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• How to set Aspect ratios of all videos in FFMPEG ?

  23 décembre 2017, par alan samuel

  I am trying to concatenate 3 videos using a C# wrapper class. (NRECO.Videoconverter)

  All the videos have the same frame rate and size.

  However Aspect ratio of the second video is different.

  How can I set all the aspect ratio of the three videos to be the same. I would like to set the aspect ratio of the second video to be the same as the first and and third one.

  Here is what I have tried in C# using the wrapper class.

  ConcatSettings concatSettings = new ConcatSettings
  
   {
  
      CustomOutputArgs = "-filter_complex \"[1:v]setsar=1[v1];[0:v:0][0:a:0] [1:v:0] [1:a:0] [2:v:0] [2:a:0] concat=n=3:v=1:a=1[outv] [outa]\" \\-map \"[outv]\" -map \"[outa]\""
  
  
  
   };
  
  
  
  fFMpeg.ConcatMedia(inputfiles, finaloutput, Format.mp4, concatSettings);

  This gives me errors saying -

  [Parsed_concat_0 @ 04ded5e0] Input link in1:v0 parameters (size 852x480, SAR 160:213) do not match the corresponding output link in0:v0 parameters (852x480, SAR 12800:9443)
  
  [Parsed_concat_0 @ 04ded5e0] Failed to configure output pad on Parsed_concat_0
  
  Error configuring complex filters.

• Get screenshots out of multiple videos with subtitles

  16 mars 2023, par rkjles

  I'm trying to get a single frame from a video at every 50 seconds with ffmpeg including the subtitles from multiple videos

  


  The code I know of that will do this from a single video is

  


  ffmpeg -i “video.mkv” -vf “subtitles=subtitles.srt, fps=1/50” img%03d.bmp

  


  But I dont know to tell ffmpeg to do multiple videos with multiple subtitles (the second video being “video2.mkv” the second subtitle being “subtitles2.srt”, and the fps also being 1/50) so that it will do one right after the other

  


  I am new to all of this so if anyone could help me, that would be amazing, thank you

  


• Guidance on Implementing Custom Designs and Background Effects for Videos [closed]

  23 septembre 2023, par Joel Smith

  I am currently developing a web application that allows users to upload videos on the frontend. The primary goal of my project is to enable users to add custom designs to their videos and apply background effects. I'm using Python for the backend to handle video processing.

  


  I'm seeking advice on the appropriate technologies, libraries, or approaches to achieve the following :

  


  

  1. Custom Designs : I want to provide users with the ability to overlay custom graphics or text onto their videos. What Python libraries or tools can I use to achieve this ? Are there any best practices for adding graphics and text to videos dynamically ?

  


  2. Background Effects : I need to implement the feature to add background effects to uploaded videos. How can I achieve this, and what are the recommended methods or libraries for background replacement or manipulation ?

  


  3. Shadow Effects : Additionally, I want to enhance the visual appeal of the videos by adding shadow effects to elements like text or custom designs. What techniques or tools should I explore to achieve this effect ?
4.Combining Videos : To apply background effects, I need to merge the uploaded video with a background video or image seamlessly. What is the best approach to combine videos and maintain video quality during the process ?

  


  


  I have already implemented the frontend video upload to the backend and would appreciate any insights, code examples, or recommendations that can help me achieve these features effectively.