[FFmpeg-user] Benchmarking with ffmpeg - What are the parameters meaning?

David Wagner david.wagner123 at googlemail.com
Tue Sep 11 00:37:53 CEST 2012


Am 09.09.2012 23:01, schrieb Carl Eugen Hoyos:
> David Wagner<david.wagner123<at>  googlemail.com>  writes:
>
>> frame= 1065 fps=214 q=-1.0 Lsize=     238kB time=00:00:35.46
>> bitrate=   55.0kbits/s
>> bench: utime=8.781s maxrss=49488kB
>>
>> What is meant by the fps? Is it the (averaged) speed at which
>> the frames are processed?
> No, not averaged but current.
>
>> So 1065frames / 214fps = 4,97 s. Which is not equal utime
>> = 8,7818s.
>> Also I have seen that at the end time=00:00:35.46 is exactly
>> the length of the encoded video.
> That is correct and this should be very accurate.
>
>> Could someone please explain me the
>> parameters?
> If you mean frame, size and bitrate, I assumed they are
> self-explanatory...
> (I suspect bitrate is also current, not average, but I
> did not test.)
> utime is the time spent on CPU, maxrss should be
> maximum memory footprint.
>
I couldn't find much information about theses parameters. Can you tell 
me is utime a good one for comparing codecs?
What benefit do I have from knowing maximum memory footprint? It doesn't 
seem much informative.
>> BTW exists there a mode for benchmarking the DEcoding process,
>> so that I have some stats and won't need to play all the
>> files in realtime?
> I always use:
> $ time ffmpeg -i input -f null -
>
Unfortunately I wanted to do the whole process on windows. So I don't 
have time.
> Carl Eugen
>
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