[ffmpeg] treat nan/-nan tbase as 0 #2241

src/media/ffmpeg.c

@@ -491,6 +491,9 @@ int ffmpeg_stream(notcurses* nc, ncvisual* ncv, float timescale,
     // all media when we loop =[. we seem to be accurate enough now with the
     // tbase/ppd. see https://github.com/dankamongmen/notcurses/issues/1352.
     double tbase = av_q2d(ncv->details->fmtctx->streams[ncv->details->stream_index]->time_base);
+    if(isnan(tbase)){
+      tbase = 0;
+    }
     if(activevopts.n){
       ncplane_erase(activevopts.n); // new frame could be partially transparent
     }