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• Try to execute ffmpeg in python - subtitles error

  3 septembre 2022, par user103162

  I try to exectute :
./ffmpeg.exe -i "video.mkv" -vf subtitles="video.mkv" "video.mp4"
This command works fine

  


  But not in my python code

  


  
from pathlib import Path
import subprocess
import os


ffmpeg = r"D:\Archives\ffmpeg.exe"
os.chdir(r"D:\temp\video")
videos = Path(".")

for file_mkv in videos.glob("*.mkv"):
    file_mp4 = file_mkv.with_suffix(".mp4")
    subprocess.run([ffmpeg, "-i", file_mkv, "-vf", f'subtitles="{file_mkv}"', file_mp4])



  


  Error :
[Parsed_subtitles_0 @ 0000020cb26222c0] Unable to open "video.mkv"
[AVFilterGraph @ 0000020cb715a380] Error initializing filter 'subtitles' with args '"video.mkv"'
Error reinitializing filters !
Failed to inject frame into filter network : Invalid argument
Error while processing the decoded data for stream #0:0
Conversion failed !

  


• Encoding videos locally or through a third party ?

  7 septembre 2015, par JordanDevelop

  We’re in the process on building a view uploading and sharing community right now and we’re currently developing with idea of using a third-party like Zencoder, but what makes Zencoder a better option ?

  I’m sorry if i butcher up what is involved with supporting a local encoding system, so I’ll try to be vague. We plan on releasing with AWS, so why not setup an instance running ffmpeg ? I understand it’s a lot more then simply that, but if is it that difficult to find someone who can put together an instance for encoding ?

  Am I right to assume most third party encoding services seem very unrealistic, price wise, for a web application who specifically focus on encoding large amounts of media ? I did notice Amazon offers an encoding features and would definitely feel more comfortable using them, but even that seems seems redundant.

  I completely understand the cost behind encoding is very real, but I just can’t understand why third-party encoders are so widely accepted.

• How to build a daemon to encode video files on S3 ?

  4 avril 2013, par Yuval Cohen

  I am interested in running a daemon to go over user uploaded video files and encode them in an optimal format (and add some watermarks).

  I was considering services such as Zencoder, Encoding.com, Amazon's encoding service but some lack overlaying capabilities and some are just too expensive for our (big) volumes.

  I want to build a daemon that encodes videos that are located on S3 once users upload them.

  The solution I thought of would be Python Heroku servers using Celery for a task queue to keep track of the encoded files and ffmpeg to do the actual work. However, I ran into troubles compiling ffmpeg for Heroku (with libass support, so the basic ffmpeg bins aren't enough).

  What approach/technology stack would you consider for this mini-project ?

  Thanks !
  Yuval