cdda frames correction

[ledestin]

is there a way to retroactively (batch) correct the frame boundaries of (already) splitted wave-tracks to be cdda conform (75fps) within audacity?

[DVDdoug]

I don't know, but what are you trying to do? Maybe you shouldn't split the file? Or, maybe you should re-join the files?

At the bottom of the Audacity window, you can change the time settings to display frames.

Your CD burning software will probably pad the file, making a full-frame at the end. (So there's probably no need to do it in Audacity.)

...The only time I've given frames a 2nd thought is when making a cue sheet for a continuous/live recording. And in that case, I "manually" converted milliseconds (or 10ths of a second) for each track marker to frames.

[ledestin]

thank you for taking time to answer.

well, of course i could join and resplit them, but isnt there a more elegant way to quickly make the already splitted waves cdda frame conform?

[steve]

of course i could join and resplit them

That's how I would do it if I needed to.

[Gale Andrews]

isnt there a more elegant way to quickly make the already splitted waves cdda frame conform?

In case you need to do this and you needed more information, Doug meant that you have to click the dropdown arrow to right of the digits in Selection Toolbar, and choose "CDDA Frames (75 fps)". Then further to left in Selection Toolbar, choose one of the "Snap To:" options (if you are using an older Audacity version, Snap To is a checkbox). Then clicking or making a selection will snap to a CDDA frame.

As Doug said, this isn't usually necessary, and it's more awkward to do it with an existing file.


Gale

[ledestin]

of course i could join and resplit them

That's how I would do it if I needed to.

hm, that is very time consuming. i hoped, there is a quicker (batch) solution to it (not necessarily with the help of audacity)...


just for better understanding:

if i leave the splitted files as they are and burn them with padding activated, will the result be identical to post corrected tracks (with audacity)?

if so, the benefit of 'correcting' them is not given, as the cd will never be gapless for real, is it?

and therefore, rejoin + split is the only way?

[Gale Andrews]

If you have a continuous performance that must play continuously as the CD moves from one track to the next, the CD drive you are burning with must support Disc-at-once (DAO) as a first prerequisite. See Gapless burning.

If the CD burner pads silence to end at a frame then the result won't be identical to using Audacity to set boundaries to CDDA frames, but the padding does not matter if it is not a continuous performance.

Audacity has no batch command to trim or expand to frame boundaries. You could double-click an existing WAV file with Snap To on then SHIFT-click at the end of the track might trim or expand, depending on the version of Audacity (you have not told us your version - see the pink panel at the top of the page). So you may need to zoom in and see exactly what is happening with each file. That's why it is probably better to join and re-split with Snap To on, marking the track splits with a point label, then Export Multiple.


Gale

of course i could join and resplit them

That's how I would do it if I needed to.

hm, that is very time consuming. i hoped, there is a quicker (batch) solution to it (not necessarily with the help of audacity)...


just for better understanding:

if i leave the splitted files as they are and burn them with padding activated, will the result be identical to post corrected tracks (with audacity)?

if so, the benefit of 'correcting' them is not given, as the cd will never be gapless for real, is it?

and therefore, rejoin + split is the only way?

[steve]

If your reason for splitting on frame boundaries is to achieve gapless playback from CD, then you probably don't need to do that. Most modern CD burning software can produce gapless audio CDs without the user having to worry about frame boundaries (subject to the drive supporting DAO).

[ledestin]

If you have a continuous performance that must play continuously as the CD moves from one track to the next, the CD drive you are burning with must support Disc-at-once (DAO) as a first prerequisite. See Gapless burning.

no problem, my drive supports dao (nopad) - it is a continuous performance, so gapless burning is needed.


just to recap, if i correctly understood (for future editing as well as correcting existing tracks (audacity 2.1.2):

+ choose one of the 2 CDDA Frames (75 fps) options and turn on snap to (next) in selection toolbar

+ editing (manual mark/cut/export or marking for multiple export) is now cdda conform


in case you want to correct an existing track, just import it and then doubleclick the wav in the main window?

[DVDdoug]

it is a continuous performance, so gapless burning is needed.

If you have the original non-split file you can use a cue sheet to set the track markers, as long as your burning application supports cue sheets (I use ImgBurn).