QuickTime icon
QuickTime icon

How to use QuickTime Player to play media files on your Mac
QuickTime Player is a great application for playing media content, including HD (high definition) video in OS X. QuickTime Player supports many modern codecs and file formats, so simply double-click your media file in the Finder and it will open in QuickTime Player. If a media file doesn't automatically open in QuickTime Player by double-clicking it, you can choose the Open File option from the File menu, browse to the file's location, and select it. Additionally, you can open a streaming media file (or event) by clicking the File menu and then choosing Open Location and entering the Internet address (the URL) for the movie file.
The playback controls in QuickTime Player work simply with Rewind and Fast Forward buttons, and with the Play button handling both playback and stopping.

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The timeline at the very bottom of the player shows your current viewing progress and can be dragged (left or right) to move to a desired position or time by using the mouse. This is helpful for moving through lengthy media files, especially when searching for a specific moment or event. The total playback time remaining is listed on the bottom-right corner of the playback controls when the controls are open. If you want to see the lenght of the clip, just click on the time remaining.
Full-screen in QuickTime
QuickTime Player use the full-screen features built-in to OS X to give you maximum screen viewing space of your movies or clips. To make QuickTime Player fill your entire screen, click the full-screen button, which is located on the top-right of the playback controls or in the top-right of the QuickTime Player window with two arrows pointing outwards. While you are in full screen you can switch to another app without leaving full-screen by swiping left or right using three fingers. The menu bar will appear if you move the mouse pointer to the top of the screen. From there, you can click the View menu and select one of several scaling modes to find the perfect fit for you display. To make the screen go back to it's original size, simply click the Full Screen button once again or press Escape (esc).
Supported media file formats
QuickTime Player supports a wide variety of popular audio and video file formats and codecs. To learn more, seeMedia formats supported by QuickTime Player.
About Audio and movie recording in QuickTime Player
You can make a movie using QuickTime Player and the camera in your Mac by clicking the File menu and choosingNew Movie Recording. When the recording interface appears, the FaceTime or iSight camera becomes active (a green light appears by your Mac's built-in camera). Simply press the circular record button once to start or stop your recording.
Clicking the triangle icon gives you additional options, such as letting you choose whether to use the built-in iSight camera an external camera you've connected to your Mac, and lets you adjust the finished quality of your recording.
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To make an audio-only recording, simply choose New Audio Recording from the File menu. Press the circular record button once to start or stop your recording. You will notice that the current running file size is displayed on the bottom right of the controls while you're recording; this changes to the total elapsed time when you stop recording. The sound meter (located at the bottom of the controls) makes it easy to ensure your volume level is consistent, and is helpful for making sure you're sitting an appropriate distance from the microphone. About 21 inches of distance between you and the microphone is a good place to start.
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Clicking the triangle gives you additional options, such as letting you choose whether to use the built-in microphone on your Mac, an external microphone you've connected to your Mac, a microphone from a connected Apple display, and lets you adjust the finished quality of your recording.
Tip: Changing the quality from High to Maximum will produce a very high-quality uncompressed movie file. However, uncompressed audio files can use large amounts of disk space.

Export audio only using QuickTime Player
QuickTime Player gives you the option of exporting and sharing only the audio portion of your video. To export only the audio portion of your video, open your video in QuickTime Player. Choose Export from the File menu. Type a name in the “Export As” field. Then from the Format pop-up menu, choose “Audio Only” and click Export.

Screen recording in QuickTime Player
You can use QuickTime Player in OS X Lion to make a video recording of your screen or just a region of your screen and save it as a movie file for later viewing. This can be helpful for showing others how to perform a task, workflow, or for training.
Click the File menu in QuickTime Player and choose New Screen Recording. To start recording what's occurring on your Mac's screen, press the round record button in the controls that open. If you want to record the entire screen, click anywhere on the screen to start recording.
Tip: To record just a smaller portion of the of the screen, drag your pointer to select the region of the screen you want to record, and then click Start Recording.
To stop recording your Mac's screen, you can click the stop button in the menu bar, or press the Command-Control-Escape key combination (all at once) on the keyboard.
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Clicking the downward triangle gives you additional options, such as letting you choose whether to use the built-in microphone on your Mac, an external microphone you've connected to your Mac, a microphone from a connected Apple display, or the option to simply use no microphone at all. The triangle also allows you to adjust the finished quality of your screen recording, select whether or not your mouse clicks are shown during the recording (the pointer is highlighted when you click), and to select what location (on your Mac) to save your screen recording when finished.
Tip: Changing the quality from Medium to High will result in higher-quality movie file with a larger file size.

Trim media files using QuickTime Player
To easily and quickly edit media files:
  1. Open them in QuickTime Player.
  2. Click the icon with a single arrow that is located to the right of the Fast-Forward button and above the time.
  3. In the menu that opens, choose Trim. The trimming bar appears.
  4. To select the portion of the recording you want to keep, drag the yellow trimming bar handles to the left and right as desired.
  5. When you are ready, simply click Trim and that unwanted footage outside the the yellow trimming bar is removed.
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Rotate or flip clips in QuickTime
If you have a clip that is upside down or sideways, you can rotate or flip it to correct it. To rotate or flip a clip, open them in QuickTime player. Then from the Edit menu choose Rotate Left, Rotate Right, Flip Horizontal, or Flip Vertical depending on the rotation or flip need to correct the clip.

Merge clips or movies using QuickTime Player
In QuickTime Player you can take multiple clips or an entire movie that you have and combined them into a single movie. To add a clip or entire movie to your movie, open your movie in QuickTime Player, then drag the clip or movie you want into your movie window–QuickTime Player will automatically scale or crop the clip or movie to match your movie.

Sharing your media files
Do you want to share one of your audio or video files with others? You can share your files to your iTunes library and then add it to your iPhone and iPod, Apple TV, or iPad. If you have a MobileMe account, you can send your files to your MobileMe Gallery. You can also send your files directly your YouTube, Vimeo, Flickr, and Facebook account. If you choose to send your movie to Mail, your file is added to a new message in Mail so you can easily email it to others. If you want to use iMovie, you can send your file from QuickTime to iMovie.
In QuickTime Player, open the media file that you want to share. Next, click the icon with a single arrow to the right of the Fast Forward button, which is located directly above the time. In the menu that opens, choose iTunes, MobileMe Gallery, YouTube, Vimeo, Flickr, Facebook, Mail, or iMovie.
  • If you choose iTunes, you'll be prompted to pick whether you want to save your file for best viewing on an iPhone or iPod, an Apple TV, or a computer, and then save the file in your iTunes library for easy syncing.
  • If you choose MobileMe, YouTube, Vimeo, Flickr, or Facebook, you'll be presented with a login screen where you must enter your login information before sharing your file.