output from openMVG_main_SfMInit_ImageListing is indicating that no usable files were listed in sfm_data.json

[Tomxx7]

All data are in png format. Yet, I am getting the following message:

INFO: [main_SfMInit_ImageListing.cpp:197] You called : openMVG_main_SfMInit_ImageListing
--imageDirectory /home/shoikot/Downloads/Dance1/data/originals
--sensorWidthDatabase /home/shoikot/openMVG/src/openMVG/exif/sensor_width_database/sensor_width_camera_database.txt
--outputDirectory matches
--focal -1
--intrinsics
--camera_model 3
--group_camera_model 1
--use_pose_prior 0
--prior_weights 1.0;1.0;1.0
--gps_to_xyz_method 0
INFO: [main_SfMInit_ImageListing.cpp:478] SfMInit_ImageListing report:
listed #File(s): 0
usable #File(s) listed in sfm_data: 0
usable #Intrinsic(s) listed in sfm_data: 0

can anybody help me with this?

[pmoulon]

It is because your camera is not in the database. Consider either adding your camera model to it or else use the -f option to specify manually a focal prior. The focal prior can be set to 1.2 * max(width, height)... I mean the value of this expression.

[pmoulon]

Sorry read to fast. We don't have metadata read for one (exif). That's why...