[MEncoder-users] How to transcode MTS files recorded by Panasonic HDC-SD100 camera?

[Marton Sigmond]

That is above 80 FPS.

Following command is executed at 39 FPS:
ffmpeg -threads 1 -i %out -f null -s vga -aspect 16:9 -


This one is 42 FPS:
ffmpeg -threads 1 -i %out -f null -r 25 -


However when I combine the two it is only 19 FPS:
ffmpeg -threads 1 -i %out -f null -r 25 -s vga -aspect 16:9 -


Is it possible to run multiple ffmpeg instances in cascade (redirecting the output of one into the input of the next one)?
I suppose each instance would naturally be running on a different CPU core.
One could decode the input stream and convert to 25 fps (1), a second one could resize the stream (2), and a third one could encode the final mpeg stream.

Or is there a mencoder alternative that automagically achieve this?

Best regards,
Marton


________________________________
 From: Carl Eugen Hoyos <cehoyos at ag.or.at>
To: mencoder-users at mplayerhq.hu 
Sent: Tuesday, February 14, 2012 1:26 AM
Subject: Re: [MEncoder-users] How to transcode MTS files recorded by Panasonic HDC-SD100 camera?
 
Marton Sigmond <marton_sigmond <at> yahoo.com> writes:

> 
> Thanks for the tips, now I am at 18 FPS with the following command:
> ffmpeg -y -threads 16 -i %in -f mpegts -r 25 -vcodec mpeg2video 
> -s vga -aspect 16:9 -maxrate 1800k -b 1500k -bufsize 4096k 
> -mbd 0 -acodec libmp3lame -ar 48000 -ab 128k -ac 2 %out
> 
> Getting closer. :)

How fast is
ffmpeg -threads n -i file -f null -
?

If that isn't fast enough you have to add skiploopfilter all 
(I don't know the exact ffmpeg command), the next step would 
be skipframe nonref (which skips all B-frames).

Carl Eugen

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