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fftools/ffmpeg: add support for setting maximum buffered frames in a filtergraph

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Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint
2025-07-06 11:28:13 +02:00
parent b24155cae1
commit 7d54fad868
4 changed files with 20 additions and 0 deletions
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9
doc/ffmpeg.texi
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@ -1384,6 +1384,15 @@ 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_buffered_frames @var{nb_frames} (@emph{global})
Defines the maximum number of buffered frames allowed in a filtergraph. Under
normal circumstances, a filtergraph should not buffer more than a few frames,
especially if frames are being fed to it and read from it in a balanced way
(which is the intended behavior in ffmpeg). That said, this option allows you
to limit the total number of frames buffered across all links in a filtergraph.
If more frames are generated, filtering is aborted and an error is returned.
The default value is 0, which means no limit.
@item -pre[:@var{stream_specifier}] @var{preset_name} (@emph{output,per-stream})
Specify the preset for matching stream(s).

1
fftools/ffmpeg.h
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@ -737,6 +737,7 @@ extern float max_error_rate;
extern char *filter_nbthreads;
extern int filter_complex_nbthreads;
extern int filter_buffered_frames;
extern int vstats_version;
extern int print_graphs;
extern char *print_graphs_file;

6
fftools/ffmpeg_filter.c
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@ -1949,6 +1949,12 @@ static int configure_filtergraph(FilterGraph *fg, FilterGraphThread *fgt)
fgt->graph->nb_threads = filter_complex_nbthreads;
}
if (filter_buffered_frames) {
ret = av_opt_set_int(fgt->graph, "max_buffered_frames", filter_buffered_frames, 0);
if (ret < 0)
return ret;
}
hw_device = hw_device_for_filter();
ret = graph_parse(fg, fgt->graph, graph_desc, &inputs, &outputs, hw_device);

4
fftools/ffmpeg_opt.c
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@ -75,6 +75,7 @@ int stdin_interaction = 1;
float max_error_rate = 2.0/3;
char *filter_nbthreads;
int filter_complex_nbthreads = 0;
int filter_buffered_frames = 0;
int vstats_version = 2;
int print_graphs = 0;
char *print_graphs_file = NULL;
@ -1714,6 +1715,9 @@ const OptionDef options[] = {
{ "filter_threads", OPT_TYPE_FUNC, OPT_FUNC_ARG | OPT_EXPERT,
{ .func_arg = opt_filter_threads },
"number of non-complex filter threads" },
{ "filter_buffered_frames", OPT_TYPE_INT, OPT_EXPERT,
{ &filter_buffered_frames },
"maximum number of buffered frames in a filter graph" },
#if FFMPEG_OPT_FILTER_SCRIPT
{ "filter_script", OPT_TYPE_STRING, OPT_PERSTREAM | OPT_EXPERT | OPT_OUTPUT,
{ .off = OFFSET(filter_scripts) },