[FFmpeg-devel] [PATCH v1 1/2] fftools: add global option to dump filter graph to stderr

[Limin Wang]

On Thu, Nov 21, 2019 at 10:49:28AM +0100, Carl Eugen Hoyos wrote:
> Am Mi., 20. Nov. 2019 um 16:03 Uhr schrieb <lance.lmwang at gmail.com>:
> >
> > From: Limin Wang <lance.lmwang at gmail.com>
> >
> > It's useful for debugging filter graph purposes, now only lavfi can do that.
> >
> > Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
> > ---
> >  doc/ffmpeg.texi         | 4 ++++
> >  fftools/ffmpeg.h        | 1 +
> >  fftools/ffmpeg_filter.c | 7 +++++++
> >  fftools/ffmpeg_opt.c    | 3 +++
> >  4 files changed, 15 insertions(+)
> >
> > diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi
> > index 9cccc2337d..7e55f67898 100644
> > --- a/doc/ffmpeg.texi
> > +++ b/doc/ffmpeg.texi
> > @@ -668,6 +668,10 @@ Defines how many threads are used to process a filter pipeline. Each pipeline
> >  will produce a thread pool with this many threads available for parallel processing.
> >  The default is the number of available CPUs.
> >
> > + at item -filter_dumpgraph (@emph{global})
> > +Dump filter graph to stderr. It is off by default, the option is mostly useful
> > +for debugging filter graph purposes
> > +
> >  @item -pre[:@var{stream_specifier}] @var{preset_name} (@emph{output,per-stream})
> >  Specify the preset for matching stream(s).
> >
> > diff --git a/fftools/ffmpeg.h b/fftools/ffmpeg.h
> > index 7b6f802082..b3133e7e99 100644
> > --- a/fftools/ffmpeg.h
> > +++ b/fftools/ffmpeg.h
> > @@ -608,6 +608,7 @@ extern float max_error_rate;
> >  extern char *videotoolbox_pixfmt;
> >
> >  extern int filter_nbthreads;
> > +extern int filter_dumpgraph;
> >  extern int filter_complex_nbthreads;
> >  extern int vstats_version;
> >
> > diff --git a/fftools/ffmpeg_filter.c b/fftools/ffmpeg_filter.c
> > index 72838de1e2..35ba3a38db 100644
> > --- a/fftools/ffmpeg_filter.c
> > +++ b/fftools/ffmpeg_filter.c
> > @@ -1109,6 +1109,13 @@ int configure_filtergraph(FilterGraph *fg)
> >      if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
> >          goto fail;
> >
> > +    if (filter_dumpgraph) {
> > +        char *dump = avfilter_graph_dump(fg->graph, NULL);
> > +        fputs(dump, stderr);
> > +        fflush(stderr);
> > +        av_free(dump);
> > +    }
> > +
> >      /* limit the lists of allowed formats to the ones selected, to
> >       * make sure they stay the same if the filtergraph is reconfigured later */
> >      for (i = 0; i < fg->nb_outputs; i++) {
> > diff --git a/fftools/ffmpeg_opt.c b/fftools/ffmpeg_opt.c
> > index 71063cc443..44eb890e86 100644
> > --- a/fftools/ffmpeg_opt.c
> > +++ b/fftools/ffmpeg_opt.c
> > @@ -110,6 +110,7 @@ int frame_bits_per_raw_sample = 0;
> >  float max_error_rate  = 2.0/3;
> >  int filter_nbthreads = 0;
> >  int filter_complex_nbthreads = 0;
> > +int filter_dumpgraph = 0;
> >  int vstats_version = 2;
> >
> >
> > @@ -3523,6 +3524,8 @@ const OptionDef options[] = {
> >          "create a complex filtergraph", "graph_description" },
> >      { "filter_complex_threads", HAS_ARG | OPT_INT,                   { &filter_complex_nbthreads },
> >          "number of threads for -filter_complex" },
> > +    { "filter_dumpgraph", OPT_BOOL,                                  { &filter_dumpgraph },
> > +        "dump filter graph to stderr" },
> 
> dump_filtergraph ?

Carl, thanks for the feedback, I'm ok with your recomment name and will
update it if no further comments next time.


> 
> Carl Eugen
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