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| author | Karthick Jeyapal <kjeyapal@akamai.com> | 2018-09-28 10:25:54 +0300 |
|---|---|---|
| committer | Marton Balint <cus@passwd.hu> | 2018-09-30 22:09:12 +0300 |
| commit | c0ee4e0ac2c46bb4904ceec12b7dfa480517e7bf (patch) | |
| tree | 5eff33b0faaac4074d3cb615d044cec8b0ea718b /doc | |
| parent | 449b1dcd7d52b33b148fae95de176b7344bf959d (diff) | |
avdevice/decklink_dec: add option to align capture start time
This option is useful for maintaining input synchronization across N
different hardware devices deployed for 'N-way' redundancy.
The system time of different hardware devices should be synchronized
with protocols such as NTP or PTP, before using this option.
Signed-off-by: Marton Balint <cus@passwd.hu>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/indevs.texi | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/doc/indevs.texi b/doc/indevs.texi index ed2784be9f..9a9cb697d3 100644 --- a/doc/indevs.texi +++ b/doc/indevs.texi @@ -371,6 +371,20 @@ If set to @option{true}, timestamps are forwarded as they are without removing the initial offset. Defaults to @option{false}. +@item timestamp_align +Capture start time alignment in seconds. If set to nonzero, input frames are +dropped till the system timestamp aligns with configured value. +Alignment difference of upto one frame duration is tolerated. +This is useful for maintaining input synchronization across N different +hardware devices deployed for 'N-way' redundancy. The system time of different +hardware devices should be synchronized with protocols such as NTP or PTP, +before using this option. +Note that this method is not foolproof. In some border cases input +synchronization may not happen due to thread scheduling jitters in the OS. +Either sync could go wrong by 1 frame or in a rarer case +@option{timestamp_align} seconds. +Defaults to @samp{0}. + @end table @subsection Examples |