[FFmpeg-devel] [PATCH v3] ffmpeg: parameters for filter thread counts

[DeHackEd]

On 11/06/2016 06:44 AM, Michael Niedermayer wrote:
> On Sun, Oct 30, 2016 at 09:25:39AM -0400, DeHackEd wrote:
> [...]
> 
>>      if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
>> diff --git a/ffmpeg_opt.c b/ffmpeg_opt.c
>> index 4d25fff..dc94380 100644
>> --- a/ffmpeg_opt.c
>> +++ b/ffmpeg_opt.c
>> @@ -3365,12 +3365,16 @@ const OptionDef options[] = {
>>          "set profile", "profile" },
>>      { "filter",         HAS_ARG | OPT_STRING | OPT_SPEC | OPT_OUTPUT, { .off = OFFSET(filters) },
>>          "set stream filtergraph", "filter_graph" },
>> +    { "filter_threads",  HAS_ARG | OPT_INT,                          { &filter_nbthreads },
>> +        "number of non-complex filter threads" },
>>      { "filter_script",  HAS_ARG | OPT_STRING | OPT_SPEC | OPT_OUTPUT, { .off = OFFSET(filter_scripts) },
>>          "read stream filtergraph description from a file", "filename" },
>>      { "reinit_filter",  HAS_ARG | OPT_INT | OPT_SPEC | OPT_INPUT,    { .off = OFFSET(reinit_filters) },
>>          "reinit filtergraph on input parameter changes", "" },
>>      { "filter_complex", HAS_ARG | OPT_EXPERT,                        { .func_arg = opt_filter_complex },
>>          "create a complex filtergraph", "graph_description" },
>> +    { "filter_complex_threads", HAS_ARG | OPT_INT,                   { &filter_complex_nbthreads },
>> +        "number of threads for -filter_complex" },
>>      { "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 },
> 
> why are there 2 options instead of 1 ?
> 

One affects -filter_complex filtergraphs, one affects -af and -vf filtergraphs...

The main motivation was that you typically have one -filter_complex graph, but could have many -af and -vf filtergraphs,
so if you are trying to limit how many threads you use then you would have different needs depending on which type you
are using.