On Sat, Dec 29, 2012 at 9:33 AM, Janne Liljeblad <[email protected]> wrote: > Hi, > > I just got mail from user whose asked "give the user the ability to > cut there scenes and clips without quality loss." and I realized that > I haven't paid much attention to the subject, as I've viewed MLT as > "good enough from what I can see". > > But I do lack the technical details to answer the question more precisely. > > I think the MLT main pipeline is: > > libavformat -> > yuv420 frames -> > MLT internally works with yuvframes -> > yuv420 -> RGB -> yuv420 for some stuff (Frei0r plugins for example) > yuv420 -> encoder (libavformat) > yuv -> RGB to monitor > > So we're always going to lose some color information compared to > camera RGB, but most of that quality loss happens before material > comes anywhere near MLT. > > This page (http://discoverybiz.net/enu0/faq/faq_YUVbyBreeze_test_00.html) > says that several RGB->YUV->RGB conversions can degrade quality, so a > high number of Frei0r plugins will lose information, but usually > plugins themselves lose more. > > Also the Profile used to create MLT objects has no impact from this > point of view; it controls the frame rate pixels size, aspect ratio... > The best quality comes when you use Profile that exactly matches > geometry of input files and render them with the same profile, this > avoids any unnecessary scaling. > > If you could give some additional information on the subject, that > would be much appreciated. > > > Janne
I think the person who emailed you is asking for the ability to cut compressed material without re-compressing it - at least in the areas not affected by filters/transitions. This is not in any of my short or medium term plans for MLT, but someone else is free to work on it. -- +-DRD-+ ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. SALE $99.99 this month only -- learn more at: http://p.sf.net/sfu/learnmore_122912 _______________________________________________ Mlt-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mlt-devel
