---
title: kCMSampleAttachmentKey_IsDependedOnByOthers
framework: coremedia
role: symbol
role_heading: Global Variable
path: coremedia/kcmsampleattachmentkey_isdependedonbyothers
---

# kCMSampleAttachmentKey_IsDependedOnByOthers

Indicates whether other samples depend on this sample for decoding (type CFBoolean).

## Declaration

```swift
let kCMSampleAttachmentKey_IsDependedOnByOthers: CFString
```

## Discussion

Discussion This key has no default value. If this key is not present, dependency information for the sample is unknown. If this key is present and its value is kCFBooleanFalse, the frame is considered droppable. This attachment is read from and written to media files.

## See Also

### Sample Keys

- [kCMSampleAttachmentKey_NotSync](coremedia/kcmsampleattachmentkey_notsync.md)
- [kCMSampleAttachmentKey_PartialSync](coremedia/kcmsampleattachmentkey_partialsync.md)
- [kCMSampleAttachmentKey_DependsOnOthers](coremedia/kcmsampleattachmentkey_dependsonothers.md)
- [kCMSampleAttachmentKey_DisplayImmediately](coremedia/kcmsampleattachmentkey_displayimmediately.md)
- [kCMSampleAttachmentKey_DoNotDisplay](coremedia/kcmsampleattachmentkey_donotdisplay.md)
- [kCMSampleAttachmentKey_EarlierDisplayTimesAllowed](coremedia/kcmsampleattachmentkey_earlierdisplaytimesallowed.md)
- [kCMSampleAttachmentKey_HasRedundantCoding](coremedia/kcmsampleattachmentkey_hasredundantcoding.md)
- [kCMSampleAttachmentKey_PostDecodeProcessingMetadata](coremedia/kcmsampleattachmentkey_postdecodeprocessingmetadata.md)