[FFmpeg-user] Any ideas thoughts on this

[JULIAN GARDNER]

We have 4 encoders running and the ffmpeg used was from just before the libav split, so as we were undertaking a major update of our streamer box i took the oppertunity to update the ffmpegs and x264 to the latest and greatest, what a night, finally got to bed around 5am.

Now the reason for this, each box runs around 10 streams and give depending on rates of the streams a load average of between 3.5 and 6.5, icore7 950 @3.06 ghz

So command line before changeover

ffmpeg -metadata service_name="52" -metadata service_provider="Encoder1" -i udp://xxx.xxx.xxx.xxx:yyyy?reuse -vcodec libx264 -preset faster -g 75 -s 512x288 -b 850k -bt 50k -bufsize 2M -r 25 -acodec libfaac -ab 128k -ar 32k -ac 2 -async 1 -f mpegts udp://ooo.ooo.ooo.ooo:pppp?pkt_size=1316;buffer_size=1048576


And after the changeover
ffmpeg -metadata service_name="52" 
-metadata service_provider="Encoder1" -i 
udp://xxx.xxx.xxx.xxx:yyyy?reuse -vcodec libx264 -preset faster  -x264opts keyint=75 -s 512x288 -b 850k -bt 50k -bufsize 2M -r 25 -acodec libfaac -ab 128k -ar 
32k -ac 2 -async 1 -f mpegts 
udp://ooo.ooo.ooo.ooo:pppp?pkt_size=1316;buffer_size=1048576

And now when running these streams x 10, i end up with all 8 cores maxed out and a load average of between 11 and 14, i changed the -preset faster to -preset veryfast and now the load average is way down around 3.5

Does anybody know why this could be happening, and why the massive differnce between faster and veryfast

joolz