Re: [FFmpeg-devel] [BASIC QUESTION] Profiling tool for ffmpeg

[Stone Chen <chen.stonechen@gmail.com>]

On Mon, Feb 24, 2025 at 9:54 AM Devin Heitmueller <
devin.heitmueller@ltnglobal.com> wrote:

> On Mon, Feb 24, 2025 at 9:43 AM Cesar Matheus
> <cesar.matheus@telecom-paris.fr> wrote:
> >
> > Hi, I'm a CS student working on an optimisation of the ebur128 filter.
> First I'm looking for the nicest way to get information on code performance.
> > I saw  that the configuration flag   "--enable-linux-perf"      enables
> Linux Performance Monitor API, I've been using the perf tool with the
> following commands for example :
> >
> > ./perf record -F 99 -a -g --call-graph dwarf ./ffmpeg -i test.wav -vn
> -af loudnorm=print_format=summary:dual_mono=true -f null /dev/null
> >
> > but I'm not quite satisfate with the result.
> >
> > Do you have any advice on how to properly extract informations such as
> execution time, function call graph etc.. in such a case using profiling
> tool (perf or gprof for example ?
>
> I've had excellent success with Intel VTune, which while not open
> source is freely available:
>
>
> https://www.intel.com/content/www/us/en/developer/tools/oneapi/vtune-profiler.html#gs.k0kfve


AMD equivalent, though not nearly as nice as VTune imo.

https://www.amd.com/en/developer/uprof.html

<https://www.intel.com/content/www/us/en/developer/tools/oneapi/vtune-profiler.html#gs.k0kfve>
>
> Function call timing, memory bandwidth utilization (if on an Intel
> CPU), cache analysis, and very easy to get up and running.  The hard
> part is understanding the results, but the GUI makes that *much*
> easier than any command line perf based solution.
>
> But yeah, as Kieran pointed out, for any of these solutions you should
> be using the version of the ffmpeg binary that contains debug info.
>
> Devin
>
> --
> Devin Heitmueller, Senior Software Engineer
> LTN Global Communications
> o: +1 (301) 363-1001
> w: https://ltnglobal.com  e: devin.heitmueller@ltnglobal.com
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