avformat/utils: Provide context for av_log() where one is available

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/utils.c

@@ -1085,7 +1085,7 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
         pkt->pts > pkt->dts)
         presentation_delayed = 1;
 
-    av_log(NULL, AV_LOG_TRACE,
+    av_log(s, AV_LOG_TRACE,
             "IN delayed:%d pts:%s, dts:%s cur_dts:%s st:%d pc:%p duration:%d delay:%d onein_oneout:%d\n",
             presentation_delayed, av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts),
             pkt->stream_index, pc, pkt->duration, delay, onein_oneout);
@@ -1151,7 +1151,7 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
     if (pkt->dts > st->cur_dts)
         st->cur_dts = pkt->dts;
 
-    av_log(NULL, AV_LOG_TRACE, "OUTdelayed:%d/%d pts:%s, dts:%s cur_dts:%s\n",
+    av_log(s, AV_LOG_TRACE, "OUTdelayed:%d/%d pts:%s, dts:%s cur_dts:%s\n",
             presentation_delayed, delay, av_ts2str(pkt->pts), av_ts2str(pkt->dts), av_ts2str(st->cur_dts));
 
     /* update flags */
@@ -2986,7 +2986,7 @@ void ff_rfps_calculate(AVFormatContext *ic)
                         num = get_std_framerate(j);
                     }
                     if (error < 0.02)
-                        av_log(NULL, AV_LOG_DEBUG, "rfps: %f %f\n", get_std_framerate(j) / 12.0/1001, error);
+                        av_log(ic, AV_LOG_DEBUG, "rfps: %f %f\n", get_std_framerate(j) / 12.0/1001, error);
                 }
             }
             // do not increase frame rate by more than 1 % in order to match a standard rate.