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Bug
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Resolution: Won't Fix
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Normal
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None
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3.0
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None
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Linux - Picard version: 3.0.0.dev5 install with pip
1. The files were purchased via Bandcamp and downloaded as Flac.
2. Decompressed to wav on my own (flac -d).
3. Compressed on my own to flac (latest git) (flac -8).
metaflac --show:
METADATA block #0 type: 0 (STREAMINFO) is last: false length: 34 minimum blocksize: 4096 samples maximum blocksize: 4096 samples minimum framesize: 646 bytes maximum framesize: 19666 bytes sample_rate: 44100 Hz channels: 2 bits-per-sample: 24 total samples: 468766 MD5 signature: 248b43cdf2c08c591ac11f356f819ced METADATA block #1 type: 4 (VORBIS_COMMENT) is last: false length: 91 vendor string: reference libFLAC git-aa414e46 20241229 comments: 1 comment[0]: WAVEFORMATEXTENSIBLE_CHANNEL_MASK=0x0003 METADATA block #2 type: 1 (PADDING) is last: true length: 8192
There is one comment as tag
comment[0]: WAVEFORMATEXTENSIBLE_CHANNEL_MASK=0x0003
which don't show up on picard and don't get cleared if i process the file through picard.
My guess the art/type/content of comment is unimportant.
Maybe it's the flac version (latest git) or that there are no seekpoints?
My picard "Tags" settings are only:
- Write tags to files
- Clear existing tags
- Remove ID3 tags from FLAC files
Found this old report but it wasn't helping me.
- is related to
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- Closed
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PICARD-2623 Don't remove itunsmpb tag in m4a files by default (as it breaks gapless playback)
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- Open
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[PICARD-3024] WAVEFORMATEXTENSIBLE_CHANNEL_MASK tag don't show up and therefor not cleared
WAVEFORMATEXTENSIBLE_CHANNEL_MASK is intitionally not cleared and gets preserved even if "Clear existing tags" is active. The reason is that it essentially not typical metadata but a technical detail of the FLAC file.
The WAVEFORMATEXTENSIBLE_CHANNEL_MASK defines the channel setup for multi-channel audio, specifically if the audio channels differ from the default. See also https://www.ietf.org/rfc/rfc9639.html#channel-mask
Clearing this tag is hence direct impact on the audio output, which is not what is expected when clearing metadata.
I could imagine a feature (or likely a plugin) where Picard would be able to edit the channel configuration of FLAC files. But the general behavior that this field does not get cleared with "Clear existing tags" will not change.
If you really want to clear this tag, please use a different tool, e.g. the metaflac command.
EDIT: See PICARD-1326
Okay guess i have it try this and import the out.flac into picard 3.0.0-dev5 (6307a50fba7366b435226f5a8f4cf8d3d1509d46). The tag WAVEFORMATEXTENSIBLE_CHANNEL_MASK is ignored and keep even if you want "Clear existing tags".
ffmpeg -f lavfi -i "sine=f=1000:d=2" -ac 2 out.wav
flac -8 out.wav
metaflac --remove --block-type=SEEKTABLE,PICTURE,PADDING --dont-use-padding out.flac
metaflac --set-tag=WAVEFORMATEXTENSIBLE_CHANNEL_MASK=0x0003 out.flac
Okay this is hard to reproduce i try:
create wav
ffmpeg -f lavfi -i "sine=f=1000:d=2" -ac 2 out.wav
compress to flac (Without --keep-foreign-metadata)*
flac -8
remove SEEKTABLE,PICTURE,PADDING
metaflac --remove --block-type=SEEKTABLE,PICTURE,PADDING --dont-use-padding out.flac
add tag
metaflac --set-tag=TEST=TEST out.flac
and picard show it and clean it so no bug here.
But still don't know what's wrong with my original files.
We actually might consider adding this tag to the preserved tags list by default, instead of hard coding it, though. See also similar discussion on PICARD-2623
That way users could configure the removal (on their own risk).