movenc: Allow writing a DASH sidx atom at the start of files

This is mapped to the faststart flag (which in this case
perhaps should be called "shift and write index at the
start of the file"), which for fragmented files will
write a sidx index at the start.

When segmenting DASH into files, there's usually one sidx
at the start of each segment (although it's not clear to me
whether that actually is necessary). When storing all of it
in one file, the MPD doesn't necessarily need to describe
the individual segments, but the offsets of the fragments can be
fetched from one large sidx atom at the start of the file. This
allows creating files for the DASH ISO BMFF on-demand profile.

Signed-off-by: Martin Storsjö <martin@martin.st>

1 files changed, 1 insertions, 0 deletions

diff --git a/libavformat/movenc.h b/libavformat/movenc.h
index 2a40b2fb61..4483b69e04 100644
--- a/libavformat/movenc.h
+++ b/libavformat/movenc.h
@@ -73,6 +73,7 @@ typedef struct MOVFragmentInfo {
     int64_t time;
     int64_t duration;
     int64_t tfrf_offset;
+    int size;
 } MOVFragmentInfo;
 
 typedef struct MOVTrack {