[mythtv] [PATCH] Video delay filter

Endaf Jones jonese at zener.com
Sat May 7 13:17:38 UTC 2005

I would also like something like this as I have a video scan converted 
that adds delay too (perahps 1/4 second).

# Endaf

Kevin Kuphal wrote:

> Ed Wildgoose wrote:
>> Bryce Poole wrote:
>>> When I first got my Dish Network satellite, I immediately noticed that
>>> the video was leading the audio.  So when myth was up and running I
>>> wrote this filter to fix the problem and slow down the video.
>>> The basic idea is that the filter gets passed a size from the TV
>>> Playback screen along the lines of "delay=10" which translates into a
>>> 10 frame delay.  The filter then creates a dynamic ring buffer to hold
>>> 10 frames.  Each time the filter is called the oldest frame is
>>> returned.
>> Hi, I actually need something similar to this myself because I have 
>> some serious DSP processing enabled which causes delays to the audio 
>> signal
>> However, I was going to implement this simply in the audio routines 
>> by changing the audio timestamp which is returned (forget the call 
>> name).  Just change this to be forwards or backwards by the required 
>> amount and we should achieve the desired result with very little code.
>> I would recommend that we try this before putting in the filters method?
> I was thinking along the same lines (on my todo list) with an OSD 
> option for increasing/decreasing the audio delay as every blue moon I 
> get a recording that lags in audio for a second or so throughout the 
> duration of the show.
> Kevin
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