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

[Francois Visagie]

> -----Original Message-----
> From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-
> bounces at ffmpeg.org] On Behalf Of David Wagner
> Sent: 11 September 2012 00:38
> To: FFmpeg user questions
> Subject: Re: [FFmpeg-user] Benchmarking with ffmpeg - What are the
> parameters meaning?
> 
> 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.

It isn't quite clear to me exactly what time lapse you want to measure. If
it's for the whole ffmpeg pass from start to finish, I use the below on
Windows. %INPUT% and %OUTPUT% are set to the input and output filenames
respectively. %PASS% is obviously set to the pass. My script actually uses a
single command line for both passes, appropriately adjusted for each. So the
first time execution passes through here %PASS% is set to 1 and the 2nd time
to 2.

Hopefully this is of some help.

echo Start %INPUT% >%OUTPUT%.time.txt

echo Start pass %PASS% >>%OUTPUT%.time.txt
echo. | date | find /v "Enter the new date: (yy-mm-dd)" >>%OUTPUT%.time.txt
echo. | time | find /v "Enter the new time:" >>%OUTPUT%.time.txt

ffmpeg ... -pass %PASS% ...

echo End pass %PASS% >>%OUTPUT%.time.txt
echo. | date | find /v "Enter the new date: (yy-mm-dd)" >>%OUTPUT%.time.txt
echo. | time | find /v "Enter the new time:" >>%OUTPUT%.time.txt

> > Carl Eugen
> >
> > _______________________________________________
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> > ffmpeg-user at ffmpeg.org
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> >
> 
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