[FFmpeg-user] Can I speed up transcoding?

[Henk D. Schoneveld]

In your 1st posting, ffmpeg cli output, can be seen that the file is encode with threads=1, that suggests on EC2 only 1 cpu core is presented to ffmpeg. So if more cores are available to you on EC2 you probably have to specifically have to ask for more cores with the threads 2 after c:v. Like ffmpeg -y -i some file.ext -c:v libx264 -threads 2  etc.

Henk 
On Jan 8, 2013, at 10:02 AM, Henk D. Schoneveld <belcampo at zonnet.nl> wrote:

> 
> On Jan 8, 2013, at 4:56 AM, Leo Papadopoulos <leo at telecomcto.com> wrote:
> 
>> Carl:
>> 
>> Thanks for replying.
>> 
>> I have tried ultrafast but it uses almost 2x the disk space. I may still go
>> with this option. I need to see how much more disk costs on Amazon's EC2. I
>> was hoping maybe there were other ways. I see a 'threads' option in the
>> ffmpeg command, but I don't know if this would help.
> AFAIK and just tested on OSX threads is enabled by default. It takes the cores it finds available. I don't know how EC2 presents it's recourses. You can try -threads 2 or 3 depending what the system else is supposed to do. On a i5 2500k/4-cores I get fps=150 from an arbitrary file to 640x480 output in mp4 container.
>> 
>> The reason I use -vsync 1 is because someone suggested this from this
>> mailing list when I was having trouble with lip sync in the video. However,
>> re-encoding the H.264 (I think fixes lip sync). Do you think it would help
>> to either remove or play with -vsync?
>> 
>> Leo P.
>> 
>> _________________________________________
>> Leo Papadopoulos (leo at telecomcto.com)
>> TelecomCTO, LLC <http://telecomcto.com>
>> Virtual Number: +1(203)539-0448
>> Linkedin <https://www.linkedin.com/in/leopapadopoulos> -
>> Twitter<https://twitter.com/LeoP_TCTO>
>> _______________________________________________
>> ffmpeg-user mailing list
>> ffmpeg-user at ffmpeg.org
>> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
> 
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user