[FFmpeg-devel] [PATCH v2 1/2] fftools: add global option to dump filter graph to stderr

[Limin Wang]

ping, please help to review it and push it. It's useful to check the auto insert
filters for debug.


On Tue, Nov 26, 2019 at 09:41:30AM +0800, lance.lmwang at gmail.com wrote:
> From: Limin Wang <lance.lmwang at gmail.com>
> 
> It's useful for debugging filter graph purposes, now only lavfi can do that.
> 
> Reviewed-by: Carl Eugen Hoyos <ceffmpeg at gmail.com>
> 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..f822a1025e 100644
> --- a/doc/ffmpeg.texi
> +++ b/doc/ffmpeg.texi
> @@ -735,6 +735,10 @@ Technical note -- attachments are implemented as codec extradata, so this
>  option can actually be used to extract extradata from any stream, not just
>  attachments.
>  
> + at item -dump_filtergraph (@emph{global})
> +Dump filter graph to stderr. It is off by default, the option is mostly useful
> +for debugging filter graph purposes
> +
>  @item -noautorotate
>  Disable automatically rotating video based on file metadata.
>  
> diff --git a/fftools/ffmpeg.h b/fftools/ffmpeg.h
> index 7b6f802082..5b8319da07 100644
> --- a/fftools/ffmpeg.h
> +++ b/fftools/ffmpeg.h
> @@ -607,6 +607,7 @@ extern AVIOContext *progress_avio;
>  extern float max_error_rate;
>  extern char *videotoolbox_pixfmt;
>  
> +extern int dump_filtergraph;
>  extern int filter_nbthreads;
>  extern int filter_complex_nbthreads;
>  extern int vstats_version;
> diff --git a/fftools/ffmpeg_filter.c b/fftools/ffmpeg_filter.c
> index 72838de1e2..edc15cff61 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 (dump_filtergraph) {
> +        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..7616209a43 100644
> --- a/fftools/ffmpeg_opt.c
> +++ b/fftools/ffmpeg_opt.c
> @@ -101,6 +101,7 @@ int copy_ts           = 0;
>  int start_at_zero     = 0;
>  int copy_tb           = -1;
>  int debug_ts          = 0;
> +int dump_filtergraph  = 0;
>  int exit_on_error     = 0;
>  int abort_on_flags    = 0;
>  int print_stats       = -1;
> @@ -3535,6 +3536,8 @@ const OptionDef options[] = {
>      { "dump_attachment", HAS_ARG | OPT_STRING | OPT_SPEC |
>                           OPT_EXPERT | OPT_INPUT,                     { .off = OFFSET(dump_attachment) },
>          "extract an attachment into a file", "filename" },
> +    { "dump_filtergraph", OPT_BOOL,                                  { &dump_filtergraph },
> +        "dump filter graph to stderr" },
>      { "stream_loop", OPT_INT | HAS_ARG | OPT_EXPERT | OPT_INPUT |
>                          OPT_OFFSET,                                  { .off = OFFSET(loop) }, "set number of times input stream shall be looped", "loop count" },
>      { "debug_ts",       OPT_BOOL | OPT_EXPERT,                       { &debug_ts },
> -- 
> 2.21.0
>