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• How we can replace all images with another in video using FFMPEG library ?

  17 juin 2020, par Parth Virani

  Challange

  



  i had search many things on internet for do this above function but still i can't able to make it hear i have attached before video and after video which i want using ffmpeg library

  



  Before Video : https://drive.google.com/file/d/1MIUtuOkw22BiyFTKanDeio-VzYS5vKmn/view?usp=sharing

  



  After Video : https://drive.google.com/file/d/1Vot237PcDPA5BqnLRHlQ1ierYrLIyUj9/view?usp=sharing

  



  keep one thing in mind i only need to change images only the text,effects and sound should be as it as

  


• A specific MP4 file is not playable with avfoundation in iOS

  3 juillet 2020, par Rabel Ahmed

  I have an mp4 video file that I want to play it in iOS using avfoundation. Unfortunately, the file is not being played and unable to save into the default gallery(photos) even it has h264 video codec and aac audio codec. And it is only playable when I reencode it using ffmpeg. I want to know why the file only becomes playable after reencoding the video ?

  


  Not Playable(originalFile.mp4) vs Playable File(outputFile.mp4) Information Comparison

  


  

  


  File is playable with avfoundation when these commands are being applied :

  


  


  1. ffmpeg -y -hide_banner -i originalFile.mp4 -f mp4 -vcodec h264 -vf scale=out_color_matrix=bt709 -color_primaries bt709 -color_trc bt709 -colorspace bt709 -b:v 5703k -acodec aac -b:a 249k outputFile.mp4

     


  


  2. ffmpeg -y -hide_banner -i originalFile.mp4 -f mp4 -vcodec h264 -acodec aac outputFile.mp4

     


  


  


  File is not playable with avfoundation when this command is being applied :

  


  

  1. ffmpeg -y -hide_banner -i originalFile.mp4 -f mp4 -vcodec copy -acodec aac outputFile.mp4

  


  


  originalFile.mp4 file link : https://drive.google.com/file/d/1-yZFL0EsLztMIfwU79Al6dv8gdwJyGAD/view?usp=sharing

  


  ffprobe streams of both files are here
https://www.diffchecker.com/VgZL66QB

  


• Using ffmpeg with chunks of file

  27 juin 2020, par Yashik

  I am trying to download a file as 100mb chunks and I need to convert this using ffmpeg and upload this file to dropbox.
The code I tried :

  


  import os
import requests

#---snip---#

for chunk in r.iter_content(chunksize=chunksize):
  #chunksize is 100mb
  fp = open("a.mp4","wb")
  fp.write(chunk)
  fp.close()
  os.system("ffmpeg -i a.mp4 a.mkv")
  
  #code for uploading


  


  The error is moov atom is not found

  


  1.How can I convert file chunks with ffmpeg ?

  


  2.Can I convert without ever needing to save to a.mp4, like giving chunk directly to ffmpeg ?

  


  Ps : The problem occurs with file size greater than 100mb

  


  Edit :

  


  After converting the file is appended to file in dropbox

  


  What I want :

  


  

  • Sample.mp4 - 200mb

  


  • Downloads file as chunks 100mb

  


  • Converts the chunk

  


  • Upload to drive (multipart)