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AC3 (a52) audio codec works in quicktime,… - Apple Community
https://discussions.apple.com/thread/2788644
Hi, I'm trying to edit a .m4v video (H.264 video codec, AC3 (a52) audio codec) in iMovie '11 on MBP 13. The sound does not work. However, I can hear sound in quicktime player and VLC. But I thought that when qt works, iMovie works. Unfortunately, it doesn't. In my other MBP 17 the same video works fine - I can hear sound in iMovie '11.
QT AC3 Codec download | SourceForge.net
https://sourceforge.net/projects/qtac3codec/
AC-3 Compressed Audio (Dolby Digital), Revision A
https://www.loc.gov/preservation/digital/formats/fdd/fdd000209.shtml
AC3 (Dolby Digital) codec under Windows 7 - Microsoft ...
https://answers.microsoft.com/en-us/windows/forum/all/ac3-dolby-digital-codec-under-windows-7/8c361f51-8990-4112-a8cf-deef2ee1ce7e
It uses Quicktime to play back the video files and I think this is where my problem lies. Under XP I use *.m2v files (mpeg2) and their audio in a separate file *.ac3 (Doldy digital) and play back is 100% with audio. Under Windows 7 I do the same thing but Quicktime does not play back the ac3 audio (video is perfect).
Free Download AC3 Filter 2.6b : AC3 Filter is decoding AC3
https://www.free-codecs.com/download/ac3_filter.htm
4.64 from 122 Reviews Developer The AC3 Filter is a free audio decoder and processor filter which allows media players to read files with AC3, DTS and MPEG audio tracks. AC3 is a must have in every codec pack and it is one of the best in its class, as it can be associated with PCM, LPCM, DVD and SPDIF stream as well by using its System tab section.
Download and Install Instructions for AC3 8192 AUDIO ...
https://www.moviecodec.com/audio-codecs/download-and-install-instructions-for-ac3-8192-audio-decoder-for-mac-systems-156727/
If you want QuickTime to recognize and play Dolby AC3 encoded audio from movies, copy the AC3MovieImport component into the /Library/QuickTime folder as well. This definitely won’t hurt and you’ll probably enjoy it later.
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