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  • Vertical video play does not sync with multiple stacked video

    5 novembre 2018, par Sabha

    I dont know if I have wrote the subject well and if that can be understood. Nevertheless, here is an explanation

    I have 7 videos of different dimensions where the width is same (1080). I wish to place them one below the other to get a full hd vertical video (1080x1920). I tried the -filter_complex vstack filter in ffmpeg and got all the videos aligned one below the other and I am getting a perfect 1080x1920 full hd vertical video but they dont sync with each other. Once the videos are in sync, I need to put an audio too which should also sync with the in-sync video that will be made.

    There is so much of complexity. Please advice how do I make them sync. Is there any software that can allow me to put 7 videos one below the other in a timeline ? (if not 7, atleast 3-4 videos). Please advice where and how to start.

    Is there any option in Adobe Premier or any other software ?

    Thanks

    EDIT : I am doing a very long procedure to combine all 7 videos vertically

    first i use

    ffmpeg -i video1.mp4 -i video2.mp4 -preset veryslow -filter_complex vstack video12.mp4

    and then

    ffmpeg -i video12.mp4 -i video3.mp4 -preset veryslow -filter_complex vstack video123.mp4

    so on and so forth

    Is there a better way to do it all in one command ?

  • Piping stdout from child process directly to google cloud storage. Node.js

    2 octobre 2018, par glenn

    anyone here with expertise on piping to google cloud storage ?

    i am using FFmpeg on a server, and want to pipe to my storage bucket.

    I can get it working when I save FFmpeg output to a file, then createReadableStream from the file, and then pipe that to createWriteStream()

    however, I dont want to generate a static file, and then go through that process every time

    Why can I not just simply pipe FFmpeg.stdout.pipe(file.createWriteStream()) ?

    FYI : I am running FFmpeg as a child process

          spawnFFMPEG = () => {
    
this.ffmpeg = child_process.spawn('ffmpeg',
    
  [
    
    '-f', 'lavfi', '-i', 'anullsrc',
    
    '-thread_queue_size', '512',
    
    '-i', '-',
    
    '-shortest', '-vcodec', 'copy',
    
    '-f', 'avi',
    
    'pipe:1'
    
  ]
    
)
    

    
 this.ffmpeg.stdout.pipe(myWritableStream)

  • avcodec/rasc : Fix off by 1 error in vertical coordinate

    2 octobre 2018, par Michael Niedermayer
    avcodec/rasc : Fix off by 1 error in vertical coordinate

    Fixes : out of array read
    
Fixes : 10311/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RASC_fuzzer-4856330905452544
    

    Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
    
Reviewed-by : Paul B Mahol <onemda@gmail.com>
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavcodec/rasc.c

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