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• Use FFMPEG to put images separately inside a "box" and keeping their original positions of the X and Y boundaries and maybe modify their offsets

  14 septembre 2020, par karl-police

  I have a collection of images, for this example, I created 3 images that have different sizes, but the image itsself is the same, except it is moved more down or left or right.

  


  1 : 2 : 3 :

  


  These are the images. The total sizes of all images together is 35x39, so that means that they need to go inside an 35x39 image so it can later be used to craft them into a GIF as example. Since "crop" does not really work as it crops it smaller and can't make them bigger and I can't imagine it being the best solution for that anyway, perhaps.

  


  So this is the invisible 35x39 sized box.

  


  image :

  


  So what I'm trying to do is to figure out how I can put each of these images separately in the 35x39 sized box, but maintaining the original X position or the Y position or both, from the boundaries of the images. I'm trying to figure out how I can do this for other transparent images for similar things, mostly used to craft animations. Here into a GIF out of image collections, but the images need to be fixed first.

  


  I tried to look in the FFMPEG documentation, but there's many many filters and etc. that I had a few issues finding the right thing. I'm also not sure if it is also then possible to change the offset of the X and Y, because I think if there's something to make it keep the original position of X and Y, then I also think that there's probably something to change the offset of it aswell.

  


   

  


  End result of the images could basically be :

  


  1 : 2 : 3 :

  


  This end result example of the images, basically have their X aligned on the top and Y aligned on the left. I'm not sure if you can call it "original X position", because if I compare it to Photoshop's special paste and keep at original position, it puts the first image a bit more down as example, for some reason. So I just moved the X all the way to the top and the Y all the way to the left.

  


• FFMPEG - Convert DTS-Audio to AC3 - But Keep Original Video and Audio Files

  25 avril 2022, par NoErrorNoCry

  i am having trouble to understand the documentation on FFMPEG-Website

  


  Can you please help me out ?

  


  


  So far i got an working command for converting the DTS to AC3 but overwrite the original DTS

  


  


  C:\ffmpeg\bin\ffmpeg.exe -i File.mkv -map 0 -vcodec copy -scodec copy -acodec ac3 -b:a 640k File.mkv


  


• ffmpeg concat video size smaller than original videos

  23 août 2019, par Arigato Manga

  I’m trying to merge multiple videos using ffmpeg but the output of concat is half the size of original videos. Below is the ffmpeg command,

  ffmpeg -f concat -safe 0 -i input.txt -c copy video.mp4

  All the videos in input file have been split from a big file and converted using the below command,

  ffmpeg -i file1.mp4 -vcodec libx264 -filter_complex "[0:v]scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2[va]" -map "[va]" -strict experimental _file1.mp4

  They do not have any audio stream to them, so when I try to concat these videos the output file duration is smaller than the original videos combined.

  Below is the metadata for the input files,

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.26.100
  
      comment         : vid:v09044eb0000bhte9i09pog20dbdosn0
  
      genre           : aweme_6659292261320329989
  
    Duration: 00:00:15.12, start: 0.000000, bitrate: 797 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 794 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  
  
  
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file2.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.26.100
  
      comment         : vid:v09044a50000bjqkic7smmqi0mu76m20
  
      genre           : aweme_6697675734137228038
  
    Duration: 00:00:14.60, start: 0.000000, bitrate: 718 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 715 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  
  
  
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file3.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.26.100
  
      comment         : vid:v09044e50000bj0ajcqvfskris7ip2e0
  
    Duration: 00:00:15.50, start: 0.000000, bitrate: 548 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 544 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler