You're directly using a path with -hwaccel_device so I'm not sure what the name of your device is, but you may not need these extra arguments. The vaapi0 here is a named device I've initialised with init_hw_device. In my case I'm also using -filter_hw_device vaapi0 -vf format=nv12|vaapi,hwupload (specified before -c:v hevc_vaapi). So you need to adjust for 8-bit there: -hwaccel_output_format yuv420p. It's outputting frames in VAAPI format and not the format you need (read more here, also quoted a section at the end of this comment).

Your problem is (most likely) with -hwaccel_output_format vaapi. I've just been figuring this out as well.

However that gives me the error: Impossible to convert between the formats supported by the filter 'Parsed_scale_vaapi_0' and the filter 'auto_scaler_0' I've also tried making this change to the command: 'scale_vaapi=w=-1:h=1080,format=yuv420p' I've tried adding -pix_fmt yuv420p but that gives me this error: Incompatible pixel format 'yuv420p' for codec 'hevc_vaapi', auto-selecting format 'vaapi_vld' The error I get is: No usable encoding entrypoint found for profile VAProfileHEVCMain10 (18).Įrror initializing output stream 0:0 - Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or heightįrom what I can tell ffmpeg looks at the source and selectes VAProfileHEVCMain10 instead of VAProfileHEVCMain. It seems that ffmpeg is attempting to keep the video as 10-bit to match the source rather than allowing me to convert to 8-bit and this is creating an error.įfmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i -map 0:0 -c:v:0 hevc_vaapi -vf 'scale_vaapi=w=-1:h=1080' -b:v 4027047 -map 0:1 -c:a:0 aac -b:a 384000 -ac 6 -map 0:s -scodec copy -map_metadata:g -1 -metadata JBDONEVERSION=1 -metadata JBDONEDATE=T20:52:36.072Z -map_chapters 0 My processor, an Intel Celeron J3455, supports hardware decoding/encoding H.265 at 8-bit but only hardware decoding for 10-bit.

This is generally working but I've run into an issue when trying to convert an existing file from 10-bit H.265 to 8-bit H.265. I'm trying to convert my library from various formats into HEVC 8-bit mainly to shrink my library down.

Ffmpeg convert hevc to h264