There can be zero input streams, with input provided by lavfi complex
filtergraphs.
---
fftools/ffmpeg.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
index 0944f56b80..c43c3ca3bc 100644
--- a/fftools/ffmpeg.c
+++ b/fftools/ffmpeg.c
@@ -3401,7 +3401,11 @@ static int check_keyboard_interaction(int64_t cur_time)
if (key == 'd' || key == 'D'){
int debug=0;
if(key == 'D') {
- debug = ist_iter(NULL)->dec_ctx->debug << 1;
+ InputStream *ist = ist_iter(NULL);
+
+ if (ist)
+ debug = ist->dec_ctx->debug << 1;
+
if(!debug) debug = 1;
while (debug & FF_DEBUG_DCT_COEFF) //unsupported, would just crash
debug += debug;
--
2.35.1
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