[FFmpeg-cvslog] avformat/movenc: allow ISMV timescale to be user-set

Gyan Doshi git at videolan.org
Sat Jan 25 18:07:02 EET 2020


ffmpeg | branch: master | Gyan Doshi <ffmpeg at gyani.pro> | Fri Jan  4 11:03:47 2019 +0530| [75d1d9eb349462bf72ed38004c06a53e0b79173c] | committer: Gyan Doshi

avformat/movenc: allow ISMV timescale to be user-set

As per the PIFF standard, the timescale of 10000000
is recommended but not mandatory, so don't override
the user-set value.

A warning is shown for non-recommended values.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=75d1d9eb349462bf72ed38004c06a53e0b79173c
---

 libavformat/movenc.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index fb44ee2c71..5bf434c325 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -6389,6 +6389,8 @@ static int mov_init(AVFormatContext *s)
             }
             if (mov->video_track_timescale) {
                 track->timescale = mov->video_track_timescale;
+                if (mov->mode == MODE_ISM && mov->video_track_timescale != 10000000)
+                    av_log(s, AV_LOG_WARNING, "Warning: some tools, like mp4split, assume a timescale of 10000000 for ISMV.\n");
             } else {
                 track->timescale = st->time_base.den;
                 while(track->timescale < 10000)
@@ -6486,10 +6488,14 @@ static int mov_init(AVFormatContext *s)
         }
         if (!track->height)
             track->height = st->codecpar->height;
-        /* The ism specific timescale isn't mandatory, but is assumed by
-         * some tools, such as mp4split. */
-        if (mov->mode == MODE_ISM)
-            track->timescale = 10000000;
+        /* The Protected Interoperable File Format (PIFF) standard, used by ISMV recommends but
+           doesn't mandate a track timescale of 10,000,000. The muxer allows a custom timescale
+           for video tracks, so if user-set, it isn't overwritten */
+        if (mov->mode == MODE_ISM &&
+            (st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ||
+            (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && !mov->video_track_timescale))) {
+             track->timescale = 10000000;
+        }
 
         avpriv_set_pts_info(st, 64, 1, track->timescale);
 



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