fftools/ffmpeg: do not assume input streams exist

There can be zero input streams, with input provided by lavfi complex filtergraphs.
2 years ago · 005f4e1caf
parent fd8bf8d3b5
commit 005f4e1caf
1 changed files with 5 additions and 1 deletions
--- 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;