For audio/video, is the iMac enough? Or is MacPro the way to go?

I do most of my work in ProTools as a recording artist, but am starting to do video editing, specifically concerts with multiple HD cameras set up. I will always be mainly working on the audio side, but I'd like to become proficient in video editing as well since it would help out in the studios I work with for various projects. I'm not going to be making massive movies or anything, but i will be sifting through various camera angles of concerts to make promotional videos and the like.
Is a new iMac the way to go, or MacPro?
I'm leaning towards the iMac on account of price, though I'd likely top it up with all the bells and whistles... so it'll be likely close to the base price of the MacPros if not more. Also, they'll be coming out with another iMac soon I hear, though nobody knows when. So I'm ready to wait for the latest iMac. Should I?
Thanks!

I'm not that big on tweaking my computer so much... i only recently upgraded the RAM on my 2006 MacBookPro! So while I can appreciate the value of customizing my computer, I doubt I'll be fiddling with it too much.
I suppose my question is, can the iMac do the job? And are it's shortcomings such that I'd be foolish not to spend the extra couple thousand bucks and get a MacPro? Is it worth the extra dough, for someone who won't be regularly upgrading this and that? And should I wait for the supposedly upcoming new iMac?
Sorry, I should have said questions up there.

Similar Messages

Is there a way to CAPTURE audio/video off the net then run it m.m. prsntn

I'm fairly new to the mac genre. In windows we had apps like Camtasia to
capture audio/video off the net. I was hoping something like that would
be avail for the mac and then once capture it how would I edit it and
include it in a presentation software; for example, keynote?
Is there added hardware req'd (?Capture board)? what would be a good software mac
compatible?

I'd like to capture audio and video for example sometimes just need to capture the
audio if some instruction is coming say over a quicktime or media player for my work.
Then sometimes I need to capture the audio and video when they ware actually showing me
charts and explaining them things like that.
is snap Z the way to go then for quality and fair pricing to get good results.
Do we have any resident applications already on the ilife variety that could be utilized for
something like this or is the only way to go through a 3rd party vendor?

Streaming audio-video on the mobile device

Please, I must do the streaming audio-video on the mobile device using a server standard.
I must to program the application for the server using j2se:in this case how i can send the file audio/video?This file have specifies classes?
For the client i must using the j2me:in this case how can receive the file audio and creating the player?
Thanks.

Hi, please help,
I have problem in this area also,
am intending to stream audio and video data to mobile phone using j2me for my bs project.,
is that true, midlets can only 'plays back' one file at time specified by url?
I want to store many files in database( e.g ms access), and call them to midlets, to make some how interactive and real,because i have tomcat server installed in my pc.
is this possible?
How can i call file stored beyond path of WTK ?
can i store audio/ video file in ms- access?
Please, please help !
thanks in advance.
Message was edited by:
nbkamani

How can I connect my '07 MBP to an HDTV via HDMI for audio/video?

How can I connect my '07 MBP to an HDTV via HDMI for audio/video?

About Mini DisplayPort to HDMI adapters
Stefan

How can i change the setting for audio-video for my face time to built in only so i can have my skype camera ?

Good evening,
The last few days my I lost the ability on Skype to be seen by the other party ... I can see them but they cannot see me. At the same time my Face Time sent me some messages error.
When I open my Skype and go to Preference and go to audio/video I see my image ... and when I go back to make a call the camera is off (no light). When I look at the bottom where I can have a drop down arrow I have Face Time (built in).
On my other Macpro (that work well) I have at the same place built-in only.
Cannot change anything on my MacBook air ... no drop in.
Please Help and thank you !

There are no settings for video resolution or frame rate.
Regarding iOS developer policies:
https://developer.apple.com/devcenter/ios/index.action

How can I display & split the audio & video from the same digitized clip?

I digitized a scene into iMovie that I edited on a professional system which I don't have access to anymore. The whole scene is 1 clip. Now I see a few tweaks that I want to make, so I was hoping to do them in iMovie.
I want to "pull up" the audio in one section - meaning I want to take cut about 20 frames of audio from the end of a shot, and then move all the other audio up to fill the hole. To compensate for the missing 20 frames, I'll cut video off the head of the next shot. Some call this prelapping. Some call it an L-cut. Some call it asymmetrical trimming. Either way, I can't figure out how to do it in iMovie.
My clip appears in the timeline as one track - a single track that contains the video and 2 audio tracks. How can I display the audio that's tied to the video on its own track? Then I think I could split audio & video wherever I wanted and trim things up - but I can't figure out how to do it.
Am I asking too much of this software?
BTW, I never see the option to "Split audio clip at playhead". I'm not displaying clip volume or waveforms. Choosing to display waveforms doesn't show me anything. Maybe iMovie thinks I'd only want to see waveforms of audio that isn't tied to my video-and-audio clips?
Thanks in advance for any help...

Jordon,
"Am I asking too much of this software?"
No, you're not.
You first want to select your clip(s) and choose Advanced>Extract Audio.
This will copy the audio from the video clip and place it on one of the two separate audio tracks while lowering the audio level to zero in the original video track.
You can now edit and move the audio independently of the video.
With the audio clip selected, you'll find you now have access to Edit>Split Selected Audio Clip at Playhead.
Matt

Software for playing videos from the Web

Hi all,
As a regular vistor of all sports websites especially, as well as your funnyvideoclips site etc, I am horrified that my N95 won't play any videos. Why can't the video player used for watching movies I've actually taken be used. Even on BBC's site I cannot view interviews or actual sports footage.
I'd be grateful to know what my options are and in the most basic of terms as I'm not technically proficient - or good at spelling.

Open the Video Center, and go select the optional Internet feeds. More and more are being added from time to time.
Reuters
YouTube mobile http://m.youtube.com (just use this address in your browser)
SonyPictures
FreeBee TV
Google Video (download the ipod or PSP version of the video it should play correctly)
Also use Podcasting application to subscribe to Video Podcasts.
Some websites that stream in RealPlayer mode can be watched with N95. But if they stream Flash (FLV) or WMV then it's a no go.
Hope this helps.
640K Should be enough for everybody
El_Loco Nokia Video Blog

Which is better for AUDIO: HDMI or the Digital Optical Fiber Optic Toslink Audio Cable?

Is there a difference in Audio performance between your standard HDMI hook up (for my Blue Ray Player) or adding the Digital Optical Fiber Optic Toslink Audio Cable. Which will sound better????
Please help...
Thank you for your time!!!

Well that is huge debate here. My opinion is HDMI cables are WAY over priced for what they are. Do not be lead to believe you have to have a 100 dollar hdmi cable, I think 50 is crazy high myself. My only concern is getting one so cheap that it might have poor connections or not last. Also if you run it in a wall it has to be rated for that.
I have a Rocketfish cable and it works fine. My guess would be the dynex cables are fine too. And if your not buying it from Best Buy there are other options as well.
Something else to keep in mind as well. If you only have one HDMI device and you hook it up to your reciever using HDMI you will need two cables for one device. The one that runs to the Reciever and then the one from the reciever to the tv. If you use an Optical cable you only need the one HDMI cable. Run the HDMI cable from the blu ray to the tv, and the optical line from the player to the reciever. This will give you 5.1 dolby or dts through the reciever and also sound through the tv since HDMI carries sound as well as video.
But if money (for cables) was not an issue the HDMI cable supposedly can offer the best sound quality of the two.

Need help with 4-5 camera set up for audio/video podcast

Hey guys. I'm overseeing the podcast/audiobook studio construction for my company's new entertainment venture. It will ultimately be my job to produce the podcasts and audiobooks. The catch is that they also want to film the podcasts as well. I'm trying to find the most affordable set up that makes the editing/conversion process easiest for me on FCPX.
As you'll see I'm a bit all over the place. The essentials for what I'm looking for is
1) The right Camcorder
2) The most efficient way to record, edit and sync audio
What is the most affordable camcorder to use that works really well with FCPX? I've been hearing rumors that some aren't compatable and require a tedious conversion process. The Kodak Zi8 seems perfect because it shoots in 1080p and has a mic input, but I'm not sure if it works well with FCPX. Now, I don't know if the mic input is necessary. I was thinking the easiest way to automatically sync audio is by plugging the 4 mics into the camera's mic input and record that way. That should sync everything up automatically right? I also watched a tutorial on the multicam editing option in Final Cut and that seems perfect for this project. Do I need a mic input if I use this method? It seems like the syncing is super easy with the built in camera audio and the podcast audio files together.
I also would like to be able to record directly into the computer but don't know if that's possible. The process of taking 4-5 SD cards and uploading it after each shoot that way seems super tedious. I'm not sure if there is way to do that.
Another option would be for us to buy a video switcher but all the options seem so expensive. Anybody know of good hardware that'd work? That way I could edit on the go and if we want to make this a live ustream we can do so. I was also thinking about switcher software and using MIDI. Not sure if that is possible either.

Lets ignore whether you should be doing this, but, if they are requesting that you do it, have at it.
Although, the simplicity of this is mind boggling, for them not to do it...ah well, you're donating for a non profit, they are probably the cheapest game in town, and lost the sole employee who could scratch their backside...
Choice one, I dont recommend this one - File > Print booklet, 2 up saddle stitch. Flip back and forth using the Print Settings button at the bottom to orient the page layout and set paper size. Set the printer as Adobe PDF. Keep checking the Preview in the main Print Booklet dialog, I had to set a page range of 39 pages in a 40 page book for this to work last week.
Choice two - If you have set a 44 page document with bleeds, export to pdf, toggle "Use ducument bleeds", no crops. Place those reulting pdf's in a new 11 x 17, landscape doc, with appropriate bleeds. How you defined the bleeds in the 44 page document dictates how much fiddling you will have to do at the center (fold line) of the new 11 x 17 "imposed" document. (If your 44 page was not set as facing pages, you might have defind inside bleed to zero. If it was not set as a facing pages document, it references top, bottom, left and right bleeds) (The use of pdf for this is not necessary, you could just as easily place pages from the original InDesign file as pdf's) Setting a blue line/guide line at the center would help to crop in bleeding frames.
All above seems too simple, you are only needing to impose pages 22-23 for these steps btw.
@Scott Falkner - I knew I was being to wordy.

Trying to decide on best configuration for photo/video on 27" iMac.

I want to get the new 27" iMac. I plan to use it for photography as well as some light video editing.
I decided on the 1TB fusion drive.
But what I want to know is what is the main reason for the $200 price diff btwn the base 2.9ghz 27" iMac ($1,799) and the base 3.2ghz 27" iMac($1,999)??
Besides the slight diff in ghz(they are both 3.6ghz with turbo boost by the way)...I only notice that the $1,999 iMac has a faster GPU with 1gig of VRAM as opposed to 512mb.
They are both i5 and identical in every other regard. Is the GPU worth the extra $200 for what I am doing?
What would be more beneficial for photo & video editing? Bumping up to an i7 for $180 more? Or bumping the GPU to the 680mx with 2gigs of VRAM for $135 more?
Thanks!
Can't wait to order mine. :-)

what is the main reason for the $200 price diff btwn the base 2.9ghz 27" iMac ($1,799) and the base 3.2ghz 27" iMac($1,999)??
The differences are 1) the slightly faster CPU, 2) a slightly upgraded GPU with increased VRAM and 3) the ability to upgrade to an i7 processor at the time you place your order.
imho you will be better off investing the $200 price difference in more RAM and/or the Fusion Drive before worrying about the slight speed difference between a 2.9GHz and a 3.2GHZ i5 processor.
RAM and disk drive access times have a significant effect on overall system performance. Photo and video editing performance will be greatly influenced by the amount of RAM available and disk drive access speed ... far more than a mere 0.3GHz difference in cpu processor speed.
The price difference is even bigger ($400) if you are comparing a 2.9GHz i5 to the 3.4GHz i7 versions.

Codes for audio video receiver class

I am currently writting an audio and video receiver for my project based on AVReceive3, it works but i can only get Video only, everything seems to be normal, i dont see why i am not getting audio. My transmitter is working fine and sending both streams.
If anyone can spot the error or mistake i a making, pleaase let me know as soon as possible.
my email address is [email protected]
public class AudVidReceive extends Frame implements ActionListener,ReceiveStreamListener,SessionListener,ControllerListener
// Input MediaLocator
// Can be a file or http or capture source
private MediaLocator alocator;
MediaLocator vlocator,vloct,aloct;
private String ipAddress;
private int portBase;
Button transtop,transtart,recstop,recstart;
Component controlPanel, visualComponent;
//For Receiving Media Stream
String sessions[] = null;
SessionManager mgrs[] = null;
Vector playerWindows = null;
boolean dataReceived = false;
Object dataSync = new Object();
private Processor processor = null;
Player player=null;
Format fmt=null;
private SessionManager rtpMgrs[];
private DataSource dataOutput = null;
DataSource ads=null;
DataSource vds=null;
DataSource source[];
DataSource m=null;
public AudVidReceive()
super("Audio Video Receive");
recstart=new Button("StartReceiving");
//recstop=new Button("Stop Receiving");
add(recstart);
recstart.setBounds(80,250,100,30);
recstart.addActionListener(this);
setLayout(null);
setSize(400,300);
setVisible(true);
//this.sessions=sessions;
public void actionPerformed(ActionEvent e)
Button b=(Button)e.getSource();
String ac=e.getActionCommand();
if(ac.equalsIgnoreCase("StartReceiving"))
boolean flag;
boolean st=initialize();
if(!st)
System.err.println("Failed to Realize the Sessions ");
System.exit(-1);
flag=isDone();
try{
while(!flag)
Thread.sleep(1000);
}catch(Exception e1)
e1.printStackTrace();
//Initialize the Session for Receiving the Incomming Stream
protected boolean initialize() {
try {
InetAddress ipAddr;
SessionAddress localAddr = new SessionAddress();
SessionAddress destAddr;
String sessions[]={"192.168.2.143/42060"};
mgrs = new com.sun.media.rtp.RTPSessionMgr[sessions.length];
playerWindows = new Vector();
SessionLabel session;
// Open the RTP sessions.
for (int i = 0; i < sessions.length; i++) {
// Parse the session addresses.
try {
session = new SessionLabel(sessions);
} catch (IllegalArgumentException e) {
System.err.println("Failed to parse the session address given: " + sessions[i]);
return false;
System.err.println(" - Open RTP session for: addr: " + session.addr + " port: " + session.port + " ttl: " + session.ttl);
mgrs[i] = new com.sun.media.rtp.RTPSessionMgr();
mgrs[i].addSessionListener(this);
mgrs[i].addReceiveStreamListener(this);
ipAddr = InetAddress.getByName(session.addr);
destAddr = new SessionAddress(ipAddr, session.port,
ipAddr, session.port+1);
mgrs[i].initSession(localAddr, getSDES(mgrs[i]), .05, .25);
// You can try out some other buffer size to see
// if you can get better smoothness.
BufferControl bc = (BufferControl)mgrs[i].getControl("javax.media.control.BufferControl");
if (bc != null)
bc.setBufferLength(350);
mgrs[i].startSession(destAddr, session.ttl, null);
} catch (Exception e){
System.err.println("Cannot create the RTP Session: " + e.getMessage());
return false;
// Wait for data to arrive before moving on.
long then = System.currentTimeMillis();
long waitingPeriod = 120000; // wait for a maximum of 30 secs.
try{
synchronized (dataSync)
while (!dataReceived && System.currentTimeMillis() - then < waitingPeriod) {
if (!dataReceived)
System.err.println(" - Waiting for RTP data to arrive...");
dataSync.wait(1000);
}catch (Exception e) {}
if (!dataReceived) {
System.err.println("No RTP data was received.");
close();
return false;
return true;
* Find out the host info.
String cname = null;
private SourceDescription[] getSDES(SessionManager mgr)
SourceDescription[] desclist = new SourceDescription[3];
if (cname == null)
cname = mgr.generateCNAME();
desclist[0] = new
SourceDescription(SourceDescription.SOURCE_DESC_NAME,
System.getProperty("user.name"),
1,
false);
desclist[1] = new
SourceDescription(SourceDescription.SOURCE_DESC_CNAME,
cname,
1,
false);
desclist[2] = new
SourceDescription(SourceDescription.SOURCE_DESC_TOOL,
"AVReceive powered by JMF",
1,
false);
return desclist;
//Check Player window sizing
public boolean isDone() {
return playerWindows.size() == 0;
* Close the players and the session managers.
protected void close()
for (int i = 0; i < playerWindows.size(); i++)
try {
((PlayerWindow)playerWindows.elementAt(i)).close();
} catch (Exception e) {}
playerWindows.removeAllElements();
// close the RTP session.
for (int i = 0; i < mgrs.length; i++) {
if (mgrs[i] != null) {
mgrs[i].closeSession("Closing session from AudVidReceive");
mgrs[i] = null;
//Find the player
PlayerWindow find(Player p) {
for (int i = 0; i < playerWindows.size(); i++) {
PlayerWindow pw = (PlayerWindow)playerWindows.elementAt(i);
if (pw.player == p)
return pw;
return null;
//Find whether the Player is receiving the Stream
PlayerWindow find(ReceiveStream strm) {
for (int i = 0; i < playerWindows.size(); i++) {
PlayerWindow pw = (PlayerWindow)playerWindows.elementAt(i);
if (pw.stream == strm)
return pw;
return null;
* SessionListener.
public synchronized void update(SessionEvent evt) {
if (evt instanceof NewParticipantEvent) {
Participant p = ((NewParticipantEvent)evt).getParticipant();
System.err.println(" - A new participant had just joined: " + p.getCNAME());
* ReceiveStreamListener
public synchronized void update( ReceiveStreamEvent evt) {
SessionManager mgr = (SessionManager)evt.getSource();
Participant participant = evt.getParticipant(); // could be null.
ReceiveStream stream = evt.getReceiveStream(); // could be null.
if (evt instanceof RemotePayloadChangeEvent) {
System.err.println(" - Received an RTP PayloadChangeEvent.");
System.err.println("Sorry, cannot handle payload change.");
System.exit(0);
else if (evt instanceof NewReceiveStreamEvent) {
try {
stream = ((NewReceiveStreamEvent)evt).getReceiveStream();
DataSource ds = stream.getDataSource();
// Find out the formats.
RTPControl ctl = (RTPControl)ds.getControl("javax.media.rtp.RTPControl");
if (ctl != null){
System.err.println(" - Recevied new RTP stream: " + ctl.getFormat());
} else
System.err.println(" - Recevied new RTP stream");
if (participant == null)
System.err.println(" The sender of this stream had yet to be identified.");
else {
System.err.println(" The stream comes from: " + participant.getCNAME());
// create a player by passing datasource to the Media Manager
Player p = javax.media.Manager.createPlayer(ds);
if (p == null)
return;
p.addControllerListener(this);
p.realize();
PlayerWindow pw = new PlayerWindow(p, stream);
playerWindows.addElement(pw);
// Notify intialize() that a new stream had arrived.
synchronized (dataSync) {
dataReceived = true;
dataSync.notifyAll();
} catch (Exception e) {
System.err.println("NewReceiveStreamEvent exception " + e.getMessage());
return;
}//above catch closing if
else if (evt instanceof StreamMappedEvent) {
if (stream != null && stream.getDataSource() != null) {
DataSource ds = stream.getDataSource();
// Find out the formats.
RTPControl ctl = (RTPControl)ds.getControl("javax.media.rtp.RTPControl");
System.err.println(" - The previously unidentified stream ");
if (ctl != null)
System.err.println(" " + ctl.getFormat());
System.err.println(" had now been identified as sent by: " + participant.getCNAME());
else if (evt instanceof ByeEvent) {
System.err.println(" - Got \"bye\" from: " + participant.getCNAME());
PlayerWindow pw = find(stream);
if (pw != null) {
pw.close();
playerWindows.removeElement(pw);
}// end of this method
* ControllerListener for the Players.
public synchronized void controllerUpdate(ControllerEvent ce) {
Player p = (Player)ce.getSourceController();
if (p == null)
return;
// Get this when the internal players are realized.
if (ce instanceof RealizeCompleteEvent) {
PlayerWindow pw = find(p);
if (pw == null) {
// Some strange happened.
System.err.println("Internal error!");
System.exit(-1);
pw.initialize();
pw.setVisible(true);
p.start();
if (ce instanceof ControllerErrorEvent) {
p.removeControllerListener(this);
PlayerWindow pw = find(p);
if (pw != null) {
pw.close();
playerWindows.removeElement(pw);
System.err.println("AVReceive internal error: " + ce);
* A utility class to parse the session addresses.
class SessionLabel {
public String addr = null;
public int port;
public int ttl = 1;
SessionLabel(String session) throws IllegalArgumentException {
int off;
String portStr = null, ttlStr = null;
if (session != null && session.length() > 0) {
while (session.length() > 1 && session.charAt(0) == '/')
session = session.substring(1);
// Now see if there's a addr specified.
off = session.indexOf('/');
if (off == -1) {
if (!session.equals(""))
addr = session;
} else {
addr = session.substring(0, off);
session = session.substring(off + 1);
// Now see if there's a port specified
off = session.indexOf('/');
if (off == -1) {
if (!session.equals(""))
portStr = session;
} else {
portStr = session.substring(0, off);
session = session.substring(off + 1);
// Now see if there's a ttl specified
off = session.indexOf('/');
if (off == -1) {
if (!session.equals(""))
ttlStr = session;
} else {
ttlStr = session.substring(0, off);
if (addr == null)
throw new IllegalArgumentException();
if (portStr != null) {
try {
Integer integer = Integer.valueOf(portStr);
if (integer != null)
port = integer.intValue();
} catch (Throwable t) {
throw new IllegalArgumentException();
} else
throw new IllegalArgumentException();
if (ttlStr != null) {
try {
Integer integer = Integer.valueOf(ttlStr);
if (integer != null)
ttl = integer.intValue();
} catch (Throwable t) {
throw new IllegalArgumentException();
* GUI classes for the Player.
class PlayerWindow extends Frame {
Player player;
ReceiveStream stream;
PlayerWindow(Player p, ReceiveStream strm) {
player = p;
stream = strm;
public void initialize() {
add(new PlayerPanel(player));
public void close() {
player.close();
setVisible(false);
dispose();
public void addNotify() {
super.addNotify();
pack();
* GUI classes for the Player.
class PlayerPanel extends Panel {
Component vc, cc;
PlayerPanel(Player p) {
setLayout(new BorderLayout());
if ((vc = p.getVisualComponent()) != null)
add("Center", vc);
if ((cc = p.getControlPanelComponent()) != null)
add("South", cc);
public Dimension getPreferredSize() {
int w = 0, h = 0;
if (vc != null) {
Dimension size = vc.getPreferredSize();
w = size.width;
h = size.height;
if (cc != null) {
Dimension size = cc.getPreferredSize();
if (w == 0)
w = size.width;
h += size.height;
if (w < 160)
w = 160;
return new Dimension(w, h);
public static void main(String [] args) {
Format fmt = null;
int i = 0;
AudVidReceive at1 = new AudVidReceive();
System.err.println("Start Receiving incoming Streams ");
try {
Thread.currentThread().sleep(60000);
} catch (InterruptedException ie) {
ie.printStackTrace();

I have to use RTP and RTSP for transferring the
audio/video streams in real time.
How I can sen and receive RTP packets.
How can I make the RTP Player.
What is the role of JMF in it.
Please suggest me and provide me the codes if
possible.
Thanks alot
shobhit vermaThere are two ways using which you can send and recieve packets using rtp. One without using the SessionManager and the other with.
1.) Not using the SessionManager makes things easy for you but it offers very little flexibility to you. You can do this by just specifying a medialocator pointing to the specific url
2.) Using the SessionManager is what is usually suggested. This process is more complex. First you have to instantiate a RTPSessionMgr to a SessionManager reference using which you can send and receive streams to and from the network. The process is more involved than this and is suggest you read some tutorials to get a better understanding, than me explaining to you the entire process.
Message was edited by:
qUesT_foR_knOwLeDge

Audio/Video from the net

There is a wonderful 2 minute violin piece that I can play on my computer (w/RealPlayer) complete with the video of the artist (Leila Josefowicz) playing. Can I get the audio (and possibly the video) to my IPod?

Dumb Question

Embedded video in the way of slideshow

Hi!
I've got three slideshows underneath eachother and underneath those three an embedded Youtube vide
When the slideshows oen up in their little window the embedded video is shown above the slideshow itself, obscuring the view.
I've tried moving the video to the back and the slideshow to the front but the problem is still there. The rest of the page fades when the slideshow starts, except for the video.
What can I do to make the video fade behind the slideshow as well, or at least get the slideshow to lay on top of the video, faded or not.
Alternatively, how can I make the slidehsow open up on the top of the page instead of in the middle of the screen depending on ow far I've scrolled down?
Thanks,
Max

Lightbox with any other content should work as expected where slideshow will bring the fade effect for all other contents on page.
Please provide the page link where you see this behavior.
Thanks,
Sanjit

Why can I not watch a video all the way thru without it stopping and starting, & freezing?

I like to go to abc or cbs pbs etc. and watch their videos but they do
not run all the way thru. They stop and start and stop and start and
freeze and start and quit.

If there are problems with updating then best is to download the full version and uninstall the currently installed version.
Download a fresh Firefox copy and save the file to the desktop.
* Firefox 5.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Uninstall your current Firefox version.
* Do not remove personal data when you uninstall the current version.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
* It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
Your bookmarks and other profile data are stored elsewhere in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder] and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
It is possible that there is a problem with the files sessionstore.js and sessionstore.bak in the Firefox Profile Folder.
Delete the files sessionstore.js and sessionstore.bak in the Firefox Profile Folder.
* Help > Troubleshooting Information > Profile Directory: Open Containing Folder
* http://kb.mozillazine.org/Profile_folder_-_Firefox
* http://kb.mozillazine.org/sessionstore.js
If you see files sessionstore-##.js with a number in the left part of the name like sessionstore-1.js then delete those as well.
Deleting sessionstore.js will cause App Tabs and Tab Groups to get lost, so you will have to create them again (make a note).
See:
* http://kb.mozillazine.org/Session_Restore
Some have reported that increasing the session store saving interval worked for them. 
See:
* http://kb.mozillazine.org/browser.sessionstore.interval
To open the about:config page, type about:config in the location (address) bar and press the "Enter" key, just like you type the url of a website to open a website. 
If you see a warning then you can confirm that you want to access that page. 
You can use the Filter bar at to top of the about:config page to locate a pref more easily.

What makes the audio spectrum look the way it does?

The audio spectrum generated preset in CS6 looks different from most audio spectrums. What exactly is it doing to the actual spectrum to make it look the way it does? And is it possible to get something similar to that to render in realtime for use as a visualizer with a media player, say Winamp or iTunes.

There are lots of options to fiddle with the effects control panel. Do some experimenting. Thursday tutorial that comes up first in the Google search for audio visualizer after effects: Audio Visualization in After Effects « Layers Magazine

For audio/video, is the iMac enough? Or is MacPro the way to go?

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