[FFmpeg-user] Please can someone tell me why this ffmpeg command stopped working

Paul Gardiner lists at glidos.net
Sat Jan 28 17:33:00 CET 2012

On 28/01/2012 16:24, Paul Gardiner wrote:
> On 28/01/2012 16:10, Reindl Harald wrote:
>> Am 28.01.2012 16:53, schrieb Paul Gardiner:
>>> Can anybody see what is wrong with this:
>>> /usr/bin/ffmpeg -f ac3 -ar 48000 -i /tmp/mythar4336/audout -f
>>> rawvideo -top 1 -pix_fmt yuv420p -s 1440x1088 -r 25
>>> -i /tmp/mythar4336/vidout -threads 2 -vf
>>> crop=1440:1080:0:0,scale=1280:720 -vcodec libx264 -preset medium -crf
>>> 20.0
>>> -bufsize 25000k -maxrate 20000k -aspect 16:9 -acodec copy -f mp4
>>> /home/public/video/Archive/Horizon - Playing God.mp4
>>> Until a recent ffmpeg update, it used to do exactly what I wanted, but
>>> now it produces the error message: "Option sample_rate not found." I've
>>> googled and found various references to people having to make sure
>>> arguments are in the right order with later versions of ffmpeg, but
>>> my command seems to obey the rules, plus attempts I have made to reorder
>>> have not helped.
>> "-f ac3 -ar 48000 -i"
>> why is "-ar" BEFORE the input file?
>> in this case you set the parameter for the input instead the output
> Thanks for the reply. That could be it, although I have a nasty feeling
> that one of my experiments was to put that after the input file
> (perhaps I didn't move it far enough and it ended up attached to the
> second input file). I'll try moving it to after "-acodec copy".
> My thinking was that the input was 48kHz and I needed to tell ffmpeg
> that information about the input. I guess that's showing my
> misunderstanding about how it works.
> Off to try the alteration now.

Brilliant! It worked. I am again able to transcode my TV recordings.
I guess I should also move the "-r 25" from before the second input-file 
argument. Is that right?

Thank you,

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