no more hslv format ?

[Dave Lambley]

On 5 May 2018 at 00:29, RS <richard22j at zoho.com> wrote:
> On 04/05/18 23:50, Dave Lambley wrote:
>
>>
>> They would remove the interlace to bring the framerate to 50fps before
>> encoding. There are many methods of doing so, ffmpeg can do this for
>> example.
>>
> This article
>
> https://superuser.com/questions/253691/how-to-convert-108050i-72050p-using-ffmpeg
>
> says, "Just like interlacing progressive content divides each frame into 2
> fields, thus doubling the frame rate, the common method of deinterlacing is
> to combine each 2 fields into 1 frame, which reduces the rate by 2, thus
> taking 50 into 25fps. You can of course double each final frame, but that
> does not provide any benefit."
>
> Do you disagree?

eg., https://ffmpeg.org/ffmpeg-filters.html#bwdif (and other) filters
can give you good quality 50fps frames, without duplication, from
interlaced 25fps video. I have no idea what the BBC use, but they have
plenty of choice.

Dave