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• How can I make a slideshow of images into a video with each image having a specific length of frames to be shown ?

  24 novembre 2013, par jett

  Right now I am using something like this to create a video from a selection of images :

  avconv -i input%05d.png -r 24 -vsync cfr -c:v libx264 output.mp4

  But I want each picture to have a separate amount of time spent on it, so if I have 5 images I might want :

  [10frames, 40frames, 5frames, 80frames, 10frames]

  To be specified. The only thing I could find that may be a solution is to create five separate videos- set the length then merge them together, is this my only choice here ?

• Creating a GIF with fluent-ffmpeg, overlay is not shown ?

  5 mars 2021, par blablubla12

  I'm trying to create a GIF from an mp4 video, with an overlay on it. So there are two inputs, video.mp4 and overlay.png, both of them are https urls.

  


  The gif is created, ffmpeg shows no errors but the overlay doesn't appear in the gif. The code :

  


  ffmpeg()
    .withOptions([
        '-i video.mp4'
        `-ss 1`,
        `-i overlay.png`,
        '-f gif',
        `-filter_complex [0:v]trim=duration=3,setpts=PTS-STARTPTS,scale=450:-1[trimmed];[trimmed]split[trimmed1][trimmed2];[trimmed2]reverse[rev];[trimmed1][rev]concat=n=2:v=1:a=0[v];[v][1:v]overlay=0:0:format=rgb[overlayed];[overlayed]split[a][b];[a]palettegen=stats_mode=diff[palette];[b][palette]paletteuse=bayer:bayer_scale=3.5`
    ])
    .on('start', cmdLine => {
        console.log(`Started FFMpeg`, cmdLine);
    })
    .on('end', () => {
        console.log(`Success!.`);
        resolve();
    })
    .on('error', (err: Error, stdout, stderr) => {
        console.log(` Error:`, err.message);
        console.error('stdout:', stdout);
        console.error('stderr:', stderr);
        reject();
    })
    .pipe(destinationStream, { end: true });


  


  Note : I have to use a stream, instead of saving to file.

  


• avcodec/put_bits : Relax requirements to rebase PutBitContext

  16 novembre 2019, par Andreas Rheinhardt

  avcodec/put_bits : Relax requirements to rebase PutBitContext
  The earlier requirement was for the new buffer to be bigger than the old
  
  one. This has been relaxed to only demand that the new buffer can hold
  
  all the data written so far. This is in preparation for further commits.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/put_bits.h