[FFmpeg-devel] [PATCH] cuvid: add drop_second_field as input option and enable it by default

[Miroslav Slugeň]

Dne 12.2.2017 v 20:56 Timo Rothenpieler napsal(a):
> On 2/12/2017 8:35 PM, Miroslav Slugeň wrote:
>> Thx for comment,
>>
>> cuvid can't output 50fps deinterlaced output, both frames are same, and
>> default behavior for yadif is to downcovert to half frame rate, so i
>> think is very clever to do the same here.
>>
>> Also if we return in decoder that input is framerate/2 when
>> deinterlacing we should stay with that!
>>
>> if (ctx->deint_mode != cudaVideoDeinterlaceMode_Weave)
>>      avctx->framerate = av_mul_q(avctx->framerate, (AVRational){2, 1});
> That equation multiplies the framerate by two, as deinterlacing doubles
> it from for example 25 to 50, producing two output frames for each input
> frame with two fields.
>
> Judging from the cuvid examples, extracting two frames per interlaced
> frame is the intended way of using the decoder, and at least in Adaptive
> mode the frames are definitely not the same.
> Never gave bob to much of a look, maybe it doesn't support it there.
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Sorry, my fault, you are true, than please ignore this patch.

I will prepare updated one.

M.