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This could all be user error, but after some preliminary testing: just renaming the files doesn't seem to make them appear. I renamed MLV files manually to .cr2, .png and .jpg and none of them appear in PTP file browsing.

The PTP spec documentation states that "...while it is common to think of the objects that PTP handle as files, they are abstract entities identified solely by a 32-bit object ID."

Maybe there is a file header block one could script to be modified instead, and keep the file name?
L

In Linux, libptp2 gives access to a lot of very useful functions for listing and manipulating the contents of the card in-camera.

Code Select Expand

~ >>> ptpcam -o

Listing supported operations...
Camera: Canon EOS M
  0x1001: GetDeviceInfo
  0x1002: OpenSession
  0x1003: CloseSession
  0x1004: GetStorageIDs
  0x1005: GetStorageInfo
  0x1006: GetNumObjects
  0x1007: GetObjectHandles
  0x1008: GetObjectInfo
  0x1009: GetObject
  0x100a: GetThumb
  0x100b: DeleteObject
  0x100c: SendObjectInfo
  0x100d: SendObject
  0x100f: FormatStore
  0x1014: GetDevicePropDesc
  0x1015: GetDevicePropValue
  0x1016: SetDevicePropValue
  0x91d5: UNKNOWN
  0x101b: GetPartialObject
  0x9101: UNKNOWN
  0x9102: UNKNOWN
  0x9103: UNKNOWN

...as well as listing battery level, and surely some more (less documented) useful stuff.

If we can get the MLV files renamed in-camera, I could contribute some useful scripts, or possibly even a simple GUI app to navigate all this.

Thoughts?

P.S Windows already has PTP/MTP support built in, so windows user could just drag/drop the .cr2 files and rename them to .mlv

Woooowww! That would be absolutely amazing! So, if renamed, would it even be visible via regular MTP browsing?

Has anyone succeeded in importing MLV files from the camera over USB (leaving the card in the camera)? I'm on Arch but run macOS and Win as well, and would be happy with any sketch of a solution.

The reason is I am using a cage and external battery solution that partially blocks the battery/card lid.

Thank you all,
L