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1
General - (fb2k) / Re: Composer Metadata
Last post by Porcus -
Column in the view?

I assume you have tried Right-click -> Columns. Then choose "More" (nearly at the bottom). (Alternatively: Preferences -> Display -> Default User Interface -> Playlist View. Assuming you use the Default UI.

From there, you can customize columns. "Add New". Name: "Composer" or what you prefer. Pattern: %composer%
2
General Audio / Re: Clipping audible when lossy encoding?
Last post by Porcus -
Applying the gain losslessly: one could hack together a search query that first selects those for which the peak is positive but not (in dB terms) larger than the RG (album peak and album gain, I would presume for the purpose) - and apply to those first, and then have a more careful look at the others. I don't think fb2k has logarithm or exponentiation in its query syntax though, so here is a chance to hone your Taylor expansion skills ...

But the topic leads me to a couple of questions ... it would be interesting to know whether there is anything that happens up there. A lossy representation need not stay below 0 dB in all samples even if the original does.
 - As long as there are only "a few samples every now and then" peaking over 0 dB, and that is nothing but part of the "loss" in "lossy": is there anything that says that clipping those makes it any worse?
 - Then: is there any reason to believe that +2.6 dB peaks are but an artifact of the lossiness, or would that be so large that you would think there must have been a volume bump in the process?
3
General Audio / Re: Clipping audible when lossy encoding?
Last post by DVDdoug -
...I've never used Opus.

If it's going over 0dB the file itself isn't clipped at 0dB.  However you'll clip your DAC if you play it at "full digital volume".

I've never heard of a case where the clipping caused by lossy encoding was audible.   That is, I've never heard of a case where lowering the volume (before encoding) made audible compression artifacts go-away, or of a case where lowering the volume improved the sound.  (Nor, have I ever heard of anyone doing these experiments.)

Quote
What can I do to prevent clipping?
You can use a 2-pass process...  Encode once to find the peak...  Lower the level by the required amount and encode again.   Or, take bennetng's suggestion and use ReplayGain (and make sure it's set-up to avoid clipping).
4
Audio Hardware / Re: Laptop usb soundcard suggestions
Last post by antz -
Just thought I'd update this thread - the UCA 202A has arrived! It does "just work", no drivers or fiddling, just change the settings as appropriate. Yes, the headphone output isn't the greatest but as a monitor facility it isn't terrible. I'll probably look into modifying that at some point. For the cost I'm not disappointed.
5
Just my two cents , @Arrivest , but there is a truckload of posts spread out throughout the years in this community, that could tell you why transcoding from lossy to lossy isn't that great an idea - from both the qualitative and commonsensical POVs.

This is for use in his car, and he is keeping the original files, so not so much of an issue. If anything he should be pointed to a vbr setting.
6
Just my two cents , @Arrivest , but there is a truckload of posts spread out throughout the years in this community, that could tell you why transcoding from lossy to lossy isn't that great an idea - from both the qualitative and commonsensical POVs.
7
General Audio / Re: Clipping audible when lossy encoding?
Last post by bennetng -
1.35 = +2.6dB so -1.5dB is not enough anyway.
Audibility may vary from track to track, need to ABX.
Safetest way to avoid clipping for all formats is to use a playback app with proper RG support.
9
Validated News / Re: Rockbox 3.14 released
Last post by includemeout -
As I cannot recall doing that back then, I'll give it a try.

As ever, thanks for the help, @saratoga !
10
General Audio / Clipping audible when lossy encoding?
Last post by halb27 -
I ran upon this question when testing opus last night. But it's not a specific opus question.

I encoded my standard test set of various pop tracks in order to find out average bitrate for a certain opus bitrate setting.
But I also looked at the peak track values. They were often something like 1.35.
Thanks to the loudness war most of my original flac tracks have a peak of 1.0 or not much below.
With this basis it is clear that such things happen going from the time domain to the frequency domain and back.
But what does this mean for the final quality? With peak values ~1.35 can I be sure clipping is inaudible or avoided somehow?
With mp3 I always look at the track peak value given by foobar, and - if necessary - edit a track gain value of -1.5 db (or more if necessary) and apply track Replaygain to the file content. After that I expect listening with foobar can't have clipping issues any more. With other decoders things can be different, but I expect to have significnatly lowered the chance for audible clipping also in these cases.

I do the same with AAC files. But what about codecs like opus? What can I do to prevent clipping? Or are these worries irrelevant? I'm pretty much beyond certainties at the moment.