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• Black/Empty frames at beginning of video file when file Cut using FFmpeg [closed]

  28 octobre 2024, par d0tb0t

  I am cutting a video using ffmpeg and facing the Black/Empty frame at the start issue.

  


  When Codec Copy -

  


  -y -hide_banner -ss 0:1:0 -i file:///private/var/mobile/Containers/Data/PluginKitPlugin/94588A94-C451-426E-9E9C-A7555B6E7C25/tmp/trim.EC876F92-04BE-41F8-ADF3-8CFC84669908.MOV -to 0:1:33 -t 0:0:33 -vcodec copy -acodec copy -avoid_negative_ts make_zero -async 1 file:///var/mobile/Containers/Data/Application/728D5FED-5E6B-4A37-8DE4-E63E47B06DF9/Documents/FILES/FileCopy.mov


  


  When Re-Encoding -

  


  -y -hide_banner -ss 0:1:0 -i file:///private/var/mobile/Containers/Data/PluginKitPlugin/94588A94-C451-426E-9E9C-A7555B6E7C25/tmp/trim.9F2B209B-B657-471A-AE87-7C464FF10812.MOV -to 0:1:33 -t 0:0:33 -vcodec libx264 -vf scale=1280:720 -pix_fmt yuv420p10le -color_range tv -colorspace bt2020nc -color_primaries bt2020 -color_trc arib-std-b67 -crf 28 -preset ultrafast -acodec copy -avoid_negative_ts make_zero -async 1 file:///var/mobile/Containers/Data/Application/728D5FED-5E6B-4A37-8DE4-E63E47B06DF9/Documents/FILES/FileReEncode.mov


  


  Both of the command provides almost the same issue. Provided a sample gif file below to show the scenario.

  


• ffmpeg : Make output file duration that of the file with the longest length [closed]

  27 février 2024, par losercantcode

  I'm going crazy trying to figure this out.

  


  Essentially I'm trying to apply sidechain compression using ffmpeg (for the sake of speed and automation). a2.mp3 in this example is the full length track and a1.wav is a short 5 second, spoken-word clip. The code currently applies the sidechain compression well, but the output file is only that of the spoken-word clips length, so 5 seconds. Is it at all possible to make the output match that of a2.mp3's length instead ? Switching around the input order is not something that's possible as it'll apply the compression to the incorrect track.

  


  Essentially, i'm trying to make it so i'm just layering the spoken-word file on top of the audio track without having to pre-pad the file. I'd rather, if it's possible, this just happen with one block of code within the in one program. I'm interested to see if this is at all possible within ffmpeg.

  


  ffmpeg -i a2.mp3 -i a1.wav -filter_complex "[1:a]asplit=2[sc][mix];[0:a][sc]sidechaincompress=threshold=0.000976563:ratio=10:level_sc=0.015625:release=100:attack=10[compr];[compr][mix]amix=duration=longest[aout]" -map "[aout]" output.wav


  


  a1.wav is mon, a2.mp3 is stereo.

  


  Attempted to implement amix=duration=longest to no avail. Research similar problems on the Stack Exchange that gave unrelated answers.

  


• how to merge audio and video file in python using ffmpeg ?

  5 août 2020, par arvind8

  I am trying to create a python script which merge the audio and video file in one (audio+video) file.

  


  And i am using ffmpeg to achieve this but it is not working and i am getting a errors.
while running this script here is my script.

  


  import os
import subprocess
import time
from datetime import datetime
def merge_all():
    
 global p
 p =subprocess.Popen('ffmpeg -i temp_vid.mp4 -i temp_voice.wav -c:v copy -c:a aac -strict experimental - 
 strftime 1 ' + dt_file_name ,stdin=subprocess.PIPE,creationflags = subprocess.CREATE_NO_WINDOW)
  time.sleep(2)
  print('merging done')
  os.remove('temp_vid.mp4')
  os.remove('temp_voice.wav')
  print('file delete done')>


  


  here is the error

  


  Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\kp\AppData\Local\Programs\Python\Python38\lib\tkinter\__init__.py", line 1883, in __call__
    return self.func(*args)

  File "C:\Users\kp\Desktop\test.py", line 179, in change_icon
    merge_all()

  File "C:\Users\kp\Desktop\test.py", line 104, in merge_all
 
p =subprocess.Popen('ffmpeg -i temp_vid.mp4 -i temp_voice.wav -c:v copy -c:a aac -strict experimental -strftime 1 ' + dt_file_name ,stdin=subprocess.PIPE,creationflags = subprocess.CREATE_NO_WINDOW)

  File "C:\Users\kp\AppData\Local\Programs\Python\Python38\lib\subprocess.py", line 854, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,

  File "C:\Users\kp\AppData\Local\Programs\Python\Python38\lib\subprocess.py", line 1307, in _execute_child

hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
FileNotFoundError: [WinError 2] The system cannot find the file specified