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• How do I cut black frames from video with ffmpeg ?

  13 mai 2020, par h0dges

  I've got a timelapse video with overnight frames that are not illuminated and would like to know how to either :

  



  

  • Cut the black frames (pblack=99) out of the video AND correspondingly reduce the
length of the output video (i.e. not duplicate or interpolate frames)

  


  • Analyse the input images before generating the timelapse video in order to exclude the overnight images from the video.

  


  



  Just to be awkward I'd like to use the jrottenberg/ffmpeg docker image.

  



  This is the command I'm currently using to generate the timelapse video :

  



  docker run -v timelapse-images:/images -v timelapse-videos:/videos jrottenberg/ffmpeg -y -f image2 -framerate 30 -pattern_type glob -i '/images/*.jpg' /videos/timelapse.mp4


  


• Crop black padding and resize back to original 1920x1080

  1er juin 2020, par Satish Kumar

  I have video of resolution 1920x1080 (16:9 aspect ratio). When played its padded with black box on all sides. How to remove the black boxes to get the 1920x1080 video ?

  



  Screenshot of video

  



  Below the audio and video details :

  



  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Maths Logic.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.19.102
  Duration: 00:43:11.24, start: 0.000000, bitrate: 1475 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 1405 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 64 kb/s (default)
    Metadata:
      handler_name    : SoundHandler


  


• Cutting HEVC video results in parts stating with no video (black image) but correct audio for a few seconds

  8 juin 2020, par Oliver

  i have large HEVC video files and want to cut out parts of them. I use ffmpeg for that with the following command :

  



  ffmpeg -i input.mp4 -ss 01:18:47.040 -c:v copy -c:a copy -to 01:18:42.640 output.mp4


  



  i know that there can be problems when copy is used and no re-encoding, that is why i checked before that the frames specified in the -ss and -to parameters where keyframes (i-frames).

  



  So iam expecting to get a clean cut at the beginning and at the end. But what i get is 10 seconds of black image with normal audio in the beginning until the video starts. To make this clear : 10 seconds of video are missing in the beginning but the audio is fine.

  



  Btw : when moving the -ss part before the -i there seem to be no problems with the video (at least in the beginning). I know about the differences of putting -ss before and after the -i, but i also know, that using -ss after the -i should be slower (and was more accurate in the past) but should not make any differences in the final result. That is why I am so irritated.