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• using ffmpeg to resize video with black bars

  23 juillet 2018, par Jens S

  i have a video with resolution 720:576 and i want it to have the ratio 16:9, e.g. 1024:576 with black bars on the sides. don’t know if it matters, but i am working with ffmpeg for windows. After research i tried the solution i found on 2 related questions :

  -i .\video.mp4 -vf scale=1024:576:force_original_aspect_ratio=decrease,pad=1024:576:(ow-iw)/2:(oh-ih)/2,setsar=1 out.mp4

  but i get an output that "ow-iw" was not recognized. Here is the complete output. unfortunatly it is in german(as am i) if u tell me how to change the output language i will provide it in english :

  ow-iw : Die Benennung "ow-iw" wurde nicht als Name eines Cmdlet, einer Funktion, einer Skriptdatei oder eines ausführbaren Programms erkannt. Überprüfen Sie die Schreibweise des
  
  Namens, oder ob der Pfad korrekt ist (sofern enthalten), und wiederholen Sie den Vorgang.
  
  In Zeile:1 Zeichen:119
  
  + ... :576:force_original_aspect_ratio=decrease,pad=1024:576:(ow-iw)/2:(oh- ...
  
  +                                                             ~~~~~
  
      + CategoryInfo          : ObjectNotFound: (ow-iw:String) [], CommandNotFoundException
  
      + FullyQualifiedErrorId : CommandNotFoundException

• Extract part of a video using ffmpeg_extract_subclip - black frames

  20 août 2020, par albert1905

  I'm trying to use : "ffmpeg_extract_subclip" for extracting part of a video.

  


  And I'm facing a few problems :

  


  1.when I'm cutting a small video (1-3seconds) I'm getting black frames, only audio is working.
2.when I'm cutting longer video, the output video is stuck 2-3 seconds before the end.

  


  This is my simple code :

  


  from moviepy.video.io.ffmpeg_tools import ffmpeg_extract_subclip

input_video_path = 'myPath/vid1.mp4'
output_video_path = 'myPath/output/vid1.mp4'
t1 = 6.5
t2 = 16    # random numbers, my last attempt..
    
ffmpeg_extract_subclip(input_video_path, t1, t2, targetname=output_video_path)


  


  I tried to look inside the code :
ffmpeg_extract_subclip Function

  


  But still couldn't understand what's wrong.. :(

  


  I'm still trying, and if anyone knows the problem or have a different approach, that will be amazing.

  


  Thanks a lot for your help !

  


• Generate Black frames between concatenated videos ffmpeg

  9 février 2019, par Alex K

  I’m trying to concatenate 2 videos together using ffmpeg concat, but I want to have there be 2 seconds of black between the 2 videos.

  The problem is that whenever I’ve tried to generate a black video and concatenated it in, the properties never match my input video exactly, and so the concatenation is all broken - the audio is broken or the frames change at the wrong speed or generally concatenation fails.

  Here’s the output of ffmpeg -i my_input_video1.mp4 (and is identical for my_input_video2.mp4) :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input_vid1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.3.100
  
    Duration: 00:00:03.07, start: 0.000000, bitrate: 191 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 480x270, 116 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 63 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler

  How can I generate a 2 second black video with these properties so that it can be concatenated with my input videos ?