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fix: aac convent vbr to cbr bug

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This commit is contained in:
WorldObservationLog
2024-05-19 03:36:15 +08:00
parent 94a6ab1c8a
commit afd1213e5f
2 changed files with 28 additions and 3 deletions
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27
src/mp4.py
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@@ -87,8 +87,9 @@ def extract_song(raw_song: bytes, codec: str) -> SongInfo:
match codec:
case Codec.ALAC:
alac_atom_name = (Path(tmp_dir.name) / Path(mp4_name).with_suffix('.atom')).absolute()
subprocess.run(f"mp4extract moov/trak/mdia/minf/stbl/stsd/enca[0]/alac {raw_mp4.absolute()} {alac_atom_name}",
stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
subprocess.run(
f"mp4extract moov/trak/mdia/minf/stbl/stsd/enca[0]/alac {raw_mp4.absolute()} {alac_atom_name}",
stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
with open(alac_atom_name, "rb") as f:
decoder_params = f.read()
case Codec.AAC | Codec.AAC_DOWNMIX | Codec.AAC_BINAURAL:
@@ -209,3 +210,25 @@ def fix_encapsulate(song: bytes) -> bytes:
new_song_name.absolute()], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
with open(new_song_name.absolute(), "rb") as f:
return f.read()
# FFMPEG will overwrite maxBitrate in DecoderConfigDescriptor
# Using raw song's esds box to fix it
# see also https://trac.ffmpeg.org/ticket/4894
def fix_esds_box(raw_song: bytes, song: bytes) -> bytes:
tmp_dir = TemporaryDirectory()
name = uuid.uuid4().hex
esds_name = Path(tmp_dir.name) / Path(f"{name}.atom")
raw_song_name = Path(tmp_dir.name) / Path(f"{name}_raw.m4a")
song_name = Path(tmp_dir.name) / Path(f"{name}.m4a")
final_song_name = Path(tmp_dir.name) / Path(f"{name}_final.m4a")
with open(raw_song_name.absolute(), "wb") as f:
f.write(raw_song)
with open(song_name.absolute(), "wb") as f:
f.write(song)
subprocess.run(
f"mp4extract moov/trak/mdia/minf/stbl/stsd/enca[0]/esds {raw_song_name.absolute()} {esds_name.absolute()}", stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
subprocess.run(f"mp4edit --replace moov/trak/mdia/minf/stbl/stsd/mp4a/esds:{esds_name.absolute()} {song_name.absolute()} {final_song_name.absolute()}",
stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
with open(final_song_name.absolute(), "rb") as f:
return f.read()