> For the complete documentation index, see [llms.txt](https://docs.calibratedsoftware.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.calibratedsoftware.com/tin-man/tin-man-desktop/preferences/import-media.md). # Import Media
These preferences define how Tin Man handles media import defaults when certain metadata is missing or when optimization settings are needed for playback performance. *** **Timebase and Timecode Defaults** * **Indeterminate Timebase**\ Sets the default **frame rate** to apply when a video, audio, or image sequence does not contain valid timebase metadata. * **Indeterminate Timecode**\ Sets the default **starting timecode** for media that lacks embedded timecode information. * **Indeterminate AAC Sample Offset**\ Defines the default **sample offset** for AAC audio, which often has an inherent delay of **2112 samples**. > This value typically shouldn't be changed unless you're compensating for known sync issues. *** **Audio Mapping** * **Discrete Audio Mapping**\ When an audio channel is labeled as "discrete," this setting determines the **default speaker output mapping** for that channel (e.g., mapped to Front Left, Right, Center, etc.). *** **Playback & Performance Settings** * **Playback at High Depth**\ If a file supports multiple bit depths for playback, this sets whether **high bit depth** decoding should be the default. * **Enable Direct I/O**\ When enabled, Tin Man uses **Direct I/O** for faster disk access, improving performance for large files or high-resolution footage. * **Use More Memory**\ Allows the video decode engine to **allocate more memory** for improved decoding performance on capable systems. * **Hardware Decoding**\ Toggles the use of **GPU-accelerated decoding** for supported video formats. > Can improve playback speed and lower CPU usage on supported hardware.