Bug 23 - Support --replay-gain in flac encoding
Summary: Support --replay-gain in flac encoding
Status: CONFIRMED
Alias: None
Product: Asunder
Classification: Unclassified
Component: All (show other bugs)
Version: 2.7
Hardware: PC Linux
: enhancement
Assignee: Andrew Smith
URL:
Depends on:
Blocks:
 
Reported: 2015-11-28 21:22 EST by Orion Poplawski
Modified: 2015-12-05 15:35 EST (History)
1 user (show)

See Also:


Attachments

Description Orion Poplawski 2015-11-28 21:22:25 EST
I'd like to be able to use the --replay-gain argument when encoding my flac files.
Comment 1 Andrew Smith 2015-12-05 15:35:34 EST
Hi Orion

You're not the only one who asked for this, I'll paste into here an email thread about this. Basically I don't know exactly how it would work and if I did - what the user interface for it would be.

Andrew

-------------------



Hi Andrew,

You're welcome.  I'll keep an eye out for an update, but in the mean
time i'll stick to my postprocessing script.




On Mon, 13 May 2013 21:42:20 -0400
Andrew Smith <andrew@littlesvr.ca> wrote:

> Hi Reinout
>
> Thanks for running that test. I'll put this on the todo list, who
> knows, maybe one day I'll find some spare time to implement something
> useful like this.
>
> Cheers,
>
> Andrew
>
> Le 2013-05-13 13:46, Reinout Wijnveen a écrit :
>> Hi Andrew,
>>
>> Thanks for getting back to me.
>> That's actually a pretty good question you're asking.
>>
>> Normally there are two separate gain tags per track computed: track
>> gain album gain. That does make sense because the individual
>> loudness can vary from track to track within an album.
>>
>> For album gain you do indeed need the other tracks of the album as a
>> 'context' in order to keep the loudness variations within the album
>> intact.
>>
>> Currently i use something like 'metaflac --add-replay-gain *flac'
>> inside a folder containing an album, so i guess metaflac has that
>> context, since it receives all the files on the commandline at
>> once. It can analyse them all and the tags when all information is
>> available.
>>
>> So i decided to do a test. I ripped a CD to flac and wav.
>> On the flac output i performed the metaflac command as above.  The
>> wav files were encoded one by one with the command: flac
>> --replay-gain -8 <file>  (Simulating the ripping method of asunder)
>>
>> The result is indeed different:
>> metaflac:
>> metaflac --list 0*.flac |grep _GAIN
>> 01.flac:    comment[4]: REPLAYGAIN_TRACK_GAIN=-1.63 dB
>> 01.flac:    comment[6]: REPLAYGAIN_ALBUM_GAIN=-1.98 dB
>> 02.flac:    comment[4]: REPLAYGAIN_TRACK_GAIN=-0.38 dB
>> 02.flac:    comment[6]: REPLAYGAIN_ALBUM_GAIN=-1.98 dB
>> 03.flac:    comment[4]: REPLAYGAIN_TRACK_GAIN=-2.88 dB
>> 03.flac:    comment[6]: REPLAYGAIN_ALBUM_GAIN=-1.98 dB
>> 04.flac:    comment[4]: REPLAYGAIN_TRACK_GAIN=-1.98 dB
>> 04.flac:    comment[6]: REPLAYGAIN_ALBUM_GAIN=-1.98 dB
>> 05.flac:    comment[4]: REPLAYGAIN_TRACK_GAIN=-1.41 dB
>> 05.flac:    comment[6]: REPLAYGAIN_ALBUM_GAIN=-1.98 dB
>> 06.flac:    comment[4]: REPLAYGAIN_TRACK_GAIN=-2.56 dB
>> 06.flac:    comment[6]: REPLAYGAIN_ALBUM_GAIN=-1.98 dB
>> 07.flac:    comment[4]: REPLAYGAIN_TRACK_GAIN=-2.49 dB
>> 07.flac:    comment[6]: REPLAYGAIN_ALBUM_GAIN=-1.98 dB
>> 08.flac:    comment[4]: REPLAYGAIN_TRACK_GAIN=-1.97 dB
>> 08.flac:    comment[6]: REPLAYGAIN_ALBUM_GAIN=-1.98 dB
>> 09.flac:    comment[4]: REPLAYGAIN_TRACK_GAIN=-1.80 dB
>> 09.flac:    comment[6]: REPLAYGAIN_ALBUM_GAIN=-1.98 dB
>>
>> Individual encoding with adding gain tag:
>> metaflac --list 0*.flac |grep _GAIN
>> 01.flac:    comment[1]: REPLAYGAIN_TRACK_GAIN=-1.63 dB
>> 01.flac:    comment[3]: REPLAYGAIN_ALBUM_GAIN=-1.63 dB
>> 02.flac:    comment[1]: REPLAYGAIN_TRACK_GAIN=-0.38 dB
>> 02.flac:    comment[3]: REPLAYGAIN_ALBUM_GAIN=-0.38 dB
>> 03.flac:    comment[1]: REPLAYGAIN_TRACK_GAIN=-2.88 dB
>> 03.flac:    comment[3]: REPLAYGAIN_ALBUM_GAIN=-2.88 dB
>> 04.flac:    comment[1]: REPLAYGAIN_TRACK_GAIN=-1.98 dB
>> 04.flac:    comment[3]: REPLAYGAIN_ALBUM_GAIN=-1.98 dB
>> 05.flac:    comment[1]: REPLAYGAIN_TRACK_GAIN=-1.41 dB
>> 05.flac:    comment[3]: REPLAYGAIN_ALBUM_GAIN=-1.41 dB
>> 06.flac:    comment[1]: REPLAYGAIN_TRACK_GAIN=-2.56 dB
>> 06.flac:    comment[3]: REPLAYGAIN_ALBUM_GAIN=-2.56 dB
>> 07.flac:    comment[1]: REPLAYGAIN_TRACK_GAIN=-2.49 dB
>> 07.flac:    comment[3]: REPLAYGAIN_ALBUM_GAIN=-2.49 dB
>> 08.flac:    comment[1]: REPLAYGAIN_TRACK_GAIN=-1.97 dB
>> 08.flac:    comment[3]: REPLAYGAIN_ALBUM_GAIN=-1.97 dB
>> 09.flac:    comment[1]: REPLAYGAIN_TRACK_GAIN=-1.80 dB
>> 09.flac:    comment[3]: REPLAYGAIN_ALBUM_GAIN=-1.80 dB
>>
>> The one by one method just sets the album gain equal to the track
>> gain and is therefore less accurate.
>> So what i suggested turns out to be more of a quick and dirty
>> hack. Adding an accurate gain calculation to Asunder requires more
>> work and the presence of a metaflac command.
>>
>>
>>
>> On Sun, 12 May 2013 16:25:23 -0400
>> Andrew Smith <andrew@littlesvr.ca> wrote:
>>
>>> Hi Reinout
>>>
>>> Sorry for the late reply.
>>>
>>> I'm not familiar with replaygain and reading about it quickly am
>>> not sure I understand completely.
>>>
>>> Would it be of any use to pass --replay-gain to flac if I'm only
>>> doing one file at a time? Or does it only make sense if I'm
>>> encoding an entire album at the same time?
>>>
>>> Cheers,
>>>
>>> Andrew
>>>
>>>> Hi Andrew,
>>>>
>>>> I have been using asunder to rip my CD's for over a year now. It
>>>> works quite well for me. I switched to asunder from other tools
>>>> the moment i decided to go lossless and realized i needed mp3 for
>>>> the car and could use flac at home. The only thing that bothers
>>>> me is that i need to postprocess the flac files with metaflac to
>>>> add replaygain. lame can add gain tags by default. The flac
>>>> encoder can add gain tags, but always needs a separate
>>>> commandline option (--replay-gain). I have been looking through
>>>> the GUI and the config file, but i don't think i can add that in
>>>> asunder. It would be nice to have an optional free text field
>>>> (per file format/encoder) where the user can enter commandline
>>>> options. Unfortunately i'm not at all fluent in C, so i'm unable
>>>> to send you the diffs :-(
>>>>
>>>> Anyway: thanks for creating asunder.
>>>> Regards,
>>>> Reinout
>>>>
>>
>>
>>



-- 
Regards,

Reinout Wijnveen

"All who believe in psychokinesis raise my hand"

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