[FFmpeg-user] DV to bob deinterlaced HEVC

[adam smith]

25fps vs 50fps difference is there but not so great as I expected.

You might find that ffmpeg is duplicating each deinterlaced frame to output 50fps from the 25fps source. If you use yadif filter and configure to output a frame per field of interlaced source the resulting motion is dramatically improved at the expense of vertical resolution. 
Depending on the content type this option might be preferable. 

Thanks
Adam

> On 13 Nov 2020, at 19:40, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
> 
> Am Fr., 13. Nov. 2020 um 10:44 Uhr schrieb Matti Haveri
> <matti.haveri at gmail.com>:
>> 
>> On Thu, Nov 12, 2020 at 11:39 PM Carl Eugen Hoyos <ceffmpeg at gmail.com>
>> wrote:
>> 
>>>> I guess it is better to deinterlace first, then scale?
>>> 
>>> This is correct.
>> 
>> I tested to scale & crop first, and then deinterlace, and to my surprise
>> the output was identical.
> 
> While it may look similar (because only horizontal scaling was done),
> I don't think the output was identical.
> Both scaling and deinterlacing cannot be undone and do have an
> impact on quality (if you define quality as identity with a - possibly
> hypothetical - original).
> I can understand why you want to deinterlace, you should avoid
> the scaling (unless I miss something and you absolutely have to
> do it).
> 
> Carl Eugen
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