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

[Strahinja Radman]

On Thu, 23 Mar 2023 at 18:21, Michael Wood <mornwood23 at gmail.com> wrote:

> 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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Hi Milos,

If you are using library check the frame stride. Dimensions seem to be good
but wrong stride could lead to only part of the frame being decoded.

Kind regards,
Strahinja
-- 

Regards
Strahinja Radman
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