[FFmpeg-user] ffmpeg architecture question #2

Mark Filipak markfilipak.windows+ffmpeg at gmail.com
Sat Apr 25 05:19:50 EEST 2020

On 04/24/2020 01:22 PM, Carl Eugen Hoyos wrote:
>> 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 beg your pardon, Carl Eugen. I thought you said that the decoders are fully compliant and 
therefore produce interlaced fields.

> 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.

By "correct time base" you mean 24/1.001, correct?

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