fftools/ffmpeg_filter: use correct timebase for filter EOF timestamp

It does not need to be equal to demuxer timebase.

fftools/ffmpeg.c

@@ -1320,12 +1320,9 @@ static int transcode_subtitles(InputStream *ist, const AVPacket *pkt,
 static int send_filter_eof(InputStream *ist)
 {
     int i, ret;
-    /* TODO keep pts also in stream time base to avoid converting back */
-    int64_t pts = av_rescale_q_rnd(ist->pts, AV_TIME_BASE_Q, ist->st->time_base,
-                                   AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX);
 
     for (i = 0; i < ist->nb_filters; i++) {
-        ret = ifilter_send_eof(ist->filters[i], pts);
+        ret = ifilter_send_eof(ist->filters[i], ist->pts, AV_TIME_BASE_Q);
         if (ret < 0)
             return ret;
     }

fftools/ffmpeg.h

@@ -788,7 +788,7 @@ int init_complex_filtergraph(FilterGraph *fg);
 void sub2video_update(InputStream *ist, int64_t heartbeat_pts, AVSubtitle *sub);
 
 int ifilter_send_frame(InputFilter *ifilter, AVFrame *frame, int keep_reference);
-int ifilter_send_eof(InputFilter *ifilter, int64_t pts);
+int ifilter_send_eof(InputFilter *ifilter, int64_t pts, AVRational tb);
 
 int ifilter_parameters_from_codecpar(InputFilter *ifilter, AVCodecParameters *par);
 int ifilter_has_all_input_formats(FilterGraph *fg);

fftools/ffmpeg_filter.c

@@ -1454,13 +1454,17 @@ int reap_filters(int flush)
     return 0;
 }
 
-int ifilter_send_eof(InputFilter *ifilter, int64_t pts)
+int ifilter_send_eof(InputFilter *ifilter, int64_t pts, AVRational tb)
 {
+    InputFilterPriv *ifp = ifp_from_ifilter(ifilter);
     int ret;
 
     ifilter->eof = 1;
 
     if (ifilter->filter) {
+        pts = av_rescale_q_rnd(pts, tb, ifp->time_base,
+                               AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX);
+
         ret = av_buffersrc_close(ifilter->filter, pts, AV_BUFFERSRC_FLAG_PUSH);
         if (ret < 0)
             return ret;