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| author | Jan Ekström <jeebjp@gmail.com> | 2018-07-26 02:51:38 +0300 |
|---|---|---|
| committer | Jan Ekström <jeebjp@gmail.com> | 2018-08-24 21:00:05 +0300 |
| commit | 1931761f18cda3756a27087c366270c38160c754 (patch) | |
| tree | ca75d01e0d809ccf21ebcb34eb5366d6c920ea75 /doc/muxers.texi | |
| parent | 701aca55fd1186e440a5b208374d4754c9181f80 (diff) | |
| download | ffmpeg-1931761f18cda3756a27087c366270c38160c754.tar.gz | |
avformat/movenc: implicitly enable negative CTS offsets for ismv
ISMV lacks any sort of edit list support, as well as tfxd is
effectively the PTS of the fragment for most intents and purposes.
Thus, if b-frames are requested without negative CTS offsets you
end up with N frames' worth of delay (tfxd PTS plus the CTS offset
of the first sample). Negative CTS offsets enable the first sample
to have CTS=DTS, and thus a/v desync due to b-frame reorder delay
is avoided.
Diffstat (limited to 'doc/muxers.texi')
| -rw-r--r-- | doc/muxers.texi | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/muxers.texi b/doc/muxers.texi index 33f1f7bbaf..268c152023 100644 --- a/doc/muxers.texi +++ b/doc/muxers.texi @@ -1344,6 +1344,8 @@ be negative. This enables the initial sample to have DTS/CTS of zero, and reduces the need for edit lists for some cases such as video tracks with B-frames. Additionally, eases conformance with the DASH-IF interoperability guidelines. + +This option is implicitly set when writing ismv (Smooth Streaming) files. @item -write_prft Write producer time reference box (PRFT) with a specified time source for the NTP field in the PRFT box. Set value as @samp{wallclock} to specify timesource |