On Sun, Nov 08, 2015 at 02:44:02PM -0800, Zach Swena wrote: > Hi, > > I would like to propose a change to the documentation for the overlay > filter. The overlay filter does not detect pixel aspect ratio. This > causes improper display resolution when overlaying smaller images on a > larger image. A common example of this would be overlaying an SD source on > an HD one. The documentation does not mention the fact that overlay > ignores pixel aspect ratio because it is a pixel by pixel operation. It > would be nice to remind people that they need to overlay pictures with the > same pixel aspect ratio or perform a scaling operation. One common example > of this would be overlaying SD video on a HD background. I tried to make a > patch, but I couldn't find the right file. > > It would be nice to add something like this at the end of the 9.83 section > just prior to section 9.83.1 in what becomes ffmpeg-filters.html. Please > let me know if I need to submit this in some other form.
a git patch for doc/filters.texi would be ideal > > Please note that overlay is a pixel per pixel operation so a scaling > operation will be required to properly combine sources with different > source aspect ratios such as SD and HD video. > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB What does censorship reveal? It reveals fear. -- Julian Assange
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