AAC audio is always mono and 200% volume in rendered video. #77528

New Issue

Ryan Graham · 2020-06-06T19:31:23+02:00

Ryan Graham commented

2020-06-06 19:31:23 +02:00

System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 1660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.19

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f5449

Short description of error
When rendering out a video from the VSE using the h264 in MP4 preset and AAC audio codec, the rendered audio is mono and amplified to about 200% compared to preview audio which is stereo. This happens with stereo strips and panned mono strips. I have tested on 2.8, 2.81, 2.82, and 2.83 all giving the same results.

Exact steps for others to reproduce the error
Simply add a stereo audio clip to the VSE and render to FFmpeg using the h264 in MP4 preset with AAC audio codec.

**System Information** Operating system: Windows-7-6.1.7601-SP1 64 Bits Graphics card: GeForce GTX 1660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.19 **Blender Version** Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: `f6cb5f5449` **Short description of error** When rendering out a video from the VSE using the h264 in MP4 preset and AAC audio codec, the rendered audio is mono and amplified to about 200% compared to preview audio which is stereo. This happens with stereo strips and panned mono strips. I have tested on 2.8, 2.81, 2.82, and 2.83 all giving the same results. **Exact steps for others to reproduce the error** Simply add a stereo audio clip to the VSE and render to FFmpeg using the h264 in MP4 preset with AAC audio codec.

Ryan Graham commented

2020-06-06 19:31:23 +02:00

Added subscriber: @NodesAndNoodles

ChristopherAnderssarian commented

2020-06-07 19:26:05 +02:00

Added subscriber: @ChristopherAnderssarian

ChristopherAnderssarian commented

2020-06-07 19:26:05 +02:00

Changed status from 'Needs Triage' to: 'Needs User Info'

ChristopherAnderssarian commented

2020-06-07 19:26:05 +02:00

Hi @NodesAndNoodles,
are you able make a small blend file that shows the issue? I can't seem to recreate the issue.

Just to note, if you're intentionally downmixing then it's expected that the volume would be different.
*Merging stereo to mono, the power of the two stereo channels is added and not averaged. //

Hi @NodesAndNoodles, are you able make a small blend file that shows the issue? I can't seem to recreate the issue. Just to note, if you're intentionally downmixing then it's expected that the volume would be different. *[Merging stereo to mono, the power of the two stereo channels is added and not averaged. ](https:*developer.blender.org/T54418#492826)//

Ryan Graham commented

2020-06-07 21:10:39 +02:00

Certainly! Here's a file with only a stereo WAV file added to the VSE. When I listen to the preview in Blender, I hear it correctly in stereo, but then I render out the video and the problem returns.
Thank you for your time.
AAC Audio Issue Demo.blend

Certainly! Here's a file with only a stereo WAV file added to the VSE. When I listen to the preview in Blender, I hear it correctly in stereo, but then I render out the video and the problem returns. Thank you for your time. [AAC Audio Issue Demo.blend](https://archive.blender.org/developer/F8590840/AAC_Audio_Issue_Demo.blend)

ChristopherAnderssarian commented

2020-06-07 21:32:14 +02:00

Hmm, what happens when you add the rendered file back in to the sequencer?
Could you check what it does in another media player?
I can't seem to recreate the issue even with your file.

Hmm, what happens when you add the rendered file back in to the sequencer? Could you check what it does in another media player? I can't seem to recreate the issue even with your file. ![#77528.PNG](https://archive.blender.org/developer/F8591084/T77528.PNG)

Ryan Graham commented

2020-06-07 21:34:29 +02:00

Is that how the file I sent appears for you? On my end I see only one audio strip and one color strip.

ChristopherAnderssarian commented

2020-06-07 21:39:17 +02:00

In #77528#947893, @ChristopherAnderssarian wrote:

Sorry, the top audio track is from the rendered video

> In #77528#947893, @ChristopherAnderssarian wrote: > ![#77528.PNG](https://archive.blender.org/developer/F8591084/T77528.PNG) Sorry, the top audio track is from the rendered video

Ryan Graham commented

2020-06-07 21:41:43 +02:00

You were right! It was the player I was using! I usually use JetAudio so I tried the same videos in VLC and the audio is correct.
Sorry for wasting your time but many thanks for your help!

You were right! It was the player I was using! I usually use JetAudio so I tried the same videos in VLC and the audio is correct. Sorry for wasting your time but many thanks for your help!

ChristopherAnderssarian commented

2020-06-07 21:45:32 +02:00

Changed status from 'Needs User Info' to: 'Archived'

ChristopherAnderssarian closed this issue

2020-06-07 21:45:32 +02:00

ChristopherAnderssarian self-assigned this 2020-06-07 21:45:32 +02:00

ChristopherAnderssarian commented

2020-06-07 21:45:32 +02:00

No Worries!

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AAC audio is always mono and 200% volume in rendered video. #77528