Tvheadend

Attach or give an URL for a stream example (redirect the output to a mpegts file).

This pipe works for intel vaapi encoding.

gst-launch-1.0 souphttpsrc location="http://127.0.0.1:9981/stream/channelname/Boomerang?mux=matroska" is-live=true ! matroskademux ! vaapidecode ! vaapiencode_h264 ! mpegtsmux ! filesink location=/dev/stdout

Havent figured out the audio yet.

But this video stream goes through tvheadends matroska muxer with no problems.

gst-launch-1.0 souphttpsrc location="http://127.0.0.1:9981/stream/channelname/Boomerang?mux=matroska" is-live=true ! \
matroskademux name=demux demux. ! queue ! h264parse ! vaapidecode ! vaapiencode_h264 ! mux. mpegtsmux name=mux ! filesink location=/dev/stdout demux. ! queue ! mpegaudioparse ! mux.

Intel vaapi encoding with passthrough audio, works! :)

Next problem is mpeg2video input.

gst-launch-1.0 souphttpsrc location="http://127.0.0.1:9981/stream/channelname/National+Geographic+Channel?mux=matroska" is-live=true ! matroskademux name=demux demux. ! queue ! vaapidecode ! vaapipostproc ! vaapiencode_h264 ! mux. mpegtsmux name=mux ! filesink location=/dev/stdout demux. ! queue ! mpegaudioparse ! mux.

For some reason you NEED vaapipostproc to link vaapidecode and vaapiencode_h264 when the input is mpeg2 !
Some might ask what is vaapi encoding ?! Well its a mix of qsv and gl shaders, and is the best thing we will have on linux since intel have commercialized their linux version off their media sdk.

With these pipelines I can transcode something like 20 MPEG2 SD channels at once to H264 on a 2600k only using the gpu. Never cpu's should do much more.

root@raspberrypi:~# gst-launch-1.0 souphttpsrc location="http://192.168.1.59:9981/stream/channelid/596036334" is-live=true ! matroskademux name=demux demux. ! queue ! vaapidecode ! vaapipostproc ! vaapiencode_h264 ! mux. mpegtsmux name=mux ! filesink location=/dev/stdout demux. ! queue ! mpegaudioparse ! mux.
WARNING: erroneous pipeline: could not link queue0 to vaapidecode0

what is the problem?