[FFmpeg-user] FPS drop when transcode 3 Full HD channel to SD

[Alex Molon]

How many CPUs / cores are you using?
Transcoding FullHD in SD, without using any hardware accelleration for more than two channels seems a quite huge load.
It can be simply your CPU cannot go fast enough

-----Original Message-----
From: ffmpeg-user [mailto:ffmpeg-user-bounces at ffmpeg.org] On Behalf Of Hendrik Karsimin
Sent: 13 June 2017 14:03
To: ffmpeg-user at ffmpeg.org
Subject: [FFmpeg-user] FPS drop when transcode 3 Full HD channel to SD

Warning: This message has had one or more attachments removed
Warning: (encode_cna.out.log, encode_okto.out.log, when 3 ffmpeg running.zip, encode_suria.out.log).
Warning: Please read the "vision247.com-Attachment-Warning.txt" attachment(s) for more information.

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