I recently picked up a Panasonic Lumix TZ3 (the one with the 10x zoom, 28-280mm equivalent) and overall I’m thrilled with the still images. But the video side is driving me crazy. I take short clips occasionally, and the camera saves them as MOV files in this odd JPEG Motion Picture format. On Windows 10, I can’t rename or delete certain MOV files – Windows says they’re ‘in use by another process’. It’s always just one file, not all of them. I thought maybe it was linked to a companion JPG, but nope, the JPGs are fine. This happened with my old point-and-shoot too, and a reboot usually fixed it. But now it’s persistent.
I suspect Windows is choking on the AVCHD Lite format these MOV files use. Is there a way to convert them to something more friendly like MP4 without losing quality? Or maybe someone has found a registry hack to stop Windows from locking them? Any help appreciated!
AVCHD is a file-based format for the digital recording and playback of high-definition video. It is H.264 and Dolby AC-3 packaged into the MPEG transport stream, with a set of constraints designed around camcorders. — Read more on Wikipedia
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title: Panasonic Video Compatibility Workflow
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flowchart TB
A[User has MOV/AVCHD files] --> B{Can Windows play files?}
B -->|Yes| C[Enjoy playback]
B -->|No| D[Install codec pack]
D --> E[Try playing again]
E --> B
D --> F[Convert to MP4 using HandBrake]
F --> G[Play MP4 files]
G --> C
I had the exact same issue with my Lumix ZS3. The MOV files would appear on the SD card but I couldn’t copy them via USB – they just weren’t visible. Here’s what worked for me:
Copy, don’t move: Copy the entire ‘PRIVATE/AVCHD’ folder from the SD card to your PC. The video files are inside that folder, not in DCIM.
Uncheck ‘Archived’: After copying, right-click the original MOV file on the SD card, go to Properties, and uncheck ‘Archived’ under Attributes. Then you can delete it.
Use VLC to play: VLC media player handles AVCHD files perfectly on Windows. No need for QuickTime (which is outdated and causes these lock-ups in the first place).
Convert to MP4: For editing, I use HandBrake (free) to convert the AVCHD Lite footage to H.264 MP4. That makes them editable in any modern video editor.
Also, make sure QuickTime is completely uninstalled – its registry entries can interfere with MOV files even when not running. That solved the ‘in use’ problem for me.
Great advice from Lori. I’ll add a few more points:
AVCHD Lite is essentially H.264 video: The camera records in the AVCHD format (a highly compressed long-GOP codec) wrapped in a MOV container. Modern Windows (10/11) has native support, but older compatibility issues linger.
Use a modern media player: VLC or MPC-HC will play these files smoothly. Windows Media Player may not handle them without codec packs.
For quick editing: You can import the MOV files directly into DaVinci Resolve (free) or Adobe Premiere – they handle AVCHD natively. If performance is slow, proxy editing is your friend.
Convert with HandBrake: As Lori mentioned, HandBrake can re-encode to a more edit-friendly format like ProRes or high-bitrate MP4. Just keep the ‘Same as source’ framerate and adjust quality to your liking.
One more thing: if you’re still on an older Windows version, consider updating to Windows 10/11. The legacy QuickTime issue is a known cause of file locking, so uninstalling it is essential. Also, check if your camera’s firmware is up to date – Panasonic released updates improving file compatibility for some models.
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