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Topic: GXLame - Low-bitrate MP3 encoder. (Read 50083 times) previous topic - next topic
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Re: GXLame - Low-bitrate MP3 encoder.

Reply #75
Just a little more gentle on the audio compressor/expander gig (especially not make loud sounds louder) and then perhaps most internet radio stations will want it. 

I experimented with cutting the input gain further to compensate, resulting in unheard-of 39kbps bitrate @ 22k bitdepth resolving rather similar to CD quality. 

Had I bought a CD that sounded like that, I'd be satisfied.  But as this is a codec, I'd like an adjustment/flag so that the loudest of sounds don't get boosted so much. 

Otherwise, ridiculously high quality for 40kb-ish bitrate mp3's. 
I just can't figure out how to prevent loudest of sounds getting louder. 

Re: GXLame - Low-bitrate MP3 encoder.

Reply #76
I'm interested how to encode mp3 at 128 kbps vbr or mp3 320 kbps with your encoder in foobar2000 can you send the screenshots, please?

Re: GXLame - Low-bitrate MP3 encoder.

Reply #77
I'm interested how to encode mp3 at 128 kbps vbr...
Foobar2000
r-click song(s)
convert
output format
add new
encoder=custom
GXLame-t5.3.exe -S -b32 -F --noreplaygain -V50 - %d
Highest BPS mode 16 (like a CD)

*see post#1 for alternatives to -V50, such as -V20 for 85kbps (the default setting).
...or mp3 320 kbps with...
GXlame is for very small size files, so 320 is opposite of purpose.  Consider WavPack lossy quality-max @ 460kbps (slow but excellent), or FLAC for your archive purposes.
Higher quality original is more successful for later transcode to fit more into portable devices (especially don't use same codec for both). 

Re: GXLame - Low-bitrate MP3 encoder.

Reply #78
https://imgur.com/a/TqTkLUL
An error occurred while writing to file (The encoder has terminated prematurely with code 1 (0x00000001); please re-check parameters)

Re: GXLame - Low-bitrate MP3 encoder.

Reply #79
"-s" is not equal to "-S".

 

Re: GXLame - Low-bitrate MP3 encoder.

Reply #80
Also, there should be no encoder name ("GXLame-t5.3.exe") in parameters.

Re: GXLame - Low-bitrate MP3 encoder.

Reply #81
For successful mp3 bit-rates below 80kbps, you'd need to use the Foobar2000 converter with
advanced limiter + Resampler PPHS (click ultra too)

With the bitdepth resampler, a setting of 32000 opens up bitrates under 80kbps, or
With the bitdepth resampler, a setting of 22050 opens up bitrates under 48kbps
That is true of most codecs; with the major difference that GXLame doesn't cut-off the treble. 

The default -V20 is problematic.  Lowest useful is -V26 (in my opinion).  At -V26 or higher, my dynamics problem evaporated. 

GXLame makes possible bitrates under 48kbps still similar to tape/FM quality.  So, it is possible to put so many hours/days/weeks/years of audio into your phone that it would not be able to index the contents.  I have not seen AAC/M4A make such an achievement.

Re: GXLame - Low-bitrate MP3 encoder.

Reply #82
The inbuilt old-style resampler is harmful; so it needs replaced with a more modern albeit slower PPHSultra/fast-fourier type. 
And then,
Default to -V30. . . and then achieve expectations like so:
Automatic shift to 32000bitdepth at -V28
Automatic shift to 24000bitdepth at -V16
Automatic shift to 22050bitdepth at -V8
Automatic shift to 16000bitdepth at -V4
Automatic shift to 16000bitdepth Mono at -V0

This would work for quality smaller files if there was an especially high quality resampler included, inside the codec.  Is that possible? 

Currently, it is possible to supplant the bad/outmode internal resampler by pre-processing with an external high quality resampler. What can be done to better-automate that? 

 
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