows/desktop/bb970578(v=vs.85).aspx

There is not (yet) a colorspace in Haiku matching this, and there is also not yet a converter to RGB32.

[pulkomandy]

Implemented in hrev48484. The sample file has some problem on first play because the initial frame is not properly decoded, but stopping MediaPlayer and pressing Play again makes it work.