[FFmpeg-devel] [PATCH] Implement NewTek NDI support

Maksym Veremeyenko verem at m1stereo.tv
Tue Aug 8 12:29:08 EEST 2017

On 03.08.2017 10:41, Steinar H. Gunderson wrote:
> On Thu, Aug 03, 2017 at 08:21:09AM +0300, Maksym Veremeyenko wrote:
>>> You should reject bottom field first formats, as NDI explicitly
>>> disallows them.
>> even if it disallowed, why to drop? may be warning message would be enough?
> FWIW, the documentation may say that formats are always TFF, but on the wire,
> it seems the bottom field actually goes first.
> (I guess this is a bug that isn't noticed because there's actually no way
> from the API to get at the individual fields)
i dropped bottom field order support.

>> +NDI is very picky about the formats it supports. Pixel format is always
>> +uyvy422.
> Or bgra (internally, uyvya4224, I suppose).
i extended supported pixel format, except uyvya4224 that is not 
supported by ffmpeg

>> +    recv_create_desc.allow_video_fields = ctx->allow_video_fields;
> I'm not convinced you ever want to set this to false, as what's happening if
> you do is simply that the SDK applies a vertical blur to incoming interlaced
> frames. FFmpeg has much better deinterlacers if that's what you want.
i dont know which method used by SDK to deinterlace, but if it provided, 
then it could be used for some reason.

Maksym Veremeyenko

More information about the ffmpeg-devel mailing list