[FFmpeg-user] hevc_vaapi mkv output fails with generic error

[Xiang, Haihao]

According to the your debug output below, the encoded stream is not muxable to
some containers, maybe this the root cause of your issue.

[hevc_vaapi @ 0x5239bc0] Driver does not support some wanted packed headers
(wanted 0xd, found 0).
[hevc_vaapi @ 0x5239bc0] Driver does not support packed sequence headers, but a
global header is requested.
[hevc_vaapi @ 0x5239bc0] No global header will be written: this may result in a
stream which is not usable for some purposes (e.g. not muxable to some
containers).

Thanks
Haihao

> Hello everyone,
> 
> I am currently unable to transcode H264 MKV to HEVC MKV on an AMD Ryzen
> 3400G running openSuSE Leap 15.2. 
>  
> Using following command
>  
> ffmpeg -loglevel debug -vaapi_device /dev/dri/renderD128 -hwaccel vaapi
> -hwaccel_output_format vaapi -i sample.mkv -c:v hevc_vaapi -vf
> 'hwdownload,format=nv12,hwupload' -rc_mode 3 -b:v 3M -profile:v 1 -tier
> 1 -level 153 -c:a copy output.mkv
>  
> I am getting follwing error message
>  
> [AVHWFramesContext @ 0x52a3cc0] Created surface 0x22.
> [AVHWFramesContext @ 0x52a3cc0] Direct mapping disabled: deriving image
> does not work: 1 (operation failed).
> [matroska @ 0x5235ec0] get_metadata_duration returned: 0
> Could not write header for output file #0 (incorrect codec parameters
> ?): Invalid data found when processing input
> Error initializing output stream 0:0 --
> [AVIOContext @ 0x5209740] Statistics: 0 seeks, 1 writeouts
> [AVIOContext @ 0x5284400] Statistics: 197393 bytes read, 2 seeks
>  
> FFmpeg static build by myself.
>  
> Is there anyone who can help me understanding what is going on here and
> how to get this working?
> I am breaking my head for 3 days now trying to solve this issue.
>  
> Full debug output here: https://pastebin.com/khp5g9F5
> <
> https://deref-web.de/mail/client/gxpESspRx9g/dereferrer/?redirectUrl=https%3A%2F%2Fpastebin.com%2Fkhp5g9F5
> >
>  
> Best regards,
> Andreas
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