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• How can we play 2 videos side by side as per the resolution we provide to the output video and adjust the two input videos position

  1 December 2023, by Bhavya Nayak

  -> For playing two video side by side as per the output video resolution I provide :-

  


  

  1. I want output video of resolution 1280x720 so for this.

  


  


  a. First I have trimmed the two video using below command :-

  


  ffmpeg -i input_viedo.mp4 -ss 00:00:10 -t 00:00:20 -vf      "scale=1920:1080,pad=1920:1080:0:0:yellow" -c:v libx264 -c:a aac -strict -2 output_video_trimmed.mp4



  


  b. Now to I want to play both the trimmed video into one output video file as per the position I provide , so for this I have tried below command which is not giving the correct output :

  


  ffmpeg -i output_video_trimmed_1.mp4 -i output_trimmed_2.mp4 -filter_complex "[0:v]scale=634:360[pad1];[1:v]scale=640:360[pad2];[pad1]pad=1280:360:0:100[tl];[pad2]pad=1280:360:634.752:130.392[br];[tl][br]vstack,scale=1280:720[output]" -map "[output]" -c:v libx264 -preset ultrafast -crf 18 -c:a aac -b:a 1280x720 output_final_video.mp4


  


  

  • In above command I have provide the specific width,height,top,left of the input video I want ,

  


  


  But it is not giving me correct output.

  


  —> Output I am getting by running this command is attached below :-

  


  Output video Image I am getting by running above command

  


  Actual output I want

  


  —> The issue in above command is while adding top it is not working properly , like top is not affecting the video so I want the solution for that.

  


• From Python, piping images to FFMPEG process with audio input, "-shortest" flag causes output file to contain only 1 frame of video and entire audio

  7 November 2023, by b_yang

  From Python, I run FFMPEG and write images to its stdin via pipe, the FFMPEG process has an audio file as input too. Everything works fine like this:

  


  cmd = ['ffmpeg', '-hide_banner', '-y', '-loglevel', 'error', '-f', 'rawvideo', 
'-pix_fmt', 'bgr24', '-video_size', '720x1280', '-r', '30.0', '-an', '-i', '-',
'-i', 'audio.aac', '-acodec', 'copy', 
'-crf', '14', '-pix_fmt', 'yuv420p', 'output.mp4']
proc = subprocess.Popen(cmd, **popen_params)


  


  Because the audio duration might be longer than the video duration, I added a '-shortest' flag (before '-crf'):

  


  cmd = ['ffmpeg', '-hide_banner', '-y', '-loglevel', 'error', '-f', 'rawvideo', 
'-pix_fmt', 'bgr24', '-video_size', '720x1280', '-r', '30.0', '-an', '-i', '-',
'-i', 'audio.aac', '-acodec', 'copy', 
'-shortest', '-crf', '14', '-pix_fmt', 'yuv420p', 'output.mp4']
proc = subprocess.Popen(cmd, **popen_params)


  


  However, with the '-shortest' flag, the resulting output.mp4 contains the entire audio, but only 1 frame of video data. What is going on here ?

  


• add watermark to video and image with input and output array bytes

  7 October 2023, by Josivan

  I'm trying to add watermark to images and videos using ffmpeg. My files are stored on AWS S3, so they are byte arrays ([]byte).

  


  I need my input and output to be in a byte array and not saved to disk.

  


  I tried something like the code and it didn't work:

  


      buffFile := bytes.NewBuffer(file)
    out := &bytes.Buffer{}
    overlay := ffmpeg.Input("pipe:", ffmpeg.KwArgs{}).Filter("scale", ffmpeg.Args{"64:-1"}).WithInput(buffWatermark)
    err = ffmpeg.Filter(
        []*ffmpeg.Stream{
            ffmpeg.Input("pipe:", ffmpeg.KwArgs{}).WithInput(buffFile),
            overlay,
        }, "overlay", ffmpeg.Args{"10:10"}, ffmpeg.KwArgs{"enable": "gte(t,1)"}).
        Output("pipe:", ffmpeg.KwArgs{}).WithOutput(out).OverWriteOutput().ErrorToStdOut().Run()