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IRIX Installation Tools & Overlays 2001 May
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SGI IRIX Installation Tools & Overlays 2001 May - Disc 3.iso
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relnotes
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dmedia_eoe
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ch27.z
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ch27
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2001-04-16
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27. _S_o_u_n_d__T_r_a_c_k__A_u_d_i_o__T_o_o_l
_S_o_u_n_d_T_r_a_c_k (invoked as _s_o_u_n_d_t_r_a_c_k) is a graphical
application for recording and assembling multi-channel audio
projects. SoundTrack supports non-destructive editing and
processing with multiple levels of undo/redo for up to 32
tracks of audio. The program can also import and export a
wide variety of soundfile and sample formats. Cut-Copy-
Paste functions allow easy transfer of data to and from
other digital media applications such as Movie Maker.
While running SoundTrack, the help menu provides access to
detailed information about creating and editing audio
projects. Also, please see the manual page (soundtrack) for
a list of program features and basic techniques.
27.1 _C_h_a_n_g_e_s__a_n_d__A_d_d_i_t_i_o_n_s
+o The selection semantics for importing multi-channel
(e.g. stereo) files has been improved. If no tracks are
selected, SoundTrack adds two new tracks to the end of
the track list. If one track is selected, the first
channel is written to that track then SoundTrack
inserts any additionally required track after the
selected track.
+o Previewed movie information is now saved with along
with the rest of the project information.
+o Users now have the option of importing the audio from a
movie when the movie is opened.
27.2 _K_n_o_w_n__P_r_o_b_l_e_m_s__a_n_d__W_o_r_k_a_r_o_u_n_d_s
This section lists problems in the IRIX 6.5 version of the
software and ways to work around them.
+o The program does not handle running out of disk space
very well at this time. Be sure to set the project
directory ('File | New') to a drive with plenty of
space for recording and processing. To help deal with
space issues, the status line at the top of the main
application window displays both the available disk
space as well as the amount of space taken up by the
current project.
+o If the program is invoked from a directory where the
user does not have write permission, it will attempt to
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reset the working directory to a write-able temporary
file directory. In this case, the user should invoke
'File | New' prior to any recording or editing
operations in order to set the project directory
properly.
+o During recording and editing, SoundTrack creates
temporary files in the current project directory with
the filename prefix "_temp". If SoundTrack is not
exited normally, these temporary files may still exist
in the project directory. You may need to remove these
files manually. Hint: saving the project file
regularly during a session helps to manage errant temp
files as well as prevent the loss of data in the event
your work is interrupted.
+o When playback/recording starts, the audio input port
which reads the record signal is synchronized with the
output port which is playing back the other tracks.
After this initial sync-up, no additional sync
alignment is performed. In general this will not be a
problem; however, if there are drop-outs in either of
the audio port streams, they will no longer be
synchronized. This situation occurs when other system
processes interfere with the audio thread's access to
the cpu. In the future, we anticipate implementing
periodic sync correction beyond just the initial
startup.
+o This revision of the program does not handle automatic
monitor operations such as muting a track while it's
being recorded over or passing the input signal through
to the output while recording. To hear the input
signal, select the monitor option in the audio control
panel. Note that if you are recording from a
microphone (not line) input, it's best not to monitor
the signal through a nearby speaker since this can
cause noisy feedback.