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  • FFMPEG Take 1 second clips each video file from a directory of files, and until total playtime reached

    3 février 2021, par Matthew

    I'm working on a music art video project for a song.

    


    I have a directory that contains approximately 400 individual videos

    


      

    • varying lengths (as short as 3 seconds and as long as 31 minutes)

      • 


    • varying file types (mp4 and webm)

      • 


    • varying resolutions/framerates/bitrates

      • 


    


    The output video should consist of :

    


      

    • 1 second chunks of each video

      • 


    • in round-robin fashion

      • 


    • until all videos are played fully or the output total video length reaches a certain limit (example, 20 minutes).

      • 


    • Output video should be 1280×720 at 24fps, with no preference to bitrate.

      • 


    • Videos that are larger should be scaled down and letterboxed (vertically or horizontally).

      • 


    • Audio is not important at all. The video can be silent. I can overlay audio separately.

      • 


    


    I do not want to loop short videos. In the example below, you can see that, for top-left-view-take-1.mp4, each 'clip' that's taken is incrementally further into the video. In other words, it shouldn't take the same 1 second clip from the beginning. The goal is to get further in to each individual video as the output video progresses.

    


    For example, say my directory contains files such as the following (and, for the example here, we'll say that this is all files in the directory) :

    


    overhead-view-take-1.mp4 (3 seconds, for the sake of the question)
top-right-view-take-1.mp4 (3 seconds, for the sake of the question)
top-right-view-take-2.mp4 (5 seconds, for the sake of the question)
outside-kaleidoscope-1.mp4
yellow-kaleidoscope-1.mp4
red-kaleidoscope-1.mp4
brake-lights-slow-1.mp4
soft-city-lights.webm


    


    Assume anything that isn't marked with a video duration is at least 5 seconds long.

    


    Based on the above files & times, here would be the order and time code of each clip during the first 30 seconds of the output video :

    


    Based on each video's total duration, the output video should include 1 second clips from all videos in the directory.

    


    





    


    


    


    


    


    



    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    Output time Clip time Clip file
    00:00-00:01 00:00-00:01 overhead-view-take-1.mp4
    00:01-00:02 00:00-00:01 top-right-view-take-1.mp4
    00:02-00:03 00:00-00:01 top-right-view-take-2.mp4
    00:03-00:04 00:00-00:01 outside-kaleidoscope-1.mp4
    00:04-00:05 00:00-00:01 yellow-kaleidoscope-1.mp4
    00:05-00:06 00:00-00:01 red-kaleidoscope-1.mp4
    00:06-00:07 00:00-00:01 brake-lights-slow-1.mp4
    00:07-00:08 00:00-00:01 soft-city-lights.webm
    00:08-00:09 00:01-00:02 overhead-view-take-1.mp4
    00:09-00:10 00:01-00:02 top-right-view-take-1.mp4
    00:10-00:11 00:01-00:02 top-right-view-take-2.mp4
    00:11-00:12 00:01-00:02 outside-kaleidoscope-1.mp4
    00:12-00:13 00:01-00:02 yellow-kaleidoscope-1.mp4
    00:13-00:14 00:01-00:02 red-kaleidoscope-1.mp4
    00:14-00:15 00:01-00:02 brake-lights-slow-1.mp4
    00:15-00:16 00:01-00:02 soft-city-lights.webm
    00:16-00:17 00:02-00:03 overhead-view-take-1.mp4
    00:17-00:18 00:02-00:03 top-right-view-take-1.mp4
    00:18-00:19 00:02-00:03 top-right-view-take-2.mp4
    00:19-00:20 00:02-00:03 outside-kaleidoscope-1.mp4
    00:20-00:21 00:02-00:03 yellow-kaleidoscope-1.mp4
    00:21-00:22 00:02-00:03 red-kaleidoscope-1.mp4
    00:22-00:23 00:02-00:03 brake-lights-slow-1.mp4
    00:23-00:24 00:02-00:03 soft-city-lights.webm

    


    


    Now, the output video should include 1 second clips only from videos that still have time remaining. The videos that don't have any time remaining, such as overhead-view-take-1.mp4 and top-right-view-take-1.mp4, are not present here.

    


    





    


    


    


    


    


    



    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    Output time Clip time Clip file
    00:24-00:25 00:03-00:04 top-right-view-take-2.mp4
    00:25-00:26 00:03-00:04 outside-kaleidoscope-1.mp4
    00:26-00:27 00:03-00:04 yellow-kaleidoscope-1.mp4
    00:27-00:28 00:03-00:04 red-kaleidoscope-1.mp4
    00:28-00:29 00:03-00:04 brake-lights-slow-1.mp4
    00:29-00:30 00:03-00:04 soft-city-lights.webm

    


    


    What I've tried

    


      

    • I've read through the docs and cobbled together some code that produces output, but it only seems to work with images ; I can't get the same thing to work with videos (specifically the incremental chunks).

      • 


    • I've tried manipulating commands meant to `create a snapshot every x seconds/frames' but I've hit dead ends there.

      • 


    • I've also started trying to create a text file to run the input from. That's the point where I thought it would make sense to ask here.

      • 


    


    My main issue is picking off incremental chunks of individual videos, and playing those in sequence.

    


    Thoughts ?

    


    Environment details
I have access to Win, Mac, and Linux machines. So, that environment isn't as important to me. Here's ffmpeg's output :

    


    ffmpeg version 4.3.1-0york0~16.04 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609
  configuration: --prefix=/usr --extra-version='0york0~16.04' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libzimg --enable-pocketsphinx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Hyper fast Audio and Video encoder


    


  • avcodec/vb : Cleanup generically after init failure

    13 septembre 2020, par Andreas Rheinhardt
    avcodec/vb : Cleanup generically after init failure

    In other words : Set the FF_CODEC_CAP_INIT_CLEANUP flag.
    

    Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
    • [DH] libavcodec/vb.c

  • how to re-encode a movie to an encoding codec of another one with ffmpeg

    28 mai 2020, par gota

    Let's say I have 2 movies (movie1.mp4 and movie2.mp4), How can I use ffmpeg to reencode movie1.mp4 exactly with the same video codec, same bitrate, same audio codec as found in movie2.mp4 ?

    &#xA;&#xA;

    In other words, such that the output of ffprobe movie1.mp4 matches that of movie2.mp4 ?

    &#xA;&#xA;

    Why do I want this ? because I'm having problems concatenating both movies.

    &#xA;

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