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

Paul Gardiner lists at glidos.net
Sat Jan 28 17:24:02 CET 2012

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.


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