[Libav-user] HEVC 2/3 of the frame is green

[Michael Wood]

Hi,

I'm having a weird issue with the decoding of *H265* *4K stream* where 1/3
of the frame is rendered normally and the other 2/3 is in green (
https://ibb.co/C8yFygm). This only happens if i try to decode *4K* stream,
for non *4K* streams everything works as expected.

I'm using *live555* library to get stream from *RTSP* server after which
packets are sent to the *ffmpeg* to be decoded and later rendered

*DESCRIBE* response contains all required *VPS,SPS,PPS* fields that are
passed as extra data to the codec context.

This is what is returned from *DESCRIBE*:

v=0
o=- 1679598602413481 1679598602413481 IN IP4 192.168.1.212
s=Media Presentation
e=NONE
b=AS:5050
t=0 0
a=control:rtsp://
192.168.1.212/Streaming/Channels/101/?transportmode=unicast&profile=Profile_1
m=video 0 RTP/AVP 96
c=IN IP4 0.0.0.0
b=AS:5000
a=recvonly
a=x-dimensions:3840,2160
a=control:rtsp://
192.168.1.212/Streaming/Channels/101/trackID=1?transportmode=unicast&profile=Profile_1
a=rtpmap:96 H265/90000
a=fmtp:96 sprop-vps=QAEMA///AWAAAAMAgAAAAwAAAwCWAAC94Eg=;
sprop-sps=QgEDAWAAAAMAgAAAAwAAAwCWAACgAeAgAhx/jb33am7uS/YC3AQEBBAAAD6AAALuByHe5RAAmRgACsPgAEyMAAVh8EACZGAAKw+AATIwABWHwg==;
sprop-pps=RAHBcrCcCgFGZA==
a=Media_header:MEDIAINFO=494D4B48010300000400050000000000000000000000000081000000000000000000000000000000;
a=appversion:1.0

When trying to decode packets i'm getting this output from hevc, the
*ffplay/VLC* works normally with the incoming stream.

[hevc @ 0x14ac15600] nal_unit_type: 32(VPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x14ac15600] nal_unit_type: 33(SPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x14ac15600] nal_unit_type: 34(PPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x14ac15600] Decoding VPS
[hevc @ 0x14ac15600] Main profile bitstream
[hevc @ 0x14ac15600] Decoding SPS
[hevc @ 0x14ac15600] Main profile bitstream
[hevc @ 0x14ac15600] Decoding VUI
[hevc @ 0x14ac15600] Decoding PPS
[hevc @ 0x14ac15600] nal_unit_type: 32(VPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x14ac15600] Decoding VPS
[hevc @ 0x14ac15600] Main profile bitstream
[hevc @ 0x14ac15600] nal_unit_type: 33(SPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x14ac15600] Decoding SPS
[hevc @ 0x14ac15600] Main profile bitstream
[hevc @ 0x14ac15600] Decoding VUI
[hevc @ 0x14ac15600] nal_unit_type: 34(PPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x14ac15600] Decoding PPS
[hevc @ 0x14ac15600] nal_unit_type: 19(IDR_W_RADL), nuh_layer_id: 0,
temporal_id: 0
[hevc @ 0x14ac15600] Format yuvj420p chosen by get_format().
[hevc @ 0x14ac15600] Output frame with POC 0.
[hevc @ 0x14ac15600] nal_unit_type: 19(IDR_W_RADL), nuh_layer_id: 0,
temporal_id: 0
[hevc @ 0x14ac15600] First slice in a frame missing.
[hevc @ 0x14ac15600] nal_unit_type: 19(IDR_W_RADL), nuh_layer_id: 0,
temporal_id: 0
[hevc @ 0x14ac15600] First slice in a frame missing.
[hevc @ 0x14ac15600] nal_unit_type: 32(VPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x14ac15600] Decoding VPS
[hevc @ 0x14ac15600] Main profile bitstream
[hevc @ 0x14ac15600] nal_unit_type: 33(SPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x14ac15600] Decoding SPS
[hevc @ 0x14ac15600] Main profile bitstream
[hevc @ 0x14ac15600] Decoding VUI
[hevc @ 0x14ac15600] nal_unit_type: 34(PPS), nuh_layer_id: 0, temporal_id: 0
[hevc @ 0x14ac15600] Decoding PPS
[hevc @ 0x14ac15600] nal_unit_type: 19(IDR_W_RADL), nuh_layer_id: 0,
temporal_id: 0
[hevc @ 0x14ac15600] Output frame with POC 0.
[hevc @ 0x14ac15600] nal_unit_type: 19(IDR_W_RADL), nuh_layer_id: 0,
temporal_id: 0
[hevc @ 0x14ac15600] First slice in a frame missing.
[hevc @ 0x14ac15600] nal_unit_type: 19(IDR_W_RADL), nuh_layer_id: 0,
temporal_id: 0
[hevc @ 0x14ac15600] First slice in a frame missing.
[hevc @ 0x14ac15600] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0,
temporal_id: 2
[hevc @ 0x14ac15600] Output frame with POC 1.
[hevc @ 0x14ac15600] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0,
temporal_id: 2
[hevc @ 0x14ac15600] First slice in a frame missing.
[hevc @ 0x14ac15600] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0,
temporal_id: 2
[hevc @ 0x14ac15600] First slice in a frame missing.
[hevc @ 0x14ac15600] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0,
temporal_id: 2
[hevc @ 0x14ac15600] Output frame with POC 2.
[hevc @ 0x14ac15600] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0,
temporal_id: 2
[hevc @ 0x14ac15600] First slice in a frame missing.
[hevc @ 0x14ac15600] nal_unit_type: 1(TRAIL_R), nuh_layer_id: 0,
temporal_id: 2
[hevc @ 0x14ac15600] First slice in a frame missing.

If I write the stream to the file and play that file either through *ffplay*
or *VLC* the frames are rendered normally.

Any suggestion would be welcomed.

Thanks,
Milos
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