Certainly! I'll provide you with a Python script that uses the `ffmpeg-python` package to automate your video editing tasks. Here's a prompt that describes what you want to do and the script that fulfills those requirements:
```python
import ffmpeg
import argparse
def combine_audio(music_file, voice_file, output_file, music_volume=0.8):
# Combine music and voice with voice starting 1 second later and music at lower volume
input_music = ffmpeg.input(music_file).filter('volume', music_volume)
input_voice = ffmpeg.input(voice_file).filter_('adelay', '1000|1000')
combined_audio = ffmpeg.filter_([input_music, input_voice], 'amix')
# Output the combined audio to a file
ffmpeg.output(combined_audio, output_file).run()
def replace_audio_in_video(video_file, audio_file, output_file):
# Remove the original audio and replace it with the new combined audio
input_video = ffmpeg.input(video_file)
input_audio = ffmpeg.input(audio_file)
# Output the video with the new audio to a file
ffmpeg.output(input_video.video, input_audio.audio, output_file, vcodec='copy').run()
def stretch_video(video_file, output_file, audio_duration):
# Get the duration of the video file
video_stream = ffmpeg.probe(video_file)['streams'][0]
video_duration = float(video_stream['duration'])
# Calculate the stretch factor
stretch_factor = audio_duration / video_duration
# Apply the time stretch to the video
stretched_video = ffmpeg.input(video_file).filter_('setpts', f'PTS*{stretch_factor}')
# Output the stretched video to a file
ffmpeg.output(stretched_video, output_file).run()
def main():
# Parse command-line arguments
parser = argparse.ArgumentParser(description="Automate video editing tasks using FFMPEG with Python.")
parser.add_argument('--music', required=True, help='The music file')
parser.add_argument('--voice', required=True, help='The voice file')
parser.add_argument('--video', required=True, help='The video file')
parser.add_argument('--out', required=True, help='The output video file name')
args = parser.parse_args()
# Combine the audio files
combined_audio_file = 'combined_audio.mp3'
combine_audio(args.music, args.voice, combined_audio_file)
# Replace audio in the video file
video_with_new_audio = 'video_with_new_audio.mp4'
replace_audio_in_video(args.video, combined_audio_file, video_with_new_audio)
# Get the duration of the combined audio
audio_stream = ffmpeg.probe(combined_audio_file)['streams'][0]
audio_duration = float(audio_stream['duration'])
# Stretch the video to match the audio duration
stretch_video(video_with_new_audio, args.out, audio_duration)
print(f"Video editing is complete. The final video is saved as {args.out}")
if __name__ == "__main__":
main()
```
To use this script, save it as `make_video.py`, and run it from the command line with the required arguments. For example:
```bash
python make_video.py --music filename.mp3 --voice voicefile.mp3 --video vidfile.mp4 --out output.mp4
```
Please make sure you have `ffmpeg` and `ffmpeg-python` installed in your environment. You can install `ffmpeg-python` via pip:
```bash
pip install ffmpeg-python
```
This script will combine your audio files with the specified timing and volume adjustments, replace the audio in your video file, and stretch the video to match the duration of the new audio track.
