Hi,
You have dual core cpu, you show that with 1 ffmpeg it use 77% of one
core (so like ~40% of cpu), with 2 ffmpeg it use 90% of first and second
core (so like 90% of cpu), with 2 ffmpeg it uses almost all cpu, so no
wonder that with 3 ffmpeg it slowing down because it need 1,5 more cpu,
you would need have at least 40% better cpu to run all 3 ffmpeg... With
3 ffmpeg it using all cpu, some slowed to take 50% of core when it
needed 77-90%...
Did you compile ffmpeg by self? Some good gcc flags can speed up ffmpeg...
chronek
W dniu 2017-06-13 o 15:03, Hendrik Karsimin pisze:
Hi,
I've been trying to transcode the Full HD Channel (1920x1080) to SD
(720x576).
When I transcode 1 channel, the resulting video is no problem. So are when
transcode 2 channel.
But when the 3rd channel I tried to transcode start. the FPS start to drop
on all the channel I transcoding.
I'm not sure if it's a computer hardware limitation or the software
limitation.
But I have tried to change some parameter of ffmpeg, and settle on the last
ffmpeg configuration I use now.
Attached is the information I collect on the PC I use to transcode.
The Ubuntu Version I use is Ubuntu 14.04.5
#lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.5 LTS
Release: 14.04
Codename: trusty
#uname -a
Linux Compaq 3.13.0-119-generic #166-Ubuntu SMP Wed May 3 12:18:55 UTC 2017
x86_64 x86_64 x86_64 GNU/Linux
Need advice to resolve this problem.
*Thanks & regards,*
Hendrik
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