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• How to overlay audio over video in ffmpeg ? [duplicate]

  24 avril 2019, par Rohan Patil

  This question already has an answer here :

  • How to add a new audio (not mixing) into a video using ffmpeg ?
    
    6 answers
    
  • Xamarin Android merge audio files with FFMpeg
    
    1 answer
    
  • How to overlay two audio files using ffmpeg
    
    5 answers
    

  I wanna make a android app which can overlay a audio to a video by clicking a button and I am using ffmpeg. The format of my video and audio are mp4 and mp3. I want the output video format is mp4. I have searched for many solutions but none of them give me a satisfied result. All of them are just replaced the original audio of my video to the audio of the audio file. What I want is to overlay my aduio file to the video file and keep the sound of the video at the same time. Does anyone have any idea to do this ? Thank you !

  command = new String[]{"-i", input_movie.mp4,"-i", input_audio.mp3, "-c", "copy", "-map", "0:0", "-map", "1:0", output.mp4};

• ffmpeg on aws-lambda not converting GIF to MP4 all the way

  1er septembre 2019, par Jay

  This is my input gif

  

  Using Windows CMD my output is exactly what I want

   ffmpeg -i in.gif out.mp4

  Same code on AWS Lambda results in mp4 cut short

  Might help knowing im running python 3.2

  os.system("/tmp/ffmpeg -i /tmp/input.gif -c:v libx264 -preset veryslow -qp 0 /tmp/out.mp4")

  I already tried -stream_loop -1 and that did not work

  Already tried -movflags faststart -pix_fmt yuv420p

  Already tried uploading the latest static files for ffmpeg 4.2

  I also verified that the input.gif was not corrupted in the tmp directory

  I’ve also seen other ffmpeg question for linux and people report their mp4 being short...what can I do ?

  https://unix.stackexchange.com/questions/40638/how-to-do-i-convert-an-animated-gif-to-an-mp4-or-mv4-on-the-command-line

  See the comment for the top answer.

• Convert raw RGB32 file to JPEG or PNG using FFmpeg

  16 décembre 2019, par PhotometricStereo

  Context

  I used a C++ program to write raw bytes to a file (image.raw) in RGB32 format :

  R G B A R G B A R G B A ...

  and I want to be able to view it in some way. I have the dimensions of the image.

  My tools are limited to command line commands (e.g. ffmpeg). I have visited the ffmpeg website for instructions, but it deals more with converting videos to images.

  ---

  Questions

  Is it possible to turn this file into a viewable file type (e.g. .jpeg, .png) using ffmpeg. If so, how would I do it ?

  If it’s not possible, is there a way I can use another command ?

  It that’s still not viable, is there any way I can manipulate the RGB32 bytes inside a C++ program to make it more suitable without the use of external libraries ? I also don’t want to encode .jpeg myself like this.