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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.

  


• Revision 9f37d149c1 : Better validation of invalid files This patch checks that a decoder never tries

  27 juin 2014, par Jim Bankoski

  Changed Paths :
   Modify /test/invalid_file_test.cc

  
   Modify /test/test-data.sha1

  
   Modify /test/test.mk

  
   Modify /vp9/common/vp9_frame_buffers.c

  
   Modify /vp9/common/vp9_scale.c

  
   Modify /vp9/common/vp9_scale.h

  
   Modify /vp9/decoder/vp9_decodeframe.c

  
  
  Better validation of invalid files

  This patch checks that a decoder never tries to reference frame that’s
  outside the range of 2x to 1/16th the size of this frame. Any attempt
  to do so causes a failure.

  Change-Id : I5c98fa7bb95ac4f29146f29dd92b62fe96164e4c