[FFmpeg-user] ffmpeg architecture question #2

Carl Eugen Hoyos ceffmpeg at gmail.com
Fri Apr 24 20:22:21 EEST 2020

> Am 24.04.2020 um 11:10 schrieb Mark Filipak <markfilipak.windows+ffmpeg at gmail.com>:
> I've been told that, for soft telecined video the decoder is fully compliant and therefore outputs 30fps

(“fps” is highly ambiguous in this sentence.)

This is not correct.
I believe I told you some time ago that this is not how the decoder behaves. I believe such a behaviour would not make sense for FFmpeg (because you cannot connect FFmpeg’s output to an NTSC CRT). The telecine filter would not work at all if above were the case.
Or in other words: FFmpeg outputs approximately 24 frames per second for typical soft-telecined program streams.

The only thing FFmpeg does to be “compliant” is to forward the correct time base.

Carl Eugen

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