Project Home
Project Home
Documents
Documents
Wiki
Wiki
Discussion Forums
Discussions
Project Information
Project Info
Forum Topic - iPod audio/video lipsync: (4 Items)
   
iPod audio/video lipsync  
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?
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

Re: iPod audio/video lipsync  
Thanks.  The analog video buffer is not really an option for us which means we'll have to switch to analog audio 
whenever the user plays a video.  Am I correct in saying that the only way to switch between digital and analog audio is
 to slay and restart the driver?  
Re: iPod audio/video lipsync  
I suggest you contact QNX support for further assistance. 

Regrads,
Gilles