Faster casting through -f mpegts/hls

[mrquincle]

How can I stream HLS to the Chromecast?

If I am streaming with -f mpegts or -f hls I can stream with latencies of less than one second (on the same system). As soon as I'm using -f mp4 it goes quickly up to 5 seconds.

ffmpeg -thread_queue_size 512  \
    -f x11grab -s 3200x1800 -framerate $framerate -i :0.0 \
    -vaapi_device /dev/dri/renderD128 -vf format=nv12,hwupload,scale_vaapi=w=1920:h=1080 \
    -c:v h264_vaapi \
    -f hls \
    - | nc -l -p 9000

Test with:

nc localhost 9000 | mplayer -benchmark -

For now I could only find ways to screen cast to the Chromecast using -f mp4. I already found out that there's somewhere a mimetype hardcoded to /videos/mp4 and changed it - for now - to:

if mtype is None:                                                                                                       
    mtype = "application/x-mpegurl"

However, I still am not able to have anything appear on the screen. I know Chromecast is difficult on what kind of HLS stream it accepts, but it should be possible!

Are there some kind of hls flags that will magically do this? I know it's kind of out of scope for your projects, but perhaps you'd like to tweak around. :-) Especially for screen casting it will be nice!