Hi, Welcome, On Tue, Jul 20, 2021 at 6:35 PM Paul Buxton <paulbuxton.m...@googlemail.com> wrote:
> Hi everyone. > I am planning on doingsome work on ffmpeg. The first thing I notice is that > the Ubuntu build instructions on the wiki aren't currently working with > Ubuntu 20. It seems that you need to install gnutls-dev as well as > unistring-dev. Is there a review process for content on the wiki, or should > I just add those dependencies? > Just add your changes. > > My plan is to implement a filter (or several) for correcting > underwater video. The algorithm I will be using works in a couple of steps. > 1. Analyse frame and calculate a corrective transform matrix > 2. Apply transform matrix. > > Would you typically split these up into separate filters (so that they are > reusable), or should I keep them as a single filter? > Just use single filter, I currently do not see need for separation. > The filter operates in the RGB domain. Should I make the filter handle YUV > as well by implementing a manual yuv to rgb conversion, or will the filter > chain handle this automatically? > Filter chain does it automatically, so if filter's algorithm operate in RGB just use RGB pixel formats. > > Is the input to a filter linear or gamma corrected? > It can be anything, but just typical values are used (they are certainly not linear). If for some reason filter operates in linear domain, use float RGB pixel formats. > > > Thanks, > Paul > Regards > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
