Converting PAL to NTSC

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Ambient22
Posts: 2
Joined: Thu Jul 11, 2013 11:58 am

Converting PAL to NTSC

Post by Ambient22 »

Usually films that are shot at a rate of 24fps are converted to
PAL's 25fps by simply speeding them up; no frames are added.
This results in a shorter playtime and an increase in the pitch
of the sound.

So to convert to NTSC's 24fps (24000/1001), all we have to do
is slow everything down; we don't have to change the number of
frames.

Here's a method that works well for me. On ffmpeg's command line
the following appears twice---once before the input file and once
before the output file:

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-r ntsc-film
To slow down the audio, add this to the audio filters:

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atempo=0.959040959040959
That's all there is to it.

Ambient22
Posts: 2
Joined: Thu Jul 11, 2013 11:58 am

Re: Converting PAL to NTSC

Post by Ambient22 »

In the ffmpeg mailing list, an expert said that this is the preferred way.

Put this on the command-line before the output file:

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-r ntsc-film
Add this to the video filters:

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setpts=1.04270833*PTS
Add this to the audio filters:

Code: Select all

atempo=0.95904096

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