Gilles Roy
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Re: iPod audio/video lipsync
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Gilles Roy
04/30/2010 2:18 PM
post53329
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Re: iPod audio/video lipsync
On 10-04-30 2:03 PM, "Steven Lougheed" <community-noreply@qnx.com> wrote:
> When playing analog video out from the iPod, we see that the digital audio is
> delayed by the amount set in the io-audio buffers so that we see a delay of ~2
> seconds between the video and audio. Is there a setting to account for this
> delay or some other way to get the video and audio to align?
On the command line you can specific a video delay for each different sample
rate. For example, you could start io-fs-media -dipod with
"...,darates=32000/2000:44100/2000:48000/2000,etc..."
That for example would specific a video delay of 2 seconds for the smaple
rates mentioned above. The issue is that Apple has never implemented video
delay in any of its iPod Touch or iPhone devices, so this will only work on
some classics and nanos. In a sense, this feature is not usable unless *all*
iPods support this!
Some generic solutions to sync video with audio are:
-> Use analog audio
-> Buffer and delay the video at the point of capture (i.e. when it first
comes into your system)
Regards,
Gilles
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