From e8e7eb150f152c9e4858ef0be3e76e4f98533cf6 Mon Sep 17 00:00:00 2001
From: Nicolas George <george@nsup.org>
Date: Sun, 25 Oct 2015 19:48:10 +0100
Subject: [PATCH] ffmpeg_filter: check encoder before using it to set frame
 size.

Fix a segfault when no encoder is found for a default codec
with a complex filter graph.
---
 ffmpeg_filter.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ffmpeg_filter.c b/ffmpeg_filter.c
index 10b2f5f722..9142a97e8f 100644
--- a/ffmpeg_filter.c
+++ b/ffmpeg_filter.c
@@ -1046,6 +1046,13 @@ int configure_filtergraph(FilterGraph *fg)
 
     for (i = 0; i < fg->nb_outputs; i++) {
         OutputStream *ost = fg->outputs[i]->ost;
+        if (!ost->enc) {
+            /* identical to the same check in ffmpeg.c, needed because
+               complex filter graphs are initialized earlier */
+            av_log(NULL, AV_LOG_ERROR, "Encoder (codec %s) not found for output stream #%d:%d\n",
+                     avcodec_get_name(ost->st->codec->codec_id), ost->file_index, ost->index);
+            return AVERROR(EINVAL);
+        }
         if (ost &&
             ost->enc->type == AVMEDIA_TYPE_AUDIO &&
             !(ost->enc->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE))