Code for TVHEadend to perform VAAPI conversion/streaming via external FFMPEG thread

tvh_external_ffmpeg_transcode.txt

In TVHeadend, create a new Stream Profile using the MPEG-TS SPAWN (Built-in) profile

This one semms to work better:
/usr/local/bin/ffmpeg -loglevel info -hide_banner -nostats -strict experimental -nostdin -err_detect ignore_err -skip_frame -nokey -ignore_unknown -threads 2 -extra_hw_frames 3 -rtbufsize 8096k -hwaccel vaapi -hwaccel_output_format vaapi -hwaccel_device /dev/dri/renderD128 -i pipe:0 -c:v hevc_vaapi -maxrate 5M -b:v 2M -vf 'deinterlace_vaapi=rate=field:auto=1,hwupload' -g 100 -c:a aac -b:a 128k -profile:a aac_main -c:s copy -f matroska pipe:1


This was the old one:
/usr/local/bin/ffmpeg -loglevel info -hide_banner -nostats -strict experimental -nostdin -err_detect ignore_err -skip_frame -nokey -ignore_unknown -threads 1 -extra_hw_frames 3 -rtbufsize 4096k -hwaccel vaapi -hwaccel_device /dev/dri/renderD129 -hwaccel_output_format vaapi -i pipe:0 -c:v hevc_vaapi -maxrate 5M -b:v 2M -vf 'deinterlace_vaapi=rate=field:auto=1,hwupload' -c:a aac -b:a 128k -profile:a aac_main -c:s copy -force_key_frames expr:gte(t,n_forced*3) -f matroska pipe:1

Set the following Mime Type:
video/x-matroska

Recommend once its all working properly, changel the loglevel to quiet, fatal or error to avoid clogging up the log files.