Yes, i read that.

Unfortunately nothing helped, i have to re-encode the ac3 audio :(

OR use Vegas 11/12 again :(

It's a pity that an older version of the app work flawless with ac3+video files, coming from SONY 3D cam and MILC!

Thanks for the help!

AC3 and MTS was dropped for W7, mid year in VMS16 so I guess also since VP17 that came few month later.

yes, thank you.

if anybody know a trick (deleting, replacing dll, etc) let me know :)

If it's only 2 channel audio REMUX using shutter encoder to mp4, and choose the option to re-encode the audio to AAC. If it's more than 2 channelsREMUX to mov, re-encoding audio to AAC or wav

yes, shutter encoder is great for this because of batch encoding.

but best would be native import just like old, good Vegas pros

I can import MTS/AC3 files with no problem using Windows 10 and Vegas 19. It this just a Windows 7 problem?

yes, in win10 it works

and it also works under win7 with my V11 and 12.

@relaxvideovv... from your signature, your computer's CPU is an i7-2600. This is a 2nd gen i7 from around 2011- eleven years ago. Are your computer specs in your signature still correct?

If yes, please have a look at the recommended minimum specs for Vegas Pro 19, It's a minimum 6th gen i5 for HD.

Please consider that this may possibly be a contributory issue - not just a W7 v W10 issue.

@Dexcon I don't think the hardware is the reason. I am running Vegas 19 on Q9650 Quad core 3ghz processor 8 gig ram with a GT730 video card. It edits 1920 x 1080 mts files and others with no issue. Rendering is the slow part but editing and previewing in real time is fine.

Yes, i still use i7-2600 and am very satisfied with it :)
I use it with a 1660Ti and 16GB ram even for VR (Quest 2).

When i like to upgrade, i have to replace my cpu, cooler, motherboard and ram modules.
I even have to reinstall both operating systems and all of the apps with lot of tweaks what i did since years.

Too much work, not worth now. I use this system until i can :)

@DMT3 ... I don't think the hardware is the reason

The OS is not hardware as far as I have ever known. From Wikipedia:

An operating system (OS) is system software that manages computer hardware, software resources, and provides common services for computer programs.

Hardware are tangible/physical items like motherboards, GPUs, power supplies, keyboards, mice, etc.

@Dexcon I don't understand your response. You suggested that @relaxvideo hardware was possibly the issue, I pointed out I am using less qualified hardware successfully.

Yes, i still use i7-2600 and am very satisfied with it

That's absolutely fine. But with that comes the real likelihood that the programs for that computer are ideally going to be programs from that era. I liked XP (other than the regular BSODs) but I doubt that many of the programs on that computer (which I still have) will work optimally or at all on W10 or W11.

Sure, what doesn't work (like VR or youtube 8k-360 videos) i can start win10 too.

(but i hate it, lol :) )

And as i wrote win7 was made for 3D stereo, which is my work and hobby, i use it every day.

@DMT3

 don't understand your response. You suggested that @relaxvideo videos hardware was possibly the issue,

I said before: your computer's CPU is an i7-2600. This is a 2nd gen i7 from around 2011- eleven years ago

While the CPU chip is technically a physical item, the use of the term CPU is usually a term that refers to the Operating System (OS) which is held within the CPU chip. i7-2600 is the operating system (OS) - it is software - it is code. Being code, i7-2600 is not a physical item that you can hold in your hand. The OS is the interface between programs and hardware.

For further information, please see https://en.wikipedia.org/wiki/Operating_system

I still don't understand why you are bringing this up. I fully understand the difference between an OS and a CPU. Have a good day.

https://en.wikipedia.org/wiki/Central_processing_unit

I use .mts files on a regular basis. Media Info shows the audio component to be pcm. Can you convert ReMux an odd file or 2 so that the audio is pcm. Your i7-2600 should cope easily with mts. Just stay away from h265.

Have no source of .mts with ac3 so cannot test

My Sony cameras create MTS video with AC3 audio.

Here is one for testing: https://drive.google.com/file/d/1EcXF76vWEu2I_Xd49oSa32mVPGMurubL/view?usp=sharing

Yes, i know my i7-2600 cannot be the problem, i'm very happy with it since years :)
I can edit H265 too with the help of 1660Ti nvdec.

MTS via with AC3 requires a decoder which is only available via more recent versions of Windows 10 (and 11). MTS/AC3 files will not work in VP 19 in windows 7.

But what is the reason it works fine since years under Win7 with Veg11/12?
So Win7 cannot be the problem..

I can even accept this situation when i like to import some special, non-standard file format.

But come on Magix, this is only a standard camcorder file, which i work 90% of my Vegas time.

@relaxvideo,

Your file is accepted without any problem on my VPro 19 with all 4 possible audio-device uses.
So to me it looks not a problem for VPro 19

Cool, but we talk about win7, you know..