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movenc: Add a flag for using default-base-is-moof in tfhd atoms

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Similarly to the omit_tfhd_offset flag added in e7bf085b, this
avoids writing absolute byte positions to the file, making them
more easily streamable.

This is a new feature from 14496-12:2012, so application support
isn't necessarily too widespread yet (support for it in libav was
added in 20f95f21f in July 2014).

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö
2014-10-29 11:53:21 +02:00
parent 600d5ee6b1
commit cf589faa5b
4 changed files with 20 additions and 4 deletions
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7
doc/muxers.texi
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@@ -340,6 +340,13 @@ cause failures when the file is reprocessed with certain tagging programs.
@item -movflags omit_tfhd_offset
Do not write any absolute base_data_offset in tfhd atoms. This avoids
tying fragments to absolute byte positions in the file/streams.
@item -movflags default_base_moof
Similarly to the omit_tfhd_offset, this flag avoids writing the
absolute base_data_offset field in tfhd atoms, but does so by using
the new default-base-is-moof flag instead. This flag is new from
14496-12:2012. This may make the fragments easier to parse in certain
circumstances (avoiding basing track fragment location calculations
on the implicit end of the previous track fragment).
@end table
Smooth Streaming content can be pushed in real time to a publishing