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Topic: MP3 320 to V2 (Read 2232 times) previous topic - next topic
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MP3 320 to V2

I see that MP3 V2 is enought quality for me.
I have a big MP3 collection at 320Kbps.
In order to save space (is getting too big to fit in my mobile), it would be reasonable to recompress it to V0 or any lossless to lossless is a crime?

Re: MP3 320 to V2

Reply #1 –
Well, lossy to lossy is a crime, having a collection based on lossy files is a crime... sure you can do everything you want, and 320 isn't bad. I'd say if you re-encode to a modern and widely compatible format like Apple LC AAC, you will likely a) not hear any diffrerence at all and b) save 50% of space. I wouldn't recommend encoding to mp3 again, the format is just much less effective. Similar quality with Opus. It will probably be compatible with your smartphone, just much less on audio hardware.
Opus will be easier to install for you, Apple LC AAC, you'd start to read the docs at QAAC on Github. Installation is not too easy, but you only need to manage it once.

Re: MP3 320 to V2

Reply #2 –
Keep your 320s.

Elsewhere than your phone. You do anyway need to have a back-up (yes you do!), and storage is cheap even if phone storage isn't necessarily so.

Then you can create a mobile set with much lower bitrate. Opus, AAC or Lame at "V6" ...
If for any reason that doesn't sound good - too low bitrate, or possibly that the transcoding kills gaplessness - then throw those away and encode those files using something else (or if they are a PITA, maybe they are encoded using some weird tool ... just copy over, you will have space for a few 320's).

(It is also possible to use MP3packer to try to re-do "the part after the lossiness". It is lossless, but "only on healthy files": it is less graceful on files with broken frames, junk headers or whatever, and especially gaplessness will suffer when the orignal MP3 file wasn't done right. And, from experience "only old 320 CBR are wasteful enough" for it to make much sense.)

Re: MP3 320 to V2

Reply #3 –
OK, I think the best way to go is mantain my MP3@320 and use FLAC for new additions.

Now I have a new question, which parameters to use for FLAC to get similar quality of MP3 V2?

Re: MP3 320 to V2

Reply #4 –
FLAC is lossless (as PCM). This also means you don't have any control over the bitrate (not counting that you get by controlling the sample rate, bit depth, and channel count) and I see the average as about 1Mbps for CDDA but this depends on content.

Re: MP3 320 to V2

Reply #5 –
Quote from: Klymins on
FLAC is lossless (as PCM). This also means you don't have any control over the bitrate (not counting that you get by controlling the sample rate, bit depth, and channel count) and I see the average as about 1Mbps for CDDA but this depends on content.

Sorry, I meant to say OPUS

Re: MP3 320 to V2

Reply #6 –
So it makes:
Quote
which parameters to use for Opus to get similar quality of MP3 V2?

This highly depends on the content (even chaotically) but I expect that point to be between 96kbps and 128kbps for most audio based on listening tests I've seen. I'd recommend 128kbps considering Opus' artifacts can be more annoying than MP3's'.

Re: MP3 320 to V2

Reply #8 –
once lossy we no touchy
this forces us to choose the lowest bitrate possible to really drive home the ONLY advantage lossy has.
... which is why we stay with lossless :D
And so, with digital, computer was put into place, and all the IT that came with it.

Re: MP3 320 to V2

Reply #11 –
I'll be the third to mention to really drive it home, use MP3 Packer to get back some space LOSELESSLY. When you want to put music on your phone then use codec of choice (I prefer OPUS) to compress down to a size that meets your needs.

Re: MP3 320 to V2

Reply #12 –
Quote from: DrivingVertigo on
I'll be the third to mention to really drive it home, use MP3 Packer to get back some space LOSELESSLY.
fb2k also has such options (rewrite mp3 stream, optimize layout etc.) plsu there's foo_cover_utils which can batch resize embedded art. Should be done before rewriting the mp3 ofc.

Re: MP3 320 to V2

Reply #13 –
I don't think fb2k has anything of what MP3packer's "-z" switch does? The one that recompresses the Huffman encoded part of it.