Explosive audio

Steps causing the bug to occur

  1. Play a movie with a standard stereo PCM encoded sound track

How did the result differ from what you expected?

Movie and audio play fine in the MacOS and Windows.
The sample Vuo composition attached and my speakers “explode”.

When did you first notice this bug?

Aug 2014

Have you found a workaround?

Should not need to. I would have thought the QT engine was handling the audio.

Other notes

  • Vuo version: 0.8.0
  • macOS version: OS X 10.9

movieplayback1.vuo (2 KB)

Screen Shot 2014-08-24 at 9.25.31 am.png

Confirmed. (Ouch, sorry about that.) We noticed that happening for PCM audio a few days ago, too. Scheduled to be fixed in Vuo 0.9.0.

In the meantime, I know offhand that if you encode the movie using FFmpeg with the h.264 video codec and the Vorbis audio codec inside a QuickTime container, it plays just fine.

(In order to support a wide variety of movie formats, to work around QuickTime’s multithreading and performance issues, and to work around QuickTime’s incomplete 64-bit support on Mac OS 10.6, we decided to use FFmpeg to decode movies in Vuo (just like Kineme VideoTools). After the Vuo 1.0.0 release, we’re planning to drop Mac OS 10.6 support, at which point we’ll be able to add AVFoundation support for movie decoding, too.)

In Vuo 0.9, we fixed several audio playback issues, including videos with Linear PCM audio tracks. I also posted an encoding guide.