avformat: Export ticks_per_frame in st->codec

Fixes regressions with stream copy and output timebase/fps being twice as fine as needed
Makes the timebase and ticks per frame handled identical which should make the
code easier to understand and work with. It does not solve the problem without
st->codec access

Suggested-by: Hendrik Leppkes
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/utils.c

@@ -3825,8 +3825,10 @@ FF_DISABLE_DEPRECATION_WARNINGS
             st->codec->height = st->internal->avctx->height;
         }
 
-        if (st->codec->codec_tag != MKTAG('t','m','c','d'))
+        if (st->codec->codec_tag != MKTAG('t','m','c','d')) {
             st->codec->time_base = st->internal->avctx->time_base;
+            st->codec->ticks_per_frame = st->internal->avctx->ticks_per_frame;
+        }
         st->codec->framerate = st->avg_frame_rate;
 
         if (st->internal->avctx->subtitle_header) {

tests/ref/fate/copy-trac4914

-84316a64b609052d9974891686fbf607 *tests/data/fate/copy-trac4914.mxf
-566329 tests/data/fate/copy-trac4914.mxf
+8868ae16d99ed03916e9dc7105285471 *tests/data/fate/copy-trac4914.mxf
+560697 tests/data/fate/copy-trac4914.mxf

tests/ref/fate/copy-trac4914-avi

-e948f10c90f526ae2c0cf234e1f54128 *tests/data/fate/copy-trac4914-avi.avi
-480886 tests/data/fate/copy-trac4914-avi.avi
+26e4202638bc384b82d2b5eb4d33a5f0 *tests/data/fate/copy-trac4914-avi.avi
+479494 tests/data/fate/copy-trac4914-avi.avi