[FFmpeg-devel] [PATCH] avfilter: add framerate video filter

Paul B Mahol onemda at gmail.com
Sun Aug 30 15:47:06 CEST 2015

On 8/30/15, Andy Furniss <adf.lists at gmail.com> wrote:
> Andy Furniss wrote:
>> Carl Eugen Hoyos wrote:
>>> Robert Krueger <krueger <at> lesspain.de> writes:
>>>> The only other thing I noticed was that the stream seams to be
>>>> marked as interlaced when it comes out of the first il filter,
>>>> which causes warnings like these:
>>>> [Parsed_framerate_1  <at>  0x7fa4e3426080] Interlaced frame found
>>>> - the output will not be correct.
>>> This sounds like an issue to me but we probably need an option for
>>> il to disable changing the interlaced flag if another usecase for
>>> the filter was found.
>> Isn't fields being marked as interlaced correct though?
>> I mean it's not progressive video that is produced, as each field is
>> offset by one line and anything that could process correctly, still
>> needs to know whether a field is top or bottom.
>> I don't know whether the framerate filter can handle fields or not,
>> if it can, there should be code that takes account of top/bottom. If
>> there isn't that code then I guess it really does need de-interlaced
>> progressive full height frames as input.
> Oh, il stacks the fields, I was thinking of the filter that just
> produces fields like mplayer tfields=0 (I never can remember what the
> ffmpeg filter that does the same is called).


> Still seems a bit of a strange way to use the framerate filter - but I
> haven't tested vs yadif.
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