No Sound only Video

I just tried to view a Movie on Qucktime. I could only see the video with no sound??

The movie was an .avi file and qucktime converted it to a .mov

Im new to Apple so any help would be appreciated

AVI (Audio-Video Interleave) is a file container—not a compression format. As such, it may contain dozens of audio and video compression formats in hundreds of different cobinations using thousands of settings.

If QT automatically attempted to convert the AVI file, then I assume you are probably using QT X v10.3 under Mavericks which only supports a limited number of codec combinations, Thus, if the audio format in your source AVI file is not supported by the AVFountation-Modernizer-Convert structures embedded in the Mavericks operating system, then you will either end up with no audio track or one with statistics indicating a zero data date and zero data content which QT will not even try to play. (This is the normal case when the "Convert" structure tries to transcode codecs like DTS 6-channel surround sound.)

To get around this problem, I would normally reecommend using a third-party app like the free HandBrake utility which contains its own built-in codec support and does not have to rely on QT configured support. HandBrake contains both device targeted presets for the novice user and an advanced GUI for the x264 codec that appeals to the advanced user who prefers custom file encodings.

You can download VLC player on your Mac if you just want to view the movie.

http://www.videolan.org/vlc/index.html

It plays most multimedia files with no codec packs needed.

If you wanna get the your avi movie workable on such as FCP or iMovie, I would suggest converting it to a Mac readable format -.mp4, QT .mov....

Many programs are there for it. FFmpeg, AppGeeker video converter and many more.

http://www.appgeeker.com/how-to/convert-avi-to-mp4-mac.html

I am also experiencing the same issue. My company has a library of legacy QT movies (some from 2004). Despite their age, they played normally unit our users began to upgrade to QT Player 7.7.4 for Windows. Now the videos play without any audio.

The audio still plays in 7.7.4 QT Pro. I can export them from Pro to restore the audio. Since we are talking about dozens of videos, I'd rather not have to do this for each one.

The audio is encoded as Qualcomm PureVoice, 16-bit mono, 11.025 khz. I can't find any documentation saying that Apple is no longer supporting this codec.

And yes, we've replicated this issue in different browsers and hardware.

Any insights will be appreciated.

Thanks,

Dan

The audio is encoded as Qualcomm PureVoice, 16-bit mono, 11.025 khz. I can't find any documentation saying that Apple is no longer supporting this codec.

Not a Windows nor QualComm PureVoice user but I did run a test on my Mavericks iMac system. Turned on active (encoding) support for Legacy Audio codecs (by default Apple turned off active support when Lion was released) for a quick test and did note that the only sample rate currently available for this codec is 8.000 KHz. Don't know why this would cause a problem—especially in light of the fact that that you indicate the 11.025 KHz sample rate can be properly read during your conversion. Passive (playback) support is still in effect (at least on Mac platforms) and my 8.000 KHz sample rate file did play on my system in QT X v10.3, QT 7 v7.6.6, and QL (system preview) players.

Not sure thisa helps you but thought you might be interested in the results.

so, ive just found out that audio with the file is AC3??

QT 7 (the 32-bit embedded structure) does not support AC3 audio natively and QT X (the 64-bit QT/AVFoundation embedded structures) only supports it natively in "muxed" formats in certain file containers like MPG, MPEG, TS, M2TS, etc. but not in MOV, AVI, or VOB containers. You can play the files in alternative media players like VLC which which have their own built-in codec support, add AC3 codec support for QT 7 player playback, or transcode the files to compression formats and/or file types that are supported by the QT X/7 players. I personally create or convert all of my content to universal QT encodes (MPEG-4 AVC video with AAC and AC3 DD5.1 audio, chapter tracks and burned-in forced English subtitles (where wanted) that play in/on all current QT/QT-based systems and mobile devices.

Baically, you have several options and must decide which workflow best suits your specific needs.

Jon,

Thanks for looking into this and offering advice. I decided the simplest thing for our users is for my team to transcode the files using the codecs and file type you recommended.

Thanks again.

Dan