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- import os, ffmpeg
- def compress_video(video_full_path, output_file_name, target_size):
- # Reference: https://en.wikipedia.org/wiki/Bit_rate#Encoding_bit_rate
- min_audio_bitrate = 32000
- max_audio_bitrate = 256000
- probe = ffmpeg.probe(video_full_path)
- # Video duration, in s.
- duration = float(probe['format']['duration'])
- # Audio bitrate, in bps.
- audio_bitrate = float(next((s for s in probe['streams'] if s['codec_type'] == 'audio'), None)['bit_rate'])
- # Target total bitrate, in bps.
- target_total_bitrate = (target_size * 1024 * 8) / (1.073741824 * duration)
- # Target audio bitrate, in bps
- if 10 * audio_bitrate > target_total_bitrate:
- audio_bitrate = target_total_bitrate / 10
- if audio_bitrate < min_audio_bitrate < target_total_bitrate:
- audio_bitrate = min_audio_bitrate
- elif audio_bitrate > max_audio_bitrate:
- audio_bitrate = max_audio_bitrate
- # Target video bitrate, in bps.
- video_bitrate = target_total_bitrate - audio_bitrate
- i = ffmpeg.input(video_full_path)
- ffmpeg.output(i, os.devnull,
- **{'c:v': 'libx264', 'b:v': video_bitrate, 'pass': 1, 'f': 'mp4'}
- ).overwrite_output().run()
- ffmpeg.output(i, output_file_name,
- **{'c:v': 'libx264', 'b:v': video_bitrate, 'pass': 2, 'c:a': 'aac', 'b:a': audio_bitrate}
- ).overwrite_output().run()
- # Compress input.mp4 to 50MB and save as output.mp4
- compress_video(r"D:\Python\VideosReplacer\test.mp4", r"D:\Python\VideosReplacer\test_out.mp4", 8 * 1000)
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