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• Trying to trim a video using FFMpeg in Python in a loop using variables as the start frame and end frame

  29 juin 2022, par LearningPython

  I'm writing a program using Python. I need to use FFMpeg as part of a loop within my program. I want FFMpeg to take my video file and create a new output each loop, using variables as the start and end point (as specific frames) How can I do this ? I found some other code online which I think is on the right track but I need some help.

  


  ffmpeg_start = start_sample / 29.97
ffmpeg_end = end_sample / 29.97

import os

path = '/Users/a/Downloads/Video'

for filename in os.listdir(path):
    if filename.endswith(".mp4"):
        command = "ffmpeg -fflags +discardcorrupt -i " + os.path.join(path, filename) + " -c copy -map 0 -ss {ffmpeg_start} -t {ffmpeg_end} -f segment -reset_timestamps 1 " + os.path.join(path, "output%03d.mp4")
        os.system(command)
    else:
        continue


  


  The error I'm currently getting is : "Invalid duration specification for ss : ffmpeg_start"
Thanks in advance !

  


• Removing / Overlaying logo on mp4 video format with ffmpeg on linux

  13 juillet 2016, par SilverShadow

  I’m trying to remove logo from an .mp4 video format with ffmpeg on linux machine without re-encoding (for preserving the same quality) with the following command :

  ffmpeg -i input.mp4 -vf delogo=x=270:y=190:w=40:h=40 -c:a copy output.mp4

  and it give me the following errors :

  Unrecognized option 'vf'

  then a new error came up :

  Unable to find a suitable output format for 'delogo=x=270:y=190:w=40:h=40'

  ffmpeg always updating and it seems that they change command line arguments alot so any material or tutorial i find online seems to get out-dated quickly

  I review their website documentation but can’t get it to work, I think i’m missing something...?

  so what is the correct command line in linux shell also, how to view or find out exactly the area coordinates to be removed before actually removing logo/overlaying it and keep testing every while

  and how to overlay a solid color in certain area instead of removing logo transparently as well ?

• How to combine a .mp4 video with a .wav audio with an offset in ffmpeg from command line ?

  15 mars 2014, par minder42

  I've got a TV clip in mp4 format containing audio and video, and an WAV audio_commentary track.

  I've been trying to combine them in ffmpeg and then play it online with a flash player (which can only take h264 format)

  What's the best ffmpeg command to accomplish this ? My inputs are MP4 video, WAV audio, and an offset in seconds, the time the audio commentary starts relative to the start of the mp4 video.

  I tried

  ffmpeg -i input_audio.wav -i input_vid.mp4 -vcodec copy output.mp4

  and

  ffmpeg -vcodec copy -ss offset -i input_audio.wav -i input_video.mp4 output.mp4

  nether of these do what I want and output the video in the h264 format that is good for flash players- Is there a way to do this from command line in ffmpeg ?