[FFmpeg-devel] Bug in FFMPEG video filter TINTERLACE needs fixing

[Paul B Mahol]

On 7/11/20, Ben Hutchinson <benhut1 at gmail.com> wrote:
> I was reading it directly from the official FFMPEG website.
> https://ffmpeg.org/ffmpeg-filters.html
> All the info about the TINTERLACE filter I got from reading the info there.
>

OK, lets try again, where have you read that first frame is always an
odd frame, one with 1 number.
FFmpeg counts from 0.

> On Fri, Jul 10, 2020 at 2:14 AM Paul B Mahol <onemda at gmail.com> wrote:
>
>> On 7/8/20, Ben Hutchinson <benhut1 at gmail.com> wrote:
>> > According to the documentation on the TINTERLACE video filter, the
>> > filter
>> > mode called MERGEX2 will "Move odd frames into the upper field, even
>> > into
>> > the lower field, generating a double height frame at same frame rate."
>> But
>> > it doesn't do this, at least in some cases (not sure about all cases).
>> The
>> > first frame in a sequence should be considered frame one (an odd frame)
>> for
>>
>> Where is this written?
>>
>> > the purpose of this interlacing algorithm. However, that is not what's
>> > happening in my experience. At least with raw video (using "-f
>> > rawvideo")
>> > it's treating the first frame as frame zero (an even frame) and thus my
>> > first frame (which contains top-field data) ends up getting put into the
>> > bottom-field of the output video, and this is messing up the output.
>> Please
>> > fix this.
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