fftools/ffmpeg_mux: make ts_copy_start private to muxing code

It is no longer used outside of ffmpeg_mux*

fftools/ffmpeg.h

@@ -598,11 +598,6 @@ typedef struct OutputStream {
     /* dts of the last packet sent to the muxing queue, in AV_TIME_BASE_Q */
     int64_t last_mux_dts;
 
-    // timestamp from which the streamcopied streams should start,
-    // in AV_TIME_BASE_Q;
-    // everything before it should be discarded
-    int64_t ts_copy_start;
-
     // the timebase of the packets sent to the muxer
     AVRational mux_timebase;
     AVRational enc_timebase;

fftools/ffmpeg_mux.c

@@ -400,8 +400,8 @@ void of_streamcopy(OutputStream *ost, const AVPacket *pkt, int64_t dts)
     if (!ost->streamcopy_started) {
         if (!ost->copy_prior_start &&
             (pkt->pts == AV_NOPTS_VALUE ?
-             dts < ost->ts_copy_start :
-             pkt->pts < av_rescale_q(ost->ts_copy_start, AV_TIME_BASE_Q, pkt->time_base)))
+             dts < ms->ts_copy_start :
+             pkt->pts < av_rescale_q(ms->ts_copy_start, AV_TIME_BASE_Q, pkt->time_base)))
             return;
 
         if (of->start_time != AV_NOPTS_VALUE && dts < of->start_time)

fftools/ffmpeg_mux.h

@@ -60,6 +60,11 @@ typedef struct MuxStream {
     /* Threshold after which max_muxing_queue_size will be in effect */
     size_t muxing_queue_data_threshold;
 
+    // timestamp from which the streamcopied streams should start,
+    // in AV_TIME_BASE_Q;
+    // everything before it should be discarded
+    int64_t ts_copy_start;
+
     /* dts of the last packet sent to the muxer, in the stream timebase
      * used for making up missing dts values */
     int64_t last_mux_dts;

fftools/ffmpeg_mux_init.c

@@ -841,6 +841,8 @@ static void new_stream_subtitle(Muxer *mux, const OptionsContext *o,
 static int streamcopy_init(const Muxer *mux, const OptionsContext *o,
                            OutputStream *ost)
 {
+    MuxStream           *ms         = ms_from_ost(ost);
+
     const InputStream   *ist        = ost->ist;
     const InputFile     *ifile      = input_files[ist->file_index];
 
@@ -907,11 +909,11 @@ static int streamcopy_init(const Muxer *mux, const OptionsContext *o,
         ost->st->duration = av_rescale_q(ist->st->duration, ist->st->time_base, ost->st->time_base);
 
     if (!ost->copy_prior_start) {
-        ost->ts_copy_start = (mux->of.start_time == AV_NOPTS_VALUE) ?
-                             0 : mux->of.start_time;
+        ms->ts_copy_start = (mux->of.start_time == AV_NOPTS_VALUE) ?
+                            0 : mux->of.start_time;
         if (copy_ts && ifile->start_time != AV_NOPTS_VALUE) {
-            ost->ts_copy_start = FFMAX(ost->ts_copy_start,
-                                       ifile->start_time + ifile->ts_offset);
+            ms->ts_copy_start = FFMAX(ms->ts_copy_start,
+                                      ifile->start_time + ifile->ts_offset);
         }
     }