---
title: kCMSampleAttachmentKey_HasRedundantCoding
framework: coremedia
role: symbol
role_heading: Global Variable
path: coremedia/kcmsampleattachmentkey_hasredundantcoding
---

# kCMSampleAttachmentKey_HasRedundantCoding

Indicates whether the sample has redundant coding (type CFBoolean).

## Declaration

```swift
let kCMSampleAttachmentKey_HasRedundantCoding: CFString
```

## Discussion

Discussion This key has no default value. If this key is not present, redundant coding information for the sample is unknown.

## See Also

### Sample Keys

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