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• Was able to mix two audio files and 1 video, but the audio is not in sync with the video

  15 janvier 2019, par Sumeet

  I am trying to mix 2 audio files, say audio1.mp3 and audio2.wav with a video file, say video.mp4. I was able to mix the files into one file, say final.mp4, but the audio and video in the final file is not in sync.
  I used amix to mix the files using command prompt.
  I am not able to figure out how to use apad in my command line to see if that works. Should I really be using apad or am I on the wrong track ?

  ffmpeg -i video.mp4 -i audio1.mp3 -i audio2.wav -filter_complex "[1][2]amix=inputs=2[a]" -map 0:v -map "[a]" -c:v copy outputfilename.mp4

• Android record square video and concat

  25 février 2015, par faruk.kuscan

  Is there a way to record square (640x640) videos and concat them in Android ? I looked up in the Internet and found some solutions. The solution seems to be "ffmpeg". However, to use ffmpeg I need to dive into NDK and build ffmpeg from its sources. Is there a solution by only using the Android SDK ?

  My basic needs are :

  • Record multiple videos (square format)
  • Resize captured videos (i.e. 480x480 to 640x640)
  • Concat captured videos
  • Rotate final video (clockwise 90)
  • Final output will be in mp4 or mpg format

• Android FFmpeg cant set quality of image

  24 octobre 2017, par TheOtherguyz4kj

  I am working with FFmpeg on Android, I am trying to extract frames from a video every second. I made this command that works well :

  final String cmd[] = {
  
  
  
              "-i",
  
              videoPath,
  
              "-vf",
  
              "fps=1",
  
              mediaStorageDir.getAbsolutePath() +
  
              "out%d.png"
  
      };

  Now I want to reduce the quality of the extracted frames so I tried this but get the error :

  final String cmd[] = {
  
  
  
              "-i",
  
              videoPath,
  
              "-vf",
  
              "fps=1",
  
              "-qscale:v 12",
  
              mediaStorageDir.getAbsolutePath() +
  
              "out%d.png"
  
      };

  At least one output file must be specified

  What is the problem ? I have searched online a lot and cant find a solution to the problem, also is there a better way to reduce the quality of my extracted frames ?

  thanks