No AAC audio using Sony AVC (.mp4) SVP11.

[Bernd Porr]

Couldn’t resist the temptation to try it out…
Works nicely with MP4Box. Summary here:

Download GPAC and install it on your computer.
Extract the H264 from the MPEG4 file:
MP4Box -raw 1 attr_2_resiliance03_sonyavc.mp4
assuming that stream 1 contains your H264.
Merge with AC3 audio:
MP4Box -add attr_2_resiliance03_sonyavc_track1.h264 -add attr_2_resiliance03.ac3 merged.mp4

https://berndporr.blogspot.com/2011/11/how-to-merge-mpeg4-with-ac3-audio.html

/Bernd

[Steve Denys]

Same problem here: no sound with sony avc, with mainconcept everything works fine 🙁

[Bernd Porr]

I’ve filed a bug report at Sony’s web site. Haven’t got a reply yet.
/Bernd

[Hayden Roberts]

[Bernd Porr] “I’ve filed a bug report at Sony’s web site. Haven’t got a reply yet.
/Bernd”

Thank you. I really think this is a bug seeing as now a few more people have reported the same problem. Can’t wait to get this fixed.

Hayden.

[Arthur Bueno]

Hi Hayden,
Since only few people report this problem: could it be related to your video card? The Sony AVC rendering in Vegas 11 uses the GPU.
I don’t get any audio either, and have a 460GTX (MSI) card.
Vegas also refuses to render to Mainconcept AVC with GPU on, on this card, although it should support it.

[Dave Lozinski]

I have a laptop with the nVidia GTX 460M video card and both the Sony and Main Concept avc render fine with audio.

If it’s not working for your video card make sure you have the latest drivers. For the nVidia 460 series you have to have driver version >= 270.xx

—————————————–
https://www.davelozinski.com
https://www.davelozinski.com/DemoReel/
—————————————–

[Hayden Roberts]

[Dave Lozinski] “I have a laptop with the nVidia GTX 460M video card and both the Sony and Main Concept avc render fine with audio.

If it’s not working for your video card make sure you have the latest drivers. For the nVidia 460 series you have to have driver version >= 270.xx
“

I have two GTX 580’s in my PC and I update my drivers the day they are released.

MainConcept works fine for me (and others it seems) while Sony AVC only renders video without audio (again, others are having same issue). The Sony AVC *should* use the same codec for the audio (ACC) but it doesn’t even try. There are no errors (driver or otherwise) and Vegas doesn’t even attempt to render the audio.

If this were a CUDA driver issue, then Sony AVC or MainConcept would error when trying to render anything. Also, the problem then would solve itself if “CPU only” was selected when rendering. This doesn’t solve the issue thus eliminating any GPU driver issues.

[Lukasz Tomecki]

I had been experiencing the same problem.

What i did is I matched exactly the settings of the input audio (256 Kbps, 44 100 Hz, Stereo, MPEG Layer-3 in this instance) with the render settings. Previously, when those settings differed, I’d had no audio in the output file.

Hope this helps

cherrs

[Lukasz Tomecki]

Wow,

now after few minutes of happiness I discovered another weird thing.

Media player classic plays the audio, whereas BEST player does not.

I’m confused.

[Hayden Roberts]

[Lukasz Tomecki] “What i did is I matched exactly the settings of the input audio (256 Kbps, 44 100 Hz, Stereo, MPEG Layer-3 in this instance) with the render settings. Previously, when those settings differed, I’d had no audio in the output file. “

This still doesn’t work for me. After reading your next post, it seems like you are having a media player/codec issue. You should install MediaInfo and that will tell you if the audio stream is there or not.

As you can see from report in the original post, no audio is being rendered so it’s not a playback issue like you reported. There is just no audio to be played…