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  • Split a movie so that each GIF is under a certain file size

    9 novembre 2014, par Terence Eden

    Problem

    I want to convert a long movie into a series on animated GIFs.

    Each GIF needs to be <5MB.

    Is there any way to determine how large a GIF will be while it is being encoded ?

    Progress So Far

    I can split the movie into individual frames :

    ffmpeg -i movie.ogv -r 25 frameTemp.%05d.gif

    I can then use convert from ImageMagick to create GIFs. However, I can’t find a way to determine the likely file size before running the command.

    Alternatively, I can split the movie into chunks :

    ffmpeg -i movie.ogv -vcodec copy -ss 00:00:00 -t 00:20:00 output1.ogv

    But I’ve no way of knowing if, when I convert the file to a GIF it will be under 5MB.

    A 10 second scene with a lot of action may be over 5MB (bad !) and a static scene could be under 5MB (not a problem, but not very efficient).

    Ideas

    I think that what I want to do is convert the entire movie into a GIF, then find a way to split it by file size.

    Looking at ImageMagick, I can split a GIF into frames, but I don’t see a way to split it into animated GIFs of a certain size / length.

    So, is this possible ?

  • How to convert AVI movie to proper Apple itunes compatible movie ? [on hold]

    10 février 2019, par sd100

    I am converting an AVI movie to Itunes compatible movie the playback in itunes is garbled.

    Hi so I’ve used the following command with ffmpeg to convert avi to itunes movie :

    ffmpeg -i *.avi -c copy -map 0 output.mp4

    However when I add to itunes library the movie is garbled. What’s the right command to convert to mp4 compatible with itunes ? Thanks !

  • ffmpeg AVFrame get full decoded data to char*

    20 décembre 2018, par mmmaaak

    I get Frames in loop and decode it with ffmpeg getting AVFrame as e result of it.

    So I must get neccessary pixel data of frame into char* and give as a callback function’s parameter. So how I can generete such char* array ? In internet I saw some examples such as :

    for(y=0; ydata[0]+y*pFrame->linesize[0], 1, width*3, pFile);
    
}

    or something like this. Is it true ? And which size would be my char* ? As I see we write width*3 *height bytes ?

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