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| author | Nicolas George <nicolas.george@normalesup.org> | 2012-03-03 15:56:11 +0100 |
|---|---|---|
| committer | Nicolas George <nicolas.george@normalesup.org> | 2012-04-04 15:22:44 +0200 |
| commit | 12292f35a3affe1265d63acba98f651cf82ae233 (patch) | |
| tree | 7b91c662cd13621edd676c4367a6cdf4cccd28dd /doc/indevs.texi | |
| parent | 8a9ae37feef5b09332222045a3d9ad948cdcc445 (diff) | |
| download | ffmpeg-12292f35a3affe1265d63acba98f651cf82ae233.tar.gz | |
v4l2: allow to convert monotonic timestamps.
Diffstat (limited to 'doc/indevs.texi')
| -rw-r--r-- | doc/indevs.texi | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/doc/indevs.texi b/doc/indevs.texi index f41c1cbb51..e699e11f42 100644 --- a/doc/indevs.texi +++ b/doc/indevs.texi @@ -520,6 +520,13 @@ supported using @command{-list_formats all} for Video4Linux2 devices. Some usage examples of the video4linux2 devices with ffmpeg and ffplay: +The time base for the timestamps is 1 microsecond. Depending on the kernel +version and configuration, the timestamps may be derived from the real time +clock (origin at the Unix Epoch) or the monotonic clock (origin usually at +boot time, unaffected by NTP or manual changes to the clock). The +@option{-timestamps abs} or @option{-ts abs} option can be used to force +conversion into the real time clock. + Note that if FFmpeg is build with v4l-utils support ("--enable-libv4l2" option), it will always be used. @example |