On 04/09/16 12:57, Andy Furniss wrote:
...
Good to know - I had -r pasted away in my notes.
So in terms of benchmarking it seems to replace -r needs use of vsync 2
- it's horrible without when asking for high fps, but current git does
warn to use it.
For me cpus forced to perf I get -
ffmpeg -vsync 2 -framerate 200 -f x11grab -s 1920x1080 -i :0.0 -vframes 1000
-f null -
frame= 1000 fps=138 q=-0.0 Lsize=N/A time=00:00:07.24 bitrate=N/A speed= 1x
ffmpeg -vsync 2 -framerate 200 -f x11grab -s 1920x1080 -i :0.0 -vframes 1000
-pix_fmt yuv420p -f null -
frame= 1000 fps= 47 q=-0.0 Lsize=N/A time=00:00:21.27 bitrate=N/A speed= 1x
ffm -vsync 2 -framerate 200 -f x11grab -s 1920x1080 -i :0.0 -vframes 1000
-pix_fmt nv12 -f null -
frame= 1000 fps= 33 q=-0.0 Lsize=N/A time=00:00:30.41 bitrate=N/A speed=0.999x
Which is a quite low (IIRC I managed to get gstreamer to do 60).
My h/w enc needs nv12 and is capable of 2160p60 real time.
Of course it may do 444 just it's not implemented and I guess doing the
CSC on the GPU would be another way to go.
For those who haven't followed the developers mailing list; this has improved
with the latest git. One can stream in H.264 and H.265 from a 1920x1080 desktop
with a frame rate well above 60Hz (~100fp/s with an Nvidia GeForce GTX 960).
Anyone who has never tried it and wants to can test it on Twitch.TV: 1.) Create
an account, 2.) go to the dashboard, 3.) reveal the streaming key and 4.) run
ffmpeg:
$ export KEY="live_0123456789_aBcDeFgH...." # keep it secret - don't stream the
command line arguments or it will show up on the video
$ ffmpeg -f x11grab -s hd1080 -framerate 200 -i :0.0 -c:v h264_nvenc -rc cbr
-b:v 500k -f flv -y "rtmp://live.justin.tv/app/$KEY"
Takes a minute before it comes live (with a video delay of about 10 seconds) and
then one can watch one's desktop on Twitch.TV and share it with others. Note,
Twitch currently only accepts H.264 CBR with bit rates of up to 3.5mbit. The bit
rate should be set so it can fit through one's uplink speed, which depending on
ISPs may require adjusting.
To watch the stream on Twitch.TV with HTML5 requires the URL
"http://player.twitch.tv/?channel=$ACCOUNT&html5"; where $ACCOUNT is the account
name on Twitch. Under options can one bring up a status window, which will
confirm the frame rate (as just now tested did it show a frame rate of 80-100
fps for me).
Sven
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