Audio decoding fails on some video container formats #41065

Closed
opened 2014-07-14 09:28:58 +02:00 by Niko Suni · 11 comments

System Information
Windows 7 X64, AMD Radeon HD 5800

Blender Version
Broken: Blender 2.71 (Hash 9337574)
Worked: Blender 2.70 (Hash 19e627c)

Short description of error
Audio in some video container formats is not properly decoded, resulting in silence during editing (and also rendering) when using the video sequence editor. The failure pertains to MP4 files in my testing; the audio codec is reported by gspot as "mp4a: MPEG-4 AAC LC".

Other container formats do work; wmv is properly decoded, for example.

My test video was encoded by Lumia 1020 video camera app.

Exact steps for others to reproduce the error
Import a MP4 file as a pair of strips (audio and video) to the video sequence editor, and observe silence. Rendered audio is also silent.

**System Information** Windows 7 X64, AMD Radeon HD 5800 **Blender Version** Broken: Blender 2.71 (Hash 9337574) Worked: Blender 2.70 (Hash 19e627c) **Short description of error** Audio in some video container formats is not properly decoded, resulting in silence during editing (and also rendering) when using the video sequence editor. The failure pertains to MP4 files in my testing; the audio codec is reported by gspot as "mp4a: MPEG-4 AAC LC". Other container formats do work; wmv is properly decoded, for example. My test video was encoded by Lumia 1020 video camera app. **Exact steps for others to reproduce the error** Import a MP4 file as a pair of strips (audio and video) to the video sequence editor, and observe silence. Rendered audio is also silent.
Author

Changed status to: 'Open'

Changed status to: 'Open'
Author

Added subscriber: @nik02

Added subscriber: @nik02

Added subscriber: @Sergey

Added subscriber: @Sergey

Please always attach files needed to reproduce the issue.

Please always attach files needed to reproduce the issue.
Author

Since the forum doesn't apparently let me upload the example video (page throws exception), here is the link:

Test file

Since the forum doesn't apparently let me upload the example video (page throws exception), here is the link: [Test file ](http://www.itagent.fi/audiofailtest.mp4)
Sergey Sharybin self-assigned this 2014-07-14 11:48:39 +02:00

Thanks, will have a closer look when finish fixing current bugs in my queue.

Thanks, will have a closer look when finish fixing current bugs in my queue.

This is a bug in FFmpeg-2.1.4, fixed in 2.1.5. We'll need update FFmpeg used by blender in order to fix this. It'll take some time for platform maintainers.

This is a bug in FFmpeg-2.1.4, fixed in 2.1.5. We'll need update FFmpeg used by blender in order to fix this. It'll take some time for platform maintainers.
Author

Ok. 2.70 will work fine until then.

Ok. 2.70 will work fine until then.

Changed status from 'Open' to: 'Resolved'

Changed status from 'Open' to: 'Resolved'

We've updated FFmpeg for all platforms now. Please try using recent builds from builder.blender.org.

We've updated FFmpeg for all platforms now. Please try using recent builds from builder.blender.org.
Author

Audio decoding works now on build with hash 2366043 (Win/64 bit).

Audio decoding works now on build with hash 2366043 (Win/64 bit).
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Reference: blender/blender#41065
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