Possible causes
- The selected path is not the disc root.
- The image is not mounted or the application cannot read it.
- The current software edition does not support the input type.
Check in this order
- Confirm the source path contains BDMV and CERTIFICATE when applicable.
- Open the same source with a second compatible player or inspector.
- Record the exact application version and source type.
Fix steps
- Mount the ISO or select the directory that directly contains BDMV.
- Use an input mode that the exact software edition officially supports.
When to escalate
Escalate when two independent readers cannot open a complete source and the sanitized error repeats.
If it is still unresolved, collect
- source type
- software version
- operating system
- first 30 sanitized log lines
Known log signatures
no disc | cannot open source | source not found | failed to open disc
Evidence
- tsMuxer 2.7.0 release and capabilities — checked 2026-07-12, review due 2026-10-10