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• How to Fix Problem Drawer Text and Join with FFmpeg

  13 août 2019, par Marcos QP

  I have two short videos with good state (input1.mp4, input2.mp4).
  I use ffmpeg to edit videos.

  Part 1
  I combine two videos, it works correctly

  Part 2
  I draw text on input1.mp4, result output1.mp4, it works correctly.
  I join two videos (output1.mp4, input2.mp4), its join success. But result video is corrupt.

  ------------------------------------------------------------------

  I use these comands ffmpeg

  Combine Videos
  ffmpeg -y -f concat -safe 0 -i list.txt -c copy merged.mp4

  Draw Text on Video
  ffmpeg -y -i input1.mp4 -vf "drawtext=fontfile=/Windows/fonts/arialbd.ttf : text=’Some Text’ : fontcolor=white : fontsize=50 : box=1 : boxcolor=black@0.5 : boxborderw=5 : x=(w-text_w)/2 : y=(h-text_h/2)" -codec:a copy output1.mp4

  ------------------------------------------------------------------
  

  Please i need your help to drawer text and join.
  Sorry my bad english. I am still learning.
  Thanks.

• Convert form 30 to 60fps by increasing speed, not duplicating frames, using FFmpeg

  12 août 2018, par Matt Pellegrini

  I have a video that is incorrectly labelled at 30fps, it is actually 60fps and so looks like it’s being played at half speed. The audio is fine, that is, the soundtrack finishes half way through the video clip. I’d like to know how, if possible to fix this, that is double the video speed, making it 60fps and meaning that the audio and video are synced.

  The file is H.264 and the audio MPEG-4 AAC.

  File details as given by ffmpeg, as requested :

  ffmpeg version 0.8.9-6:0.8.9-0ubuntu0.13.10.1, Copyright (c) 2000-2013 the Libav developers
  
  built on Nov  9 2013 19:09:46 with gcc 4.8.1
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from './Tignes60fps.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2014-01-13 02:23:09
  
      Duration: 00:08:33.21, start: 0.000000, bitrate: 5690 kb/s
  
      Stream #0.0(eng): Video: h264 (High), yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 5609 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc
  
  Metadata:
  
      creation_time   : 2014-01-13 02:23:09
  
      Stream #0.1(eng): Audio: aac, 48000 Hz, stereo, s16, 156 kb/s
  
  Metadata:
  
        creation_time   : 2014-01-13 02:23:09
  
  At least one output file must be specified

• ffmpeg 'or' filter - what's the significance of red and blue ?

  9 juillet 2020, par BETLOG

  I'm tinkering with various ffmpeg filters to help me visualise the magnitude of difference certain presets use, and I notice a couple of filters display a lot of certain primary colours.
Specifically in this case : red and blue in an 'or' filter, and green in an 'and' filter.

  


  It seems useful to be able to tell WHICH input is being indicated, or to understand how the filters act in terms of sequence, and I'm hoping these colourations will help with this.
Or at least I'd like to better understand whatever they do represent.

  


  In the screenshot of the video segment above I see pure red and blue occasionally featuring strongly, and as the two extremes in the RgB palette it logically seems (and I'm hoping) they might indicate particular video inputs.
Similarly, the 'and' filter shows a lot of green shades, so I'm hoping someone can explain the meaning of the R,G, and B highlights in the 'or' and the 'and' filters.

  


  The relevant input and preset info in the images below is at the extreme left and right of each drawtext line.