[FFmpeg-devel] [PATCH]Write total number of tracks to m4a

[Carl Eugen Hoyos]

Hi!

Attached patch fixes ticket #2157 for me.

Please comment, Carl Eugen
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diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 42ec3f2..1b3cebb 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -2022,6 +2022,12 @@ static int mov_write_trkn_tag(AVIOContext *pb, MOVMuxContext *mov,
     AVDictionaryEntry *t = av_dict_get(s->metadata, "track", NULL, 0);
     int size = 0, track = t ? atoi(t->value) : 0;
     if (track) {
+        int i = 1, tracks = 0;
+        while (t->value[i])
+            if (t->value[i++] == '/') {
+                tracks = atoi(&t->value[i]);
+                break;
+            }
         avio_wb32(pb, 32); /* size */
         ffio_wfourcc(pb, "trkn");
         avio_wb32(pb, 24); /* size */
@@ -2030,7 +2036,7 @@ static int mov_write_trkn_tag(AVIOContext *pb, MOVMuxContext *mov,
         avio_wb32(pb, 0);
         avio_wb16(pb, 0);        // empty
         avio_wb16(pb, track);    // track number
-        avio_wb16(pb, 0);        // total track number
+        avio_wb16(pb, tracks);   // total track number
         avio_wb16(pb, 0);        // empty
         size = 32;
     }