Bugs item #1861450, was opened at 2007-12-31 17:35
Message generated for change (Settings changed) made by robert
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Category: None
Group: None
>Status: Closed
Resolution: Fixed
Priority: 5
Private: No
Submitted By: Darryl O'Neill (darryl_oneill)
Assigned to: Nobody/Anonymous (nobody)
Summary: TLEN tag fixed on encode from stdin with ID3v2 tags
Initial Comment:
Every file that encodes has the mp3 TLEN tag set to 97391548 this is 97391.548 seconds or 27 hours, 3 minutes and 11.548 seconds.
Windows Media player rounds this up and shows 27:03:12. The duration tab in Windows explorer rounds down and wraps the hours past 24 to 3 so it shows 3:03:11.
This occurs if you encode from stdin with the --add-id3v2 option or if the title is greater than 30 characters which forces a ID3v2 tag. If you encode from a file it seems to be correct.
I am using MediaCoder which encodes MP3 from stdin.
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Comment By: Darryl O'Neill (darryl_oneill)
Date: 2008-01-04 06:12
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I got the code compiled and it seems to work.
Thanks
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Comment By: Robert Hegemann (robert)
Date: 2008-01-02 20:36
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There is a fix for this issue in cvs main branch now.
Note, if you feed raw PCM via stdin into LAME and do some advanced VBR
encoding, then Windows will likely show the wrong duration, because it
either reads the TLEN tag info--which isn't there in this case--or does
some ugly hack which works for CBR only. Feeding normal WAVE/AIFF files via
stdin does work OK.
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Comment By: Darryl O'Neill (darryl_oneill)
Date: 2008-01-02 18:55
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Sorry. I should have provided that to begin with. I am using Lame 3.98
Beta 6.
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Comment By: Robert Hegemann (robert)
Date: 2008-01-02 16:25
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Sorry, I haven't asked before: What LAME version are you using?
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Comment By: Darryl O'Neill (darryl_oneill)
Date: 2008-01-02 15:59
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MediaCoder writes raw PCM to stdin. I modified the mp3 file with a hex
editor and renamed the TLEN tag. After saving Windows Explorer and Windows
Media Player get the correct duration. Would it be possible to omit the
TLEN tag if the length is unknown. I think that this would fix the
problem.
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Comment By: Robert Hegemann (robert)
Date: 2008-01-02 13:35
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Hey Darryl,
does MediaCoder write a Wave file or raw PCM?
The ID3v2 tag will be written infront of the mp3. At this time, LAME does
not know how long the audio file will be, it looks into the WAVE header and
takes whatever it finds there. In case of raw PCM data, there is not such
information available and LAME can't write a correct TLEN info. LAME would
have to overwrite the ID3v2 after encoding, which it can't do in case LAME
should write to stdout.
Ciao Robert
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