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Sur d’autres sites (11496)

  • Convert video to exactly the same stream type of other video in ffmpeg

    14 avril 2014, par user1750371

    Maybe this is a silly question, didn't manage to find a clear answer anywhere.

    I need to use ffmpeg to convert a given video to exactly the same format another video has, including bitrate, video and audio codecs... everything. The goal is to concat both videos into a single file, independently of the original formats.

    Is there an easy way to do this or do I have to build a complex command line input specifying all parameters ?

    The concat demuxer is not enough... maybe something with filter_complex ?

    Thanks and sorry for the bother.

  • Overlay two sequences of png's and turn them into a movie

    12 mai 2014, par Lau Llobet

    I’ve found how to turn a png sequence into a movie and I’ve found how to overlay two movies using transparency but I don’t know how to do both things at once (using png’s transparency).

    The bottom layer of png’s is smaller than the top one and needs to be stretched to a certain resolution and also have a padding to be centered.

    The output doesn’t have to have alpha (black for alpha is ok). I’m a bit confused by the abundance of filter options.

    For the moment I’ve found :

    ./ffmpeg -i ./seq1/%d.bmp -vf "movie=./%d.png [a]; [in][a] overlay=0:366" combined.m2v

    It works, now I’ve got to find the padding and resize things

  • generate video containing scrolling image

    20 juin 2014, par Sorin Buturugeanu

    I want to generate a video [let’s say 800x600] from a 800x10000 still image.

    The image has to scroll, from top to bottom as if someone was actually scrolling a page.

    If it could scroll faster over some portions and slower over others, that would be great, if not I think I could just make a few separate videos and then just stitch them up.

    I cannot find any documentation on this subject ; could anyone give me a hint ? Thanks for your time !

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