[FFmpeg-user] Selecting/dropping frames without re-encoding

[Mikhail V]

On 5 October 2016 at 18:06, Erik Dobberkau <erik.dobberkau at gmail.com> wrote:
>> Hello,
>>
>> I have a camera recording which is an MXF file and the codec is DNxHD
>> I suppose it is a single-frame codec so literally it is a container of
>> images which are independently stored in the file.
>> Recordings are taken at 50 fps progressive.
>
>
> Hi Michail,
>
> this is a TV standard, 720p50. Nothing exotic.
>
>
>> Now what I want is to extract only half of the frames, so that it becomes
>> 25 fps
>
>
> Why would you want to do that?
> You're getting standard-incompliant video. In other words: This is wrong.


You are right, but what is standard depend on situation, currently the
only working
mode for me is 25 progressive. I know 50 fps would be better of course,
but it does not depend on me but the prescriptions from the broadcaster.