[Libav-user] MPEG-2 NTSC video shows horizontal lines on the red color

Carl Lindqvist lulebo at gmail.com
Mon May 6 14:23:06 CEST 2013

I suspect your issue is with resampling the 4:2:0 mpeg video to 4:2:2
feeding the decklink card.

As 4:2:0 in interlaced is often poorly done or misunderstood, this is
often an issue. And since we are pretty bad at noticing errors in
color, it will only be obvious in very saturated colors.

How do you handle the conversion now? Make sure you really specify
that you are handling an interlaced source, since 4:2:0 is very
different in interlaced vs progressive.

2013/4/28 nuo yang <yangnuo0408 at yahoo.com.cn>:
> Hi everyone,
> Recently I use ffmpeg sdk to develop my own player, my video source is
> MPEG-2 NTSC video, and I use ffmpeg sdk to decode the video, then use
> BlackMagic DeckLink sdk to receive the video frame and display the video to
> my CRT monitor through a DeckLink PCI card. Everything is okay but a little
> defect, when the video contains some red color objects (like red clothes),
> and if the red color objects moving fast, there are some horizontal lines on
> red color. My video is interlaced, and I tried some methods, including
> change the video field order, but I didn't make it. BTW, if I use ffdshow to
> decode the video, it does not have the issue.
> Is there someone has the same issue like me, or can someone give me some
> advice? Many thanks in advance!
> - Nuo
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> Libav-user at ffmpeg.org
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