P: Audio of AVCHD files in .MTS format with PCM audio does not play correctly - sounds like noise

[kgroupcompanies]

[Subject line updated by moderator]

Using the latest version of PP (25.3.0) I was working on a project containing MTS video files, and all of a sudden the next day I opened up the project, and all of the audio tracks of the clips had max volume static (and nothing else). It had been working for several days. In the audio track timeline, it displays as just a solid bar, rather than a typical bar with variying levels as you'd expect (see attached). It is like this in the editor, and also if you export the video.

I messed with this for hours, including contacting Adobe Support Chat for about an hour. They weren't able to help. They left me with suggesting that I make sure all of my Windows updates were in place. I did that and still nothing. I messed with my video card drivers - making sure they were on the latest version, etc. I downloaded the AC3/AC4 codecs from the other Adobe post talking about MTS files not working in the latest version of Windows - that didn't help. I also have cleared cache several times, and I tried re-insatlling the latest version of PP.

If you open the files by themselves in Windows, they are fine. The audio is normal. They work fine in MS Clipchamp. They also work fine an older version of Premiere Pro that I downloaded (24.6.5). So, theoretically, I could start over and do this in 24.6.5, but I'd prefer to continue working in the latest version. I'm sure this is codec related or something, but I have hit a brick wall.

Has anyone else had this specific issue, and have you found a solution? Thanks

[MisterAdvent]

Is this fixed?   Looks like it might be in the beta.  Just loaded an M2TS and it worked.  (25.6.0 build17)

Tried it in shipping version  (25.3.0 build 84) and playback fails.

[robwilkenproductions]

Thanks for moving it. Agree, not easy to navigate. Would be nice to know when issue is resolved.

[Antonio PAK]

Adobe HAS to do the upgrade because every month I we are paying ....Please

Grazie

AP

[george_9462]

I had the same problem.  It seemed that the problem was in the camera.  Our cameras audio settings were set to Linear PCM.  Switched it to Dolby audio and the problem went away.  Our cameras were set to Linear PCM for years with no problem importing to Premiere.  This changed in one of the latest updates.  We had to run the raw footage through Handbrake in order to get it to play in Premiere.  After switching the camera setting, no more problem. 

[nos31213129oixt]

Try updating Adobe Premiere version 25.4.0, it's already in Creative Cloud, the sound from AVCHD is normal

[GlenMeyburgh]

Latest update means you can hear the audio buy waveforms are naccurate.
Changing to camera audio to Dolby instead of PCM worked a treat, thanks george_9462 🙂
Audio and waveforms as normal.

[danm32376722]

Is this fixed with the latest non beta release?

[nos31213129oixt]

yes 100 %

[GlenMeyburgh]

Not the PCM waveform. You can hear the audio, just not see it 🙂
Dolby works perfectly.

[Fergus H]

Hi all, 

This issue has been fixed in the v25.4 release of Premiere Pro and Media Encoder. 

Regards,

Fergus

[LuMags]

Hi, been reading through this and, despite being on 25.5 .MTS files are still problematic. They never used to be though. About 6 mths ago it was all fine, then something changed and its knackered it.

My scenario is that if I play .MTS in VLC player the audio is fine. In Premiere it doesnt even bring in the audio to the timeline if a clip is dragged & dropped from a bin into a new timeline. I've had this with other video clip formats and, oddly, if I "New Sequence from clip" that does create a video and audio track which I then have to cut and paste into my first timeline. It's clunky and moreso a workaround than a solution.

This also happens if I create an entirely new project and use the Import Wizard as another post suggested.

Interestingly, the same happens with Resolve.

Why can VLC handle this but not pro-grade software?

Advice welcomed.

Cheers,

Lu

[LuMags]

SOLUTION:

Spank it into Handbrake, convert to MP4, and you're golden.

Results in

But this shouldn't be the case. I shouldn't have to use free software to fix a shortcoming from a paid for, premium grade software.

[Warren Heaton]

@LuMags 

When MTS files are playing in an app like VLC Player, they're just being decompressed for playback which MTS is designed to do very efficiently.

When MTS files are imported into a video editing application (if the application supports it), they're being demuxed for editing.  That is, the audio and video streams are separated such that they behave as independ files and are more like, but still not the same as, formats meant for editing.

Definately try importing and playing whatever source you have to see how it performs on your system.  If converting MTS for editing, I'd recommend going with ProRes 422 LT or if disk space is very limted ProRes 422 Proxy.