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• How to downsample all the videos in a folder using ffmeg

  8 novembre 2020, par amarykya_ishtmella

  I have a folder with videos of different types (mainly .MTS or .mov, but strong possibility that in future there will be other types). I want to downsample it. This is the code that I won't, but it's not working.

  


  from pathlib import Path
import subprocess, os
import cv2

path= '/Volumes/Element/videos/'

for filename in os.listdir(path):
    if filename.endswith(".MTS") or filename.endswith(".mp4"): 
        os.system("ffmpeg -i{0} -vf scale=500:-2 output%p.MTS".format(filename))
        continue
    else:
       os.system("ffmpeg -i{0} -vf scale=500:-2 output%p.MTS".format(filename))
       continue


  


• uploading videos using ffmpeg with php not completed if > 1mb

  15 janvier 2016, par Yasser Hossam

  I’m using FFMPEG to upload videos to my server,

  I’ve tested on 1MB file and it is working correctly, but then I’ve tested on 6MB and 50MB file and it try to upload but still with "processing" status with no change.

  Here is the code which I use

  exec("/usr/local/bin/ffmpeg -i ../uploadedvideo/".$image_name." -ab 56 -ar 44100 -b 200 -r 15 -s 240x180 -fs 314572800 -f flv ../uploadedvideo/".$image_namew.".flv"); 

  What could be the problem ?

• Concatenate multiple videos with a black screen loop into one video

  23 février 2020, par Marcel

  I am using ffmpeg to join a bunch of videos together.
  I am using the classic join ffmpeg code :
  

  ffmpeg -f concat -i joinlist.txt -c copy joinedfile.mp4

  but the problem is that the videos are of different formats, encodings, but the same size : all 640x480. I want to join them all and put a black screen video with no sound every other video :

  video1 + black_screen_video + video2 + black_screen_video + video3 ...

  I generated a black screen video of 2 seconds duration using :

  ffmpeg -f lavfi -i color=c=black:s=640x480:d=2 black_screen_video.mp4

  so all of the videos are of the same size : 640x480, and 25 fps but different codecs. The videos have sound, except for the black screen video.
  I can’t do anything manual, because the number of videos are around several hundred. So it has got to be an automatic way to do all this.

  When I joined them together using the above code, the resulting video does not play correctly at all.

  I know that I have to re-encode them, but how to do this to all these videos at once, with one line of code ?

  Update :
  I am already using with success this code to join them together, but only three, if I have more than one hundred, it is time consuming to write down one by one :

  ffmpeg -i vid1.avi -i vid2.avi -i vid3.avi -filter_complex "[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 [v] [a]" -map "[v]" -map "[a]" output.mp4

  but this is joining only the videos, not looping the black screen video. When I do with black screen, ffmpeg gives me stream matching errors.

  update :

  here is the console image :
  

  2nd update :

  a very long list of errors in red, of which a screenshot here :