Created
January 27, 2022 03:18
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simple python script that uses FFmpeg to perform databending
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| import fractions | |
| import subprocess | |
| import json | |
| # input settings | |
| infile = "in.gif" | |
| outfile = "out.mp4" | |
| # databend settings | |
| effect = "biquad" | |
| pix_fmt = "yuv420p" | |
| # convert from input to raw video | |
| p = subprocess.Popen(["ffmpeg", "-hide_banner", "-y", "-i", infile, "-pix_fmt", pix_fmt, "-f", "rawvideo", "pipe:1"], | |
| stdout=subprocess.PIPE) | |
| rawvideo = p.communicate()[0] | |
| # get info from original to reconstruct later | |
| p = subprocess.Popen(['ffprobe', '-v', 'quiet', '-print_format', 'json', '-show_format', '-show_streams', infile], | |
| stdout=subprocess.PIPE) | |
| infoprobe = p.communicate()[0] | |
| info = json.loads(infoprobe) | |
| fps = float(fractions.Fraction(info["streams"][0]["r_frame_rate"])) | |
| width = info["streams"][0]["width"] | |
| height = info["streams"][0]["height"] | |
| # apply effect to audio | |
| p = subprocess.Popen(['ffmpeg', '-hide_banner', '-y', '-f', 'alaw', '-acodec', 'pcm_alaw', | |
| '-i', 'pipe:0', "-af", effect, '-f', 'alaw', "pipe:1"], stdout=subprocess.PIPE, | |
| stdin=subprocess.PIPE) | |
| alaw = p.communicate(input=rawvideo)[0][:len(rawvideo)] | |
| # convert audio back to original | |
| p = subprocess.Popen(['ffmpeg', '-hide_banner', '-y', '-f', 'rawvideo', '-vcodec', 'rawvideo', '-s', | |
| f"{width}x{height}", '-r', str(fps), | |
| '-pix_fmt', pix_fmt, '-i', 'pipe:0', outfile], stdin=subprocess.PIPE) | |
| p.communicate(input=alaw) | |
| # play it | |
| subprocess.Popen(["ffplay", "-loop", "0", "-y", "750", outfile]) |
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