Recherche avancée

Sur d’autres sites (3859)

• how to resolve error FileNotFoundError : [WinError 2] The system cannot find the file specified when using ffmpeg-python ?

  24 juillet 2021, par Geo

  I'm trying to merge video and audio files together using ffmprg but I keep on receiving this error

  


  ERROR :

  


  Traceback (most recent call last):&#xA;  File "C:\Users\Geo\youtubedownloader\test.py", line 9, in <module>&#xA;    ffmpeg.concat(video,audio, v=1 , a=1).output("C:/Users/Geo/output_video/mergedretweett.mp4/").run()&#xA;  File "C:\Users\Geo\AppData\Local\Programs\Python\Python39\lib\site-packages\ffmpeg\_run.py", line 313, in run&#xA;    process = run_async(&#xA;  File "C:\Users\Geo\AppData\Local\Programs\Python\Python39\lib\site-packages\ffmpeg\_run.py", line 284, in run_async&#xA;    return subprocess.Popen(&#xA;  File "C:\Users\Geo\AppData\Local\Programs\Python\Python39\lib\subprocess.py", line 947, in __init__&#xA;    self._execute_child(args, executable, preexec_fn, close_fds,&#xA;  File "C:\Users\Geo\AppData\Local\Programs\Python\Python39\lib\subprocess.py", line 1416, in _execute_child&#xA;    hp, ht, pid, tid = _winapi.CreateProcess(executable, args,&#xA;FileNotFoundError: [WinError 2] The system cannot find the file specified&#xA;</module>

  


  Code :

  


  

video = ffmpeg.input("C:/Users/Geo/File.mp4")

audio = ffmpeg.input("C:/Users/Geo/File_audio.mp4")


ffmpeg.concat(video,audio, v=1 , a=1).output("C:/Users/Geo/output_video/outputvideo.mp4").run()```




  


• How to manually reset the offset of an mp4 video created from m4s files ?

  12 août 2020, par natdev

  I'm building a service that combine .m4s files (from a dash stream) to a mp4 video.
  
I have some sample m4s files from a random point in time of a stream,
  
using ffmpeg on those file + the init file does the job.

  


  cat init.mp4 032.m4s 033.m4s 034.m4s > output.mp4


  


  I have tried concating the m4s files to the mp4 init file and I manage to play the video,
  
but there is an offset from the encoded video segments.

  


  I guess ffmpeg does reset that somehow, and I was wondering how can I reset that offset as well ?
  
Having a little bit of experience with dash, I know that there is a field name presentationTimeOffset that is responsible to set the offset.

  


• ffmpeg : Converting animated GIF files to video while upscaling produces a file with inaccurate colors

  14 juin 2020, par Metamoran

  I apologize if this is a dumb question, but even after using the search function I have not seen anyone asking about this.

  



  I'm trying to both 
(1) : Convert some low-resolution animated GIF files (pixel art in particular) to video, and
(2) : Upscale them at the same time, using nearest-neighbor to preserve the hard edges.

  



  ffmpeg does everything with no warnings or errors whatsoever, but the end result's colors look off. If I convert without upscaling, the color accuracy is preserved. I have tried both using and NOT using "palettegen", but it does not make a difference. For brevity, I'm only pasting the lines with palettegen in them. The end results are the same either way.

  



  This is what I've been using for upscaling :

  



  ffmpeg -i input.gif -c:v libx264 -b:v 10000K -y -vf "split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse,scale=2*iw:2*ih:flags=neighbor" output.mp4


  



  This is what I used for testing conversion (with no upscaling) :

  



  ffmpeg -i input.gif -c:v libx264 -b:v 10000K -y -vf "split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" output.mp4


  



  Here's the input file :

  



  Original animated GIF file

  



  Here's a screenshot of how the final video looks if I don't upscale (colors look exactly like in the input file) :

  



  Screenshot - Final - No Upscaling

  



  And here's the result if I upscale (2x Nearest-Neighbor upscaling, with the screenshot downsized 50% to make comparison easier. Colors were not altered during the process.) :

  



  Screenshot - Final - 2x Upscaling (Nearest-Neighbor) [Downsized]

  



  Folder with all relevant files :
Google Drive

  



  Is there something I'm missing ? Or is there some sort of technical limitation, a step that will alter the colors of the video no matter what I try ? I'm not technically inclined, I'd like to know if that is the case. Thank you for your time.