Merge remote-tracking branch 'cus/stable'

* cus/stable:
  ffplay: increase maximum frame duration to 1 hour for streams without TS discontinuity
  ffplay: fix updating external clock after seeking
  ffplay: disallow seeking before the start of the file
Merged-by: Michael Niedermayer <michaelni@gmx.at>

ffplay.c

@@ -234,6 +234,7 @@ typedef struct VideoState {
     double video_current_pts;       // current displayed pts (different from video_clock if frame fifos are used)
     double video_current_pts_drift; // video_current_pts - time (av_gettime) at which we updated video_current_pts - used to have running video pts
     int64_t video_current_pos;      // current displayed file pos
+    double max_frame_duration;      // maximum duration of a frame - above this, we consider the jump a timestamp discontinuity
     VideoPicture pictq[VIDEO_PICTURE_QUEUE_SIZE];
     int pictq_size, pictq_rindex, pictq_windex;
     SDL_mutex *pictq_mutex;
@@ -1318,7 +1319,7 @@ retry:
 
             /* compute nominal last_duration */
             last_duration = vp->pts - is->frame_last_pts;
-            if (last_duration > 0 && last_duration < 10.0) {
+            if (last_duration > 0 && last_duration < is->max_frame_duration) {
                 /* if duration of the last frame was sane, update last_duration in video state */
                 is->frame_last_duration = last_duration;
             }
@@ -2557,6 +2558,8 @@ static int read_thread(void *arg)
     if (seek_by_bytes < 0)
         seek_by_bytes = !!(ic->iformat->flags & AVFMT_TS_DISCONT);
 
+    is->max_frame_duration = (ic->iformat->flags & AVFMT_TS_DISCONT) ? 10.0 : 3600.0;
+
     /* if seeking requested, we execute it */
     if (start_time != AV_NOPTS_VALUE) {
         int64_t timestamp;
@@ -2669,8 +2672,13 @@ static int read_thread(void *arg)
                     packet_queue_flush(&is->videoq);
                     packet_queue_put(&is->videoq, &flush_pkt);
                 }
+                if (is->seek_flags & AVSEEK_FLAG_BYTE) {
+                   //FIXME: use a cleaner way to signal obsolete external clock...
+                   update_external_clock_pts(is, (double)AV_NOPTS_VALUE);
+                } else {
+                   update_external_clock_pts(is, seek_target / (double)AV_TIME_BASE);
+                }
             }
-            update_external_clock_pts(is, (seek_target + ic->start_time) / (double)AV_TIME_BASE);
             is->seek_req = 0;
             eof = 0;
         }
@@ -2984,6 +2992,8 @@ static void event_loop(VideoState *cur_stream)
                     } else {
                         pos = get_master_clock(cur_stream);
                         pos += incr;
+                        if (cur_stream->ic->start_time != AV_NOPTS_VALUE && pos < cur_stream->ic->start_time / (double)AV_TIME_BASE)
+                            pos = cur_stream->ic->start_time / (double)AV_TIME_BASE;
                         stream_seek(cur_stream, (int64_t)(pos * AV_TIME_BASE), (int64_t)(incr * AV_TIME_BASE), 0);
                     }
                 break;