Initial commit

music-normalize/main.py

@@ -0,0 +1,84 @@
+#!/usr/bin/env python3
+
+# ffmpeg wrapper
+from os import sched_get_priority_max
+import ffmpy
+
+# argument parsing
+import argparse
+
+# executing some commands
+import subprocess
+
+"""
+parser = argparse.ArgumentParser(description="")
+
+# Input file
+parser.add_argument("-i", "--input-file", required=True, type=str, help="Input file")
+
+args = parser.parse_args()
+
+inputfile = args.input_file
+"""
+"""
+ffmpeg -y -i FalKKonE\ -\ 01\ Aria\ \(From\ \"Berserk:\ The\ Golden\ Age\ Arc\"\).flac -pass 1 -filter:a loudnorm=print_format=json -f flac /dev/null
+
+ffmpeg -i FalKKonE\ -\ 01\ Aria\ \(From\ \"Berserk:\ The\ Golden\ Age\ Arc\"\).flac -pass 2 -filter:a loudnorm=I=-30.0:linear=true:measured_I=-4.52:measured_LRA=1.90:measured_thresh=-14.64 -c:a libopus -b:a 320k test441.opus
+ffmpeg -i $FILE -c:v libx264 -b:v 4000k -pass 2 -filter:a loudnorm=linear=true:measured_I=$input_i:measured_LRA=$input_lra:measured_tp=$input_tp:measured_thresh=$input_thresh -c:a aac -b:a 256k $FILE.mkv
+"""
+
+# FIXME
+inputfile = (
+    '/home/marc/Downloads/FalKKonE - 01 Aria (From "Berserk: The Golden Age Arc").flac'
+)
+inputfile = "/home/marc/Downloads/test441.opus"
+
+
+def get_format(inputfile):
+    # get codec format
+    # https://stackoverflow.com/a/29610897
+    # this shows the codecs of all audio streams present in the file, which shouldn't matter unless you have more than one stream
+    ff = ffmpy.FFprobe(
+        inputs={inputfile: None},
+        global_options=(
+            "-v",
+            "quiet",
+            "-select_streams a",
+            "-show_entries stream=codec_name",
+            "-of default=noprint_wrappers=1:nokey=1",
+        ),
+    )
+    # print(ff.cmd)
+    proc = subprocess.Popen(ff.cmd, shell=True, stdout=subprocess.PIPE)
+    # NOTE read output from previous command
+    # rstrip: remove trailing newline
+    # decode: convert from binary string to normal string
+    format: str = (
+        proc.stdout.read()  # pyright: ignore[reportOptionalMemberAccess]
+        .rstrip()
+        .decode("utf8")
+    )
+    # print(format)
+    return format
+
+
+def loudness_info(inputfile):
+    # get format from file
+    # inputformat = get_format(inputfile)
+    # NOTE format is actually unnecessary here
+    ff = ffmpy.FFmpeg(
+        inputs={inputfile: None},
+        outputs={"/dev/null": "-pass 1 -filter:a loudnorm=print_format=json -f null"},
+        global_options=("-y"),
+    )
+
+    print(ff.cmd)
+
+
+def convert():
+    # ff = ffmpy.FFmpeg()
+    pass
+
+
+if __name__ == "__main__":
+    loudness_info(inputfile)

music-normalize/notes.md

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+# Normalize my music with ffmpeg and python
+
+[Loudnorm Filter](https://ffmpeg.org/ffmpeg-filters.html#loudnorm)  
+
+[Filtering Guide](https://trac.ffmpeg.org/wiki/FilteringGuide)  
+
+
+[Two pass loudnorm](https://superuser.com/a/1312885)  
+`ffmpeg -y -i FalKKonE\ -\ 01\ Aria\ \(From\ \"Berserk:\ The\ Golden\ Age\ Arc\"\).flac -pass 1 -filter:a loudnorm=print_format=json -f flac /dev/null`  
+
+`ffmpeg -i FalKKonE\ -\ 01\ Aria\ \(From\ \"Berserk:\ The\ Golden\ Age\ Arc\"\).flac -pass 2 -filter:a loudnorm=I=-30.0:linear=true:measured_I=-4.52:measured_LRA=1.90:measured_thresh=-14.64 -c:a libopus -b:a 320k test441.opus`  
+
+