bugNormalize Audio - Bugs: bug #37267, normalize-mp3 uses a hardcoded...

 
 

bug #37267: normalize-mp3 uses a hardcoded default bitrate

Submitted by:  Joachim Reichel <joachim_r>
Submitted on:  Mon 03 Sep 2012 07:23:52 PM UTC  
 
Severity: 3 - NormalStatus: Wont Fix
Privacy: PublicAssigned to: Chris Vaill <cvaill>
Open/Closed: Closed

Add a New Comment(Rich Markup)
   

You are not logged in

Please log in, so followups can be emailed to you.

 

Wed 05 Sep 2012 03:39:03 AM UTC, comment #1:

I see what you're saying, but I don't think this is worth doing.

When we say we want to use the bitrate of the input file, we're really talking about reproducing the conditions under which the original mp3 was encoded. In general (e.g. for a VBR-encoded mp3 or an ogg vorbis file), the bitrate doesn't tell us that, and we're just creating an output file that happens to have the same size but is not necessarily encoded like the original. There are some heuristics we could use, rummaging around for id3 and lame tags and the like, but in general we can't make the output encoded like the input.

And even if we could, data is lost regardless, since we're doing a lossy re-encoding. If someone uses normalize-mp3 expecting not to lose data, they're doing the wrong thing. Possibly that could be made more clear somehow, and that people who really care about the exact encoding options used by normalize-mp3 should modify the script.

I guess I should say that I never use normalize-mp3 myself. It always seemed like kind of a bad idea, but years ago I got a lot of requests to help automate the decode-normalize-reencode process, so I threw it together. It's caused some confusion, and I'm somewhat inclined to remove it in future versions.

All of which is not to say that I wouldn't accept patches to it, but I'm unlikely to find time to hack on normalize-mp3 further myself.

By the way, thank you for your work as debian maintainer. I've been a loyal debian fan since I converted from slackware way back when :-)

Chris Vaill <cvaill>
Project AdministratorIn charge of this item.
Mon 03 Sep 2012 07:23:52 PM UTC, original submission:

Orginal bug report:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=686452

normalize-mp3 uses a hardcoded default bitrate (128bit/s) which is not very user-friendly (data is lost if the input data had a higher bitrate). It would be much better if the default bitrate would be based on the bitrate of the input file.

Joachim Reichel <joachim_r>

 

(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attach File(s):
   
   
Comment:
   

No files currently attached

 

Depends on the following items: None found

Items that depend on this one: None found

 

Carbon-Copy List
  • -unavailable- added by cvaill (Posted a comment)
  • -unavailable- added by joachim_r (Submitted the item)
  •  

    Do you think this task is very important?
    If so, you can click here to add your encouragement to it.
    This task has 0 encouragements so far.

    Only logged-in users can vote.

     

    Please enter the title of George Orwell's famous dystopian book (it's a date):

     

     

    Follow 3 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Wed 05 Sep 2012 03:39:03 AM UTCcvaillStatusNone=>Wont Fix
      Assigned toNone=>cvaill
      Open/ClosedOpen=>Closed

    Back to the top


    Powered by Savane 3.1-cleanup1