ffmpeg_filter: Check that filters have connected outputs before accessing the output stream

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

1 files changed, 5 insertions, 0 deletions

diff --git a/ffmpeg_filter.c b/ffmpeg_filter.c
index b452fe0682..950e4d02e9 100644
--- a/ffmpeg_filter.c
+++ b/ffmpeg_filter.c
@@ -641,6 +641,11 @@ int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOu
     av_freep(&ofilter->name);
     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 
+    if (!ofilter->ost) {
+        av_log(NULL, AV_LOG_FATAL, "Filter %s has a unconnected output\n", ofilter->name);
+        exit_program(1);
+    }
+
     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);