[Ardour-Users] "Extract LTC from audio and align video" menu option missing from "Transcode/Import Video file" popup

David Kastrup dak at gnu.org
Fri Apr 6 01:27:01 PDT 2018

"Chris Caudle" <chris at chriscaudle.org> writes:

> On Thu, April 5, 2018 2:30 pm, robertlazarski . wrote:
>> I was not selecting "file timestamp", which explains why I was not seeing
>> the timecode I was expecting in Xjadeo. This option fixed that problem.
> OK, I think you are getting close.  I imported the file you created,
> 180404-T004.WAV, and when I selected import at file timestamp it was moved
> to 6:05:27 as expected.
> I noticed in your screen capture that there was a message which flashed up
> about sample rate conversion.  Just for future reference you will probably
> want to set your session sample rate to 48k when working with audio for
> video, that is the standard sample rate for essentially all video formats.

Which is interesting because 44100Hz was chosen because it had 294*3
samples per 50Hz (half-)frame, 245*3 samples per 60Hz (half-)frame.

But of course, with separately coded/packaged video and audio streams
(and video being no longer strongly associated with PAL and NTSC formats
and resolutions), the interest in clean ratios has declined.

David Kastrup

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