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• How to Resize Video 720:1280 Bigger Height, Width and Crop To 1280:720 using ffmpeg ?

  31 juillet 2021, par ChhengRavy

  I have video Original size 720:1280 and want to convert it to size 1280:720 but before converting I want to increase it bigger first.

  


  

  


  Using Code Below, I can resize the video to 1280:720 but it is not the result that I want.

  


  ffmpeg -i input.mp4 -filter_complex scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:-1:-1:color=black output.mp4


  


  

  


  This is what I want to get. Please Help Me To solve the problem. Your answer is so important to me.
Thank you so much. I am waiting your reply.

  


  

  


• Dynamically change video crop width, height, x and y using ffmpeg

  12 mai 2021, par Mario

  I am doing object detection on a video and so far I've gotten the coordinates of the objects in the video.

  


  now I want to crop the video frame by frame given the location/coordinates of the object

  


  My code so far :

  


  def crop_video(input_video_path, output_video_path, coordinate_list):
    
    crop_ratio = 'crop=%s:%s:%s:%s' % (coordinate_list[0][0], coordinate_list[0][1], coordinate_list[0][2],coordinate_list[0][3])
    subprocess.run(['ffmpeg', '-i', input_video_path, '-filter:v', crop_ratio, output_video_path])


  


  the crop_video function crops the entire video using only the first index in the coordinate_list list. How can I improve the code to change dynamically.
coordinate list looks similar to this :

  


   coordinate_list = [[147.5, 253.5, 927, 107],
     [147.5, 253.5, 927, 107],
     [147.0, 257.5, 928, 102],
     [148.5, 258.5, 925, 104],
     [148.5, 258.5, 925, 104],
     [155.0, 258.5, 918, 103],
     [155.0, 258.5, 918, 103],]


  


  How can I dynamically change the crop width, height, x and y using the coordinate_list. I am new to using ffmpeg

  


• FFmpeg doesn't recognize correct input height in hstack command

  23 mars 2021, par lach_codes

  Having an issue with an hstack FFmpeg command that has stumped me.

  


  input1 and input2 are both vertical 360x640 videos. I am cropping input1 to a square, merging it vertically with input2, then cropping a vertical strip off each side of the resulting video and horizontally merging these three videos (left strip, middle vertically-stacked video, right strip).

  


  ffmpeg -i input1.mp4 -i input2.mp4 -filter_complex [0:v]crop=360:360:0:140,fps=30[v0],[1:v]fps=30[v1],[v0][v1]vstack=inputs=2[m],[m]crop=101:ih:0:0[l],[m]crop=101:ih:259:0[r],[l][m][r]hstack=inputs=3[v];[0:a][1:a]amix[a] -map [v] -map [a] -preset ultrafast ./stackedOutput.mp4


  


  When I run this, I get an error :

  


  [Parsed_hstack_6 @ 0x7ff5394482c0] Input 1 height 640 does not match input 0 height 1000. [Parsed_hstack_6 @ 0x7ff5394482c0] Failed to configure output pad on Parsed_hstack_6


  


  (Full FFmpeg output here.)

  


  But the height of [m] (Input 1 in hstack) is not 640, it's 1000. I have verified this when the commands are run independently.

  


  Why is FFmpeg not recognizing the correct height of [m] ? Any help or pointers greatly appreciated ! Thanks in advance !