[FFmpeg-user] Video filtering for chroma dot crawl and rainbow effect

Paul B Mahol onemda at gmail.com
Mon Jan 25 10:19:39 CET 2016

On 1/25/16, Christian Johannesen <chrisjohannesen at gmail.com> wrote:
> On Sun, Jan 24, 2016 at 8:23 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
>> Christian Johannesen <chrisjohannesen <at> gmail.com> writes:
>> > Looked through all the documentation for FFMPEG and I can't
>> > seem to find any video filters that deal with chroma dot
>> > crawl & rainbow artifacts in files captured from analog
>> > tape formats.
>> One of the reasons we always ask for command line including
>> complete, uncut console output is that it often helps
>> understanding the original issue.
>> I am not convinced I understand your issue but maybe you
>> are searching for the interl option of the scale filter?
>> $ ffmpeg -i test_720x486i_dotcrawl.mov -vf scale=interl=1,fieldmatch
>> I opened ticket #5187 because of the green lines fieldmatch
>> produces.
>> Carl Eugen
>> My goal was to remove some of the video artifacts before compressing to
> x264. Sort of like this
> http://home.earthlink.net/~tacosalad/video/dotcrawl.html
> I think I named my files more generally when I uploaded them.
> test_720x486i_dotcrawl.mov shows more of the rainbow effect in some of the
> detail areas than the dot crawl. I tested processing that clip to 23.98 in
> this command line example.

There is tcomb avisynth filter for removing dot crawl and rainbows from *static*
parts of videos.

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