On Fri, Mar 16, 2012 at 09:42, <[email protected]> wrote: > > Ok, thanks for the answer. So If I have well understood, in this case I sould > insert 1:1 that means no frame distortion. With this settings if I start > from a 4:3 frame (720x576) I obtain the same frame form in output. Right ?
Right. - Alex There is a nice explanation of ffmpeg -aspect parameter (which is mapped to .sample_aspect_ratio) http://howto-pages.org/ffmpeg/ quote -aspect 4:3 MPEG2 video allows for anamorphic display. This means that the aspect ratio (width divided by the height) of the physical picture displayed on-screen can be different from the ratio obtained by dividing the pixel-width of the image by its pixel-height. This has to be built in to the video specification used with DVDs because, regardless of whether we're viewing a movie in old 4:3 aspect ratio or a movie in 16:9 widescreen format, the pixel size of the digital image is still 720x480 for an NTSC DVD (720x576 for PAL). The image is in fact stretched such that its aspect ratio is as specified by the "-aspect" option. This usually involves stretching it only along its width or along its height, hence the name "anamorphic". unqoute _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
