From: Limin Wang <lance.lmw...@gmail.com>
It's useful for debugging filter graph purposes, now only lavfi can do that.
Signed-off-by: Limin Wang <lance.lmw...@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.
+@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" },
{ "lavfi", HAS_ARG | OPT_EXPERT, {
.func_arg = opt_filter_complex },
"create a complex filtergraph", "graph_description" },
{ "filter_complex_script", HAS_ARG | OPT_EXPERT, {
.func_arg = opt_filter_complex_script },
--
2.21.0
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