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bitrate carryover

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This commit is contained in:
Peter Wicks
2024-12-30 20:10:19 -07:00
parent 34bc9fd493
commit c667c733ec
1 changed files with 4 additions and 8 deletions
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m4binder.py
+4 -8
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@@ -168,14 +168,11 @@ def create_concat_list(file_paths, list_file):
safe_path = safe_path.replace("'", "'\\''") safe_path = safe_path.replace("'", "'\\''")
f.write(f"file '{safe_path}'\n") f.write(f"file '{safe_path}'\n")
def encode_mp3_to_m4a(mp3_file, out_file, bitrate="96k"): def encode_mp3_to_m4a(mp3_file, out_file):
""" """
Convert a single MP3 file to AAC (.m4a) without altering Convert a single MP3 file to AAC (.m4a) without altering
sample rate/channels if possible. sample rate/channels if possible.
""" """
# if the output file already exists, skip encoding
if os.path.exists(out_file):
print(f"Output file {out_file} already exists. Skipping.")
cmd = [ cmd = [
"ffmpeg", "ffmpeg",
"-hide_banner", "-hide_banner",
@@ -184,12 +181,11 @@ def encode_mp3_to_m4a(mp3_file, out_file, bitrate="96k"):
"-i", mp3_file, # Input MP3 "-i", mp3_file, # Input MP3
"-vn", # This drops any video/art track that might be embedded as H.264: "-vn", # This drops any video/art track that might be embedded as H.264:
"-c:a", "aac", "-c:a", "aac",
"-b:a", bitrate,
out_file out_file
] ]
subprocess.run(cmd, check=True) subprocess.run(cmd, check=True)
def parallel_encode_mp3s_to_m4a(input_folder, output_folder, bitrate="96k", max_workers=None): def parallel_encode_mp3s_to_m4a(input_folder, output_folder, max_workers=None):
""" """
1) Finds all .mp3 in input_folder. 1) Finds all .mp3 in input_folder.
2) Encodes each in parallel to .m4a in output_folder. 2) Encodes each in parallel to .m4a in output_folder.
@@ -211,7 +207,7 @@ def parallel_encode_mp3s_to_m4a(input_folder, output_folder, bitrate="96k", max_
for mp3 in mp3_files: for mp3 in mp3_files:
basename = os.path.splitext(os.path.basename(mp3))[0] basename = os.path.splitext(os.path.basename(mp3))[0]
out_file = os.path.join(output_folder, basename + ".m4a") out_file = os.path.join(output_folder, basename + ".m4a")
fut = executor.submit(encode_mp3_to_m4a, mp3, out_file, bitrate) fut = executor.submit(encode_mp3_to_m4a, mp3, out_file)
futures[fut] = out_file futures[fut] = out_file
# Gather results (this blocks until all are done) # Gather results (this blocks until all are done)
@@ -234,7 +230,7 @@ def convert_mp3_chapters_to_m4b(input_folder, output_file, book_metadata=None):
3) Create concat list 3) Create concat list
4) Use ffmpeg to produce final M4B 4) Use ffmpeg to produce final M4B
""" """
m4a_files = parallel_encode_mp3s_to_m4a(input_folder, input_folder, bitrate="96k") m4a_files = parallel_encode_mp3s_to_m4a(input_folder, input_folder)
metadata_file = os.path.join(input_folder, "chapters.ffmetadata") metadata_file = os.path.join(input_folder, "chapters.ffmetadata")
list_file = os.path.join(input_folder, "concat_list.txt") list_file = os.path.join(input_folder, "concat_list.txt")