---
doc/muxers.texi | 4 ++++
libavformat/movenc.c | 12 ++++++++++--
libavformat/movenc.h | 1 +
3 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/doc/muxers.texi b/doc/muxers.texi
index f1cc6f5fee..ca10741900 100644
--- a/doc/muxers.texi
+++ b/doc/muxers.texi
@@ -1325,6 +1325,10 @@ more efficient), but with this option set, the muxer
writes one moof/mdat
pair for each track, making it easier to separate tracks.
This option is implicitly set when writing ismv (Smooth Streaming) files.
+@item -movflags skip_sidx
+Skip writing of sidx atom. When bitrate overhead due to sidx atom is high,
+this option could be used for cases where sidx atom is not mandatory.
+When global_sidx flag is enabled, this option will be ignored.
@item -movflags faststart
Run a second pass moving the index (moov atom) to the beginning of the file.
This operation can take a while, and will not work in various situations such
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 6dab5193b0..3781a32895 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -75,6 +75,7 @@ static const AVOption options[] = {
{ "frag_discont", "Signal that the next fragment is discontinuous from earlier
ones", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_FRAG_DISCONT}, INT_MIN, INT_MAX,
AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
{ "delay_moov", "Delay writing the initial moov until the first fragment is cut, or
until the first fragment flush", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_DELAY_MOOV}, INT_MIN,
INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
{ "global_sidx", "Write a global sidx index at the start of the file", 0,
AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_GLOBAL_SIDX}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM,
"movflags" },
+ { "skip_sidx", "Skip writing of sidx atom", 0, AV_OPT_TYPE_CONST, {.i64 =
FF_MOV_FLAG_SKIP_SIDX}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
{ "write_colr", "Write colr atom (Experimental, may be renamed or changed, do not use
from scripts)", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_WRITE_COLR}, INT_MIN, INT_MAX,
AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
{ "write_gama", "Write deprecated gama atom", 0, AV_OPT_TYPE_CONST, {.i64 =
FF_MOV_FLAG_WRITE_GAMA}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
{ "use_metadata_tags", "Use mdta atom for metadata.", 0, AV_OPT_TYPE_CONST, {.i64 =
FF_MOV_FLAG_USE_MDTA}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
@@ -4603,7 +4604,8 @@ static int mov_write_moof_tag(AVIOContext *pb,
MOVMuxContext *mov, int tracks,
mov_write_moof_tag_internal(avio_buf, mov, tracks, 0);
moof_size = ffio_close_null_buf(avio_buf);
- if (mov->flags & FF_MOV_FLAG_DASH && !(mov->flags & FF_MOV_FLAG_GLOBAL_SIDX))
+ if (mov->flags & FF_MOV_FLAG_DASH &&
+ !(mov->flags & (FF_MOV_FLAG_GLOBAL_SIDX | FF_MOV_FLAG_SKIP_SIDX)))
mov_write_sidx_tags(pb, mov, tracks, moof_size + 8 + mdat_size);
if (mov->write_prft > MOV_PRFT_NONE && mov->write_prft < MOV_PRFT_NB)
@@ -5422,7 +5424,8 @@ int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)
* the next fragment. This means the cts of the first sample must
* be the same in all fragments, unless end_pts was updated by
* the packet causing the fragment to be written. */
- if ((mov->flags & FF_MOV_FLAG_DASH && !(mov->flags &
FF_MOV_FLAG_GLOBAL_SIDX)) ||
+ if ((mov->flags & FF_MOV_FLAG_DASH &&
+ !(mov->flags & (FF_MOV_FLAG_GLOBAL_SIDX |
FF_MOV_FLAG_SKIP_SIDX))) ||
mov->mode == MODE_ISM)
pkt->pts = pkt->dts + trk->end_pts -
trk->cluster[trk->entry].dts;
} else {
@@ -6067,6 +6070,11 @@ static int mov_init(AVFormatContext *s)
s->flags &= ~AVFMT_FLAG_AUTO_BSF;
}
+ if (mov->flags & FF_MOV_FLAG_GLOBAL_SIDX && s->flags & FF_MOV_FLAG_SKIP_SIDX) {
+ av_log(s, AV_LOG_WARNING, "Global SIDX enabled; Ignoring skip_sidx
option\n");
+ s->flags &= ~FF_MOV_FLAG_SKIP_SIDX;
+ }
+
