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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/ffmpeg.texi | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi index 81e04f6983..592c4b4393 100644 --- a/doc/ffmpeg.texi +++ b/doc/ffmpeg.texi @@ -1342,6 +1342,22 @@ List all hardware acceleration components enabled in this build of ffmpeg. Actual runtime availability depends on the hardware and its suitable driver being installed. +@item -fix_sub_duration_heartbeat[:@var{stream_specifier}] +Set a specific output video stream as the heartbeat stream according to which +to split and push through currently in-progress subtitle upon receipt of a +random access packet. + +This lowers the latency of subtitles for which the end packet or the following +subtitle has not yet been received. As a drawback, this will most likely lead +to duplication of subtitle events in order to cover the full duration, so +when dealing with use cases where latency of when the subtitle event is passed +on to output is not relevant this option should not be utilized. + +Requires @option{-fix_sub_duration} to be set for the relevant input subtitle +stream for this to have any effect, as well as for the input subtitle stream +having to be directly mapped to the same output in which the heartbeat stream +resides. + @end table @section Audio Options |