No sound on .mov files - why?

I've just got a MacPro running 10.4.11. If I download a .mov file it appears to play perfectly but with no sound. I have Quicktime 7.5 installed. What can I do about this?
Thanks,
Alex

Sorry, my bad - you already mentioned that it is H.264, about which more here:
http://www.apple.com/quicktime/technologies/h264/faq.html
As you can see these should play in Quicktime 7.5.5 which you presumably have?
As for the missing audio:
Your audio settings may have been changed.
1. Open Audio MIDI Setup (/Applications/Utilities/), then check the Audio Output setting.
2. Change the Audio Output setting to 44100.0 Hz.
3. Quit Audio MIDI Setup.

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HT204382 Hi, Ive just got myself a Macbook Pro, and Im having problems with sound on movie files. The format is wmv and they play OK on a windows 7 laptop, and Im trying to play them now on the MAC. The picture is OK , but no sound. I have Flip4Mac - no d

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http://www.apple.com/quicktime/technologies/h264/faq.html
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We need more information to help you.
Have these MPEG files been "exported"?
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Okays so I know that there are numerous forum discussions out there on this topic but none helped me figure out my problem so I decided to create my own.
I'm trying to take a xxx.mpeg file and convert it to a smaller xxx_web.mov file that I can use for posting on the web and sending to friends easily over ichat. To get my mpeg file I:
1. used mac-the-ripper to get the Video_TS folder from a DVD with now encryption.
2. then I took that .VOB file from that and drug it into MPEG Streamclip to convert the .VOB file to an xxx.mpeg.
All is well up till this point and xxx.mpeg plays fine with sound. Next I tried to use quicktime pro to export my xxx.mpeg file to xxx_web.mov. This gave me video with now sound
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DEMUX to M2V and AIFF.
This worked succussfully as well with the M2V file playing normally in quicktime with sound. I then tried to export the M2V file to a .mov file and got the same outcome...video but no sound.
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Thank you.

1. used mac-the-ripper to get the Video_TS folder from a DVD with now encryption.
If the source DVD is not encrypted, then the VIDEO_TS folder or desired non-zero title VOB series can be copied directly to your hard drive without the use of MTR.
2. then I took that .VOB file from that and drug it into MPEG Streamclip to convert the .VOB file to an xxx.mpeg... I'm trying to take a xxx.mpeg file and convert it to a smaller xxx_web.mov file that I can use for posting on the web and sending to friends easily over ichat.
If you goal is to create a small, web compatible file, you should convert to your final target compression format while in MPEG Streamclip. Most Apple applications use the H.264/AAC compression format for posting to web sites since it generally produces the smallest file for a given level of quality. For instance, selecting the "Export to MPEG-4..." option in MPEG Streamclip, pressing the "iTunes" button, and then selecting an appropriate size/aspect combination will automatically load user settings to create your final file. The 640x480 or 640x360 iTunes option will produce a file similar to the iTunes option in QT Pro (or iTunes) but will also retain your audio.
All is well up till this point and xxx.mpeg plays fine with sound. Next I tried to use quicktime pro to export my xxx.mpeg file to xxx_web.mov. This gave me video with now sound
QT Pro does not fully support multiplexed MPEG compression formats. An MPEG (MPEG2/MP2) compression format will play in the QT player with the QT MPEG-2 Playback component installed but cannot be edited or converted and retain the audio. To retain the audio, you must use a third-party, MPEG-based conversion application like MPEG Streamclip.
Then I read about mpegs being muxed and I needed to demux them. So I used MPEG Streamclip to demux xxx.mpeg with the following option from MPEG Streamclip:
DEMUX to M2V and AIFF.
This work flow creates two elementary stream files. Both the M2V (with MPEG-2 component installed) and the AIFF file are QT Pro compatible. However, they must always be stored together on your hard drive. Since the M2V video file "resources" the AIFF audio in a separate file, if the files are separated, this reference will be orphaned and, as you have seen, you again end up losing your audio.
I just started using MPEG Streamclip can it do everything i'm trying to do (meaning can I bypass using quicktime pro)?... Can someone walk me through what I'm doing wrong?
Already covered. (See above.)
If I export to any format (QuickTime movie, AVI, Windows Media, MPEG-4), all of the audio options are greyed out. Some say explicitly that there is no audio in the source movie. If I go ahead, I get a file with no audio.
The "Save" and "Save As..." options do not convert the compression format. They merely take the data (which you already said plays correctly) and places it in an MOV file container where it continues to play correctly. On the other hand, when you attempt to convert the file to other compression formats (i.e., change the data within the container), then you lose the audio. As indicated above, multiplexed formats like MPEG-2 video with MPEG-1 layer 2 audio are playback only compatible with the QT structure. If you wish to convert the data to a different format and retain the audio, use a third-party, MPEG-based application.
QuickTime is obviously able to decode the .m1a audio since it can play it. Why does it seem to not be aware the audio is there if I try to export it?
Because QT is based on a multi-track engine that synchronizes audio and video frames with reference to external clocking. On the other hand, multiplexed content divides the audio and video into interspersed blocks of data synchronized spatially within a single data stream. QT could theoretically create two separate streams of data but has no way of synchronizing any single frame of audio with its video frame counterpart. The MPEG Streamclip engine can do this but requires the QT MPEG-2 Playback component to then bridge the gap between spatial and temporal based playback engines. Without this temporal relationship the QT player would probably return the infamous "Not a movie" message.

Why does a 1.5Gb QuickTime movie file take up 5.8Gb in iDVD?!

I've just converted an old VHS tape to DVD and then used Wondershare DVD Ripper to convert this to a QuickTime movie file (*.mov). This resulting QT file is 1.5Gig in size. When I then add this movie into iDVD, it immediately takes up over 5Gig of project space and thus is too big for a normal 4.7Gig DVD. How can this be? The movie fit on a 4.7Gig DVD to begin with with some room to spare to why does it see so much expansion within iDVD?
- CDM

CDM -- The Quicktime .mov format is a so-called container format -- and what's inside can be compressed or saved in different ways. So you could have a highly compressed Quicktime file that doesn't take up too much disc space. But, if you want that file on a DVD video disc (that plays on a regular DVD player), it must be in a format and structure that is standardized. MPEG-2 is the DVD standard format, and so it is entirely possible that your highly compressed video won't fit on a standard DVD video disc (in mpeg-2 format).
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I'd suggest focusing on your video duration. Also, you are likely to obtain better video quality if you minimize the changes to video format -- VHS to DVD is both a conversion of analog to digital as well as a compression to mpeg-2 format. It sounds like you're then converting that into a Quicktime compressed format (mpg4?), and then iDVD is compressing it back into mpeg-2 for the final DVD. If you're editing the video, then you're typically stuck with all those conversions, but there are alteratives if you're not happy with the results (eg, MPEG Streamclip to cut up your DVD footage and Roxio Toast to copy those mpeg-2 files back to a playable DVD).
John

HT1657 I downloaded Looper and the sound is completely out? the movie is about 10 seconds a head of the sound? Anyone know why?

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Hi jackim2009,
If you are having issues with the audio during video playback in iTunes, you may find the following articles helpful:
iTunes and QuickTime for Windows: Audio does not play or plays incorrectly
http://support.apple.com/kb/ts1362
Apple Support: iTunes for Windows plays video files without any audio
http://support.apple.com/kb/TS1696
Regards,
- Brenden

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Are you getting any error messages? What do they say? Exactly what occurs when you try to open the .mov file?
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Mac OS X (10.5.7)
Please correct.

No sound on .mov files - why?

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