1 files changed, 9 insertions, 8 deletions

diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 2230cad..1008708 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -79,7 +79,7 @@ static const AVOption options[] = {
     { "video_track_timescale", "set timescale of all video tracks", offsetof(MOVMuxContext, video_track_timescale), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
     { "brand",    "Override major brand", offsetof(MOVMuxContext, major_brand),   AV_OPT_TYPE_STRING, {.str = NULL}, .flags = AV_OPT_FLAG_ENCODING_PARAM },
     { "use_editlist", "use edit list", offsetof(MOVMuxContext, use_editlist), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, AV_OPT_FLAG_ENCODING_PARAM},
-    { "fragment_index", "Fragment number of the next fragment", offsetof(MOVMuxContext, fragments), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
+    { "fragment_index", "Fragment number of the next fragment", offsetof(MOVMuxContext, fragments), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
     { "mov_gamma", "gamma value for gama atom", offsetof(MOVMuxContext, gamma), AV_OPT_TYPE_FLOAT, {.dbl = 0.0 }, 0.0, 10, AV_OPT_FLAG_ENCODING_PARAM},
     { NULL },
 };
@@ -4058,7 +4058,7 @@ static int mov_flush_fragment(AVFormatContext *s)
     if (!(mov->flags & FF_MOV_FLAG_FRAGMENT))
         return 0;
 
-    if (mov->fragments == 0) {
+    if (!mov->moov_written) {
         int64_t pos = avio_tell(s->pb);
         uint8_t *buf;
         int buf_size, moov_size;
@@ -4083,7 +4083,7 @@ static int mov_flush_fragment(AVFormatContext *s)
             if (mov->flags & FF_MOV_FLAG_FASTSTART)
                 mov->reserved_moov_pos = avio_tell(s->pb);
             avio_flush(s->pb);
-            mov->fragments++;
+            mov->moov_written = 1;
             return 0;
         }
 
@@ -4094,7 +4094,7 @@ static int mov_flush_fragment(AVFormatContext *s)
         avio_write(s->pb, buf, buf_size);
         av_free(buf);
 
-        mov->fragments++;
+        mov->moov_written = 1;
         mov->mdat_size = 0;
         for (i = 0; i < mov->nb_streams; i++) {
             if (mov->tracks[i].entry)
@@ -4172,12 +4172,13 @@ static int mov_flush_fragment(AVFormatContext *s)
 static int mov_auto_flush_fragment(AVFormatContext *s)
 {
     MOVMuxContext *mov = s->priv_data;
+    int had_moov = mov->moov_written;
     int ret = mov_flush_fragment(s);
     if (ret < 0)
         return ret;
     // If using delay_moov, the first flush only wrote the moov,
     // not the actual moof+mdat pair, thus flush once again.
-    if (mov->fragments == 1 && mov->flags & FF_MOV_FLAG_DELAY_MOOV)
+    if (!had_moov && mov->flags & FF_MOV_FLAG_DELAY_MOOV)
         ret = mov_flush_fragment(s);
     return ret;
 }
@@ -4209,7 +4210,7 @@ int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)
     }
     if (mov->flags & FF_MOV_FLAG_FRAGMENT) {
         int ret;
-        if (mov->fragments > 0 || mov->flags & FF_MOV_FLAG_EMPTY_MOOV) {
+        if (mov->moov_written || mov->flags & FF_MOV_FLAG_EMPTY_MOOV) {
             if (!trk->mdat_buf) {
                 if ((ret = avio_open_dyn_buf(&trk->mdat_buf)) < 0)
                     return ret;
@@ -4367,7 +4368,7 @@ int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)
             trk->frag_start   = pkt->dts;
             trk->start_dts    = 0;
             trk->frag_discont = 0;
-        } else if (pkt->dts && mov->fragments >= 1)
+        } else if (pkt->dts && mov->moov_written)
             av_log(s, AV_LOG_WARNING,
                    "Track %d starts with a nonzero dts %"PRId64", while the moov "
                    "already has been written. Set the delay_moov flag to handle "
@@ -5143,7 +5144,7 @@ static int mov_write_header(AVFormatContext *s)
         !(mov->flags & FF_MOV_FLAG_DELAY_MOOV)) {
         if ((ret = mov_write_moov_tag(pb, mov, s)) < 0)
             return ret;
-        mov->fragments++;
+        mov->moov_written = 1;
         if (mov->flags & FF_MOV_FLAG_FASTSTART)
             mov->reserved_moov_pos = avio_tell(pb);
     }