On 9/3/2021 10:36 AM, James Almer wrote:
Signed-off-by: James Almer <jamr...@gmail.com>
---
  libavfilter/avfiltergraph.c | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavfilter/avfiltergraph.c b/libavfilter/avfiltergraph.c
index 383d9c5478..727c8b7f5c 100644
--- a/libavfilter/avfiltergraph.c
+++ b/libavfilter/avfiltergraph.c
@@ -50,8 +50,8 @@ static const AVOption filtergraph_options[] = {
      { "thread_type", "Allowed thread types", OFFSET(thread_type), 
AV_OPT_TYPE_FLAGS,
          { .i64 = AVFILTER_THREAD_SLICE }, 0, INT_MAX, F|V|A, "thread_type" },
          { "slice", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVFILTER_THREAD_SLICE }, .flags 
= F|V|A, .unit = "thread_type" },
-    { "threads",     "Maximum number of threads", OFFSET(nb_threads),
-        AV_OPT_TYPE_INT,   { .i64 = 0 }, 0, INT_MAX, F|V|A },
+    { "threads", "Maximum number of threads", OFFSET(nb_threads), AV_OPT_TYPE_INT, { 
.i64 = 0 }, 0, INT_MAX, F|V|A, "threads" },
+        {"auto", "autodetect a suitable number of threads to use", 0, AV_OPT_TYPE_CONST, 
{.i64 = 0 }, INT_MIN, INT_MAX, F|V|A, "threads"},
      {"scale_sws_opts"       , "default scale filter options"        , 
OFFSET(scale_sws_opts)        ,
          AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, F|V },
      {"aresample_swr_opts"   , "default aresample filter options"    , 
OFFSET(aresample_swr_opts)    ,

Will apply set.
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