Conform framerate

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Conform framerate

Postby esr1 » 18 Nov 2016, 18:59

The last weeks I ve been trying to figure out some QT Atom
manipulation. I am trying to achieve the following: Conform framerates
from 23 and 24 to 25fps within a Quicktime container/atomheader. As
you might know, the one tool that did the job (at least manually) was
Cinema Tools. It still works, but as I am trying to get this automated
and Cinema Tools is not scriptable nor is it still officially
available.

Can you help here?

Thanks
esr1
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Re: Conform framerate

Postby jeschot » 18 Nov 2016, 19:00

I can write a command line utility for that.
That would be a nice test of my new Quicktime framework.

Do you want to conform video files only, or video + sound? In the latter case the sound has to be scaled to match the video.
Same for timecode etc.

Jan E.
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Re: Conform framerate

Postby esr1 » 18 Nov 2016, 19:01

Yes I would like to conform both: video and audio to keep the
synchronicity. ( in cinematools: resulting in higher samplerate for
the audiotracks -> that s ok ) TimecodeTracks could even be removed,
as some encoders have issues with conformed timecode tracks. No CC or
Subtitles included in the Quicktime neither.
esr1
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Re: Conform framerate

Postby jeschot » 18 Nov 2016, 19:02

Basically, conforming this way avoids video resampling at the cost of audio resampling and a change in speed.
And it's fast of course.
High quality video resampling is slow. Compressor can do it. I don't know about AVFoundation.
My app JES Deinterlacer can do frame rate conversion at medium quality.

I have written a command line tool called JES Framerate Converter that can do conversion between 23.976,24 and 25 fps, also between 29.97 and 30 fps, as well as 59.94 and 60 fps.
Frame durations must be constant!
In the future this will be part of Deinterlacer (nothing to do with interlace, definitely with standards conversion).
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