For simple filtergraphs. For complex filtergraphs they always match.
---
fftools/ffmpeg_filter.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/fftools/ffmpeg_filter.c b/fftools/ffmpeg_filter.c
index 0d359303f7..a59c61b312 100644
--- a/fftools/ffmpeg_filter.c
+++ b/fftools/ffmpeg_filter.c
@@ -773,6 +773,7 @@ int ofilter_bind_ost(OutputFilter *ofilter, OutputStream
*ost,
int ret;
av_assert0(!ofilter->ost);
+ av_assert0(ofilter->type == ost->type);
ofilter->ost = ost;
av_freep(&ofilter->linklabel);
@@ -1106,6 +1107,13 @@ int init_simple_filtergraph(InputStream *ist,
OutputStream *ost,
graph_desc, fg->nb_inputs, fg->nb_outputs);
return AVERROR(EINVAL);
}
+ if (fg->outputs[0]->type != ost->type) {
+ av_log(fg, AV_LOG_ERROR, "Filtergraph has a %s output, cannot connect "
+ "it to %s output stream\n",
+ av_get_media_type_string(fg->outputs[0]->type),
+ av_get_media_type_string(ost->type));
+ return AVERROR(EINVAL);
+ }
ost->filter = fg->outputs[0];
--
2.43.0
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