lavf/movenc: Allow to disable writing the timecode track.

Fixes ticket #5492.

doc/muxers.texi

@@ -884,6 +884,9 @@ the new default-base-is-moof flag instead. This flag is new from
 14496-12:2012. This may make the fragments easier to parse in certain
 circumstances (avoiding basing track fragment location calculations
 on the implicit end of the previous track fragment).
+@item -write_tmcd
+Specify @code{on} to force writing a timecode track, @code{off} to disable it
+and @code{auto} to write a timecode track only for mov and mp4 output (default).
 @end table
 
 @subsection Example

libavformat/movenc.c

@@ -90,6 +90,7 @@ static const AVOption options[] = {
     { "encryption_key", "The media encryption key (hex)", offsetof(MOVMuxContext, encryption_key), AV_OPT_TYPE_BINARY, .flags = AV_OPT_FLAG_ENCODING_PARAM },
     { "encryption_kid", "The media encryption key identifier (hex)", offsetof(MOVMuxContext, encryption_kid), AV_OPT_TYPE_BINARY, .flags = AV_OPT_FLAG_ENCODING_PARAM },
     { "use_stream_ids_as_track_ids", "use stream ids as track ids", offsetof(MOVMuxContext, use_stream_ids_as_track_ids), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
+    { "write_tmcd", "force or disable writing tmcd", offsetof(MOVMuxContext, write_tmcd), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, AV_OPT_FLAG_ENCODING_PARAM},
     { NULL },
 };
 
@@ -2312,7 +2313,7 @@ static int mov_write_minf_tag(AVFormatContext *s, AVIOContext *pb, MOVMuxContext
     } else if (track->tag == MKTAG('r','t','p',' ')) {
         mov_write_hmhd_tag(pb);
     } else if (track->tag == MKTAG('t','m','c','d')) {
-        if (track->mode == MODE_MP4)
+        if (track->mode != MODE_MOV)
             mov_write_nmhd_tag(pb);
         else
             mov_write_gmhd_tag(pb, track);
@@ -5539,7 +5540,8 @@ static int mov_write_header(AVFormatContext *s)
         }
     }
 
-    if (mov->mode == MODE_MOV || mov->mode == MODE_MP4) {
+    if (   mov->write_tmcd == -1 && (mov->mode == MODE_MOV || mov->mode == MODE_MP4)
+        || mov->write_tmcd == 1) {
         tmcd_track = mov->nb_streams;
 
         /* +1 tmcd track for each video stream with a timecode */

libavformat/movenc.h

@@ -219,6 +219,7 @@ typedef struct MOVMuxContext {
 
     int use_stream_ids_as_track_ids;
     int track_ids_ok;
+    int write_tmcd;
 } MOVMuxContext;
 
 #define FF_MOV_FLAG_RTP_HINT              (1 <<  0)