Ideally, there should be A/V sync. As a practical matter for short video clips, the drift is negligible compared to the jitter. Since our common use case for Cupcake is short video clips on mobile devices, we have chosen to ignore both drift and jitter issues.
In the future we will base the video clock off the audio clock. This should keep eliminate long-term clock drift. We will still have some jitter, but that can probably be minimized with some filtering. On Feb 23, 5:50 pm, Andy Quan <[email protected]> wrote: > Dave, > Thanks to your information. > I'd like to know: > > 1. Is it a common used method that there is no a/v sync in camcorder > usage? > 2. You mean if there is sync, it is android rather than OpenCORE who > should take care of it, right? > 3. Is it in your roadmap to make sync happen? I guess monotonic system > still brings no sync. > > Correct me if I made any misunderstanding. > > On Tue, Feb 24, 2009 at 7:06 AM, Dave Sparks <[email protected]>wrote: > > > > > > > Since the typical use case for mobile is short clips, we haven't > > bothered with sync yet. We did recently make a change to have the > > video base its timestamp on the monotonic system clock, but I don't > > think that change is pushed out yet. > > > On Feb 23, 8:14 am, Andy Quan <[email protected]> wrote: > > > Hi, > > > Anybody can shed light on where I can find a/v sync code in > > PVMediaRecorder? > > > I find in opencore/android/ that audio input takes audio sample number as > > > its time stamp while camera input takes OsclTickCount offset for a > > > reference. Is there supposed to be a synchronization on these 2 clocks > > just > > > like what it is in player? If not, is it meant to be 2 seperate clocking > > in > > > PV? > > > > -- > > > Thanks, > > > Andy > > -- > Thanks, > Andy --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "android-framework" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-framework?hl=en -~----------~----~----~----~------~----~------~--~---
