Skip to main content ↑ ↓

Notice

Please note that most of the software linked on this forum is likely to be safe to use. If you are unsure, feel free to ask in the relevant topics, or send a private message to an administrator or moderator. To help curb the problems of false positives, or in the event that you do find actual malware, you can contribute through the article linked here.
Topic: Transcoding ... Sort Of? (Read 3188 times) previous topic - next topic
0 Members and 1 Guest are viewing this topic.

Transcoding ... Sort Of?

We all know transcoding / re-encoding is bad. What happens when you edit an MP3? Suppose you have Cool Edit (substitute your favourite editor). You can open and edit an MP3 directly, and it saves using an FhG codec. What if the source file wasn't created with FhG, but with Lame or something else? Or the original was 'stereo' but the editor saves it as joint stereo?

I'm wondering if there's any theoretical problem with going from one encoder to another, even if you retain the same bitrate and such. Aren't you re-encoding, in a sense?

No, I haven't tried a blind taste test. Yes, I suppose I could. I'm thinking more thoretical than actual. Any thoughts?

Transcoding ... Sort Of?

Reply #1 –
Saving your edits in mp3 (whatever) and re-editing them, possibly many times is a very-bad-bad-thing, as at every new save you'll have a transcoded version of the previous one. Use straight PCM WAV or a lossles format, WavPack being probably the very best choice for CoolEdit/Adobe Audition, to save the files you're working on.

Sergio
Sergio
M-Audio Delta AP + Revox B150 + (JBL 4301B | Sennheiser Amperior | Sennheiser HD598)

Transcoding ... Sort Of?

Reply #2 –
Quote
What happens when you edit an MP3?
there are ways of editing compressed music in a lossless way, but most professional editors don't make use of this.
basicly if you open a MP3-file and edit it somehow, all the changes are memorized and applied at the the end when you save these changes. this process involves transcoding, as it is decoded and again saved to e.g. MP3.
Quote
You can open and edit an MP3 directly, and it saves using an FhG codec.
=transcoding
Quote
What if the source file wasn't created with FhG, but with Lame or something else? Or the original was 'stereo' but the editor saves it as joint stereo?
yeah, what? what is your question?
Quote
I'm wondering if there's any theoretical problem with going from one encoder to another, even if you retain the same bitrate and such. Aren't you re-encoding, in a sense?
yes. not only in a sense but simply yes.

you may want to do some basic reading on this 

[span style='font-size:8pt;line-height:100%']edit: spelling[/span]
Nothing but a Heartache - Since I found my Baby ;)

Transcoding ... Sort Of?

Reply #3 –
My question is, if you are saving a Lame file with an FhG codec (in this case), isn't that transcoding? So, maybe trying to edit MP3 files is a lost cause, if you're just re-encoding an encoded file? Or is there some process that I don't know that overcomes the problem?

Transcoding ... Sort Of?

Reply #5 –
Quote
My question is, if you are saving a Lame file with an FhG codec (in this case), isn't that transcoding? [a href="index.php?act=findpost&pid=267842"][{POST_SNAPBACK}][/a]
Even if you went from Lame to Lame, FhG to FhG or [encoder of choice] to [encoder of choice], it would still be transcoding.
Encoder, bitrate, preset and such, doesn't change the fact that it's transcoding.

So, do as others have told you. Either avoid it, save to lossless or use the tools dev0 linked to.

Edit: Now that you're aware of the quality reduction, you can of course also choose to live with it.