# Monitoring manifest update time AWS Elemental MediaPackage playback responses include the following custom headers that indicate when MediaPackage last modified the manifest in non-dynamic ad insertion workflows. These headers are helpful when troubleshooting issues related to stale manifests. ## X-MediaPackage-Manifest-Last-Sequence This is the highest segment sequence number in the manifest. + For DASH, this is the highest segment number in the lowest rendition of the manifest. + For HLS and CMAF, this is the highest segment number in the media playlist. + For MSS, this is the highest segment number in the manifest. See the following section for [manifest examples](#manifest-examples). ## X-MediaPackage-Manifest-Last-Updated The epoch timestamp in milliseconds when MediaPackage generates the segment referred to in `X-MediaPackage-Manifest-Last-Sequence`. ## Manifest examples ### DASH manifest examples For both compact and full DASH manifests, MediaPackage determines the `X-MediaPackage-Manifest-Last-Sequence` value from the highest segment number in the lowest rendition of the manifest. The service calculates the `X-MediaPackage-Manifest-Last-Updated` value based on when it generates the segment referred to in `X-MediaPackage-Manifest-Last-Sequence`. #### Number with duration - compact manifest The following is an example of a compact DASH manifest that uses the number with duration template. MediaPackage determines the `X-MediaPackage-Manifest-Last-Sequence` value from the highest segment number in the lowest rendition in the manifest. For example, in the following manifest, the highest segment number is `index_video_5_0_175232.mp4`, so the value of `X-MediaPackage-Manifest-Last-Sequence` is `175232`. See [`duration` Attribute in the `SegmentTemplate`](segtemp-format-duration.md) for information about how MediaPackage calculates the sequence `$Number$` value. The value of `X-MediaPackage-Manifest-Last-Updated` is the epoch timestamp in milliseconds when MediaPackage generates the segment referred to in `X-MediaPackage-Manifest-Last-Sequence`. ``` ``` #### Number with timeline - compact manifest The following is an example of a compact DASH manifest that uses the number with timeline template. MediaPackage determines the `X-MediaPackage-Manifest-Last-Sequence` value from the highest segment number in the lowest rendition in the manifest. For example, in the following manifest, the highest segment number is `index_video_1_0_7.mp4`, so the value of `X-MediaPackage-Manifest-Last-Sequence` is `7`. The value of `X-MediaPackage-Manifest-Last-Updated` is the is the epoch timestamp in milliseconds when MediaPackage generates the segment referred to in `X-MediaPackage-Manifest-Last-Sequence`. ``` ~~eng~~ ``` #### Number with timeline - compact manifest The following is an example of a compact DASH manifest that uses the number with duration template. MediaPackage determines the `X-MediaPackage-Manifest-Last-Sequence` value from the highest segment number in the lowest rendition in the manifest. For example, in the following manifest, the highest segment number is `index_video_1_0_1675200.mp4`, so the value of `X-MediaPackage-Manifest-Last-Sequence` is `1675200`. See [`media` Attribute in `SegmentTemplate`](segtemp-format-media.md) for information about how MediaPackage calculates the sequence number. The value of `X-MediaPackage-Manifest-Last-Updated` is the is the epoch timestamp in milliseconds when MediaPackage generates the segment referred to in `X-MediaPackage-Manifest-Last-Sequence`. ``` ~~eng~~ ``` ### HLS manifest MediaPackage determines the `X-MediaPackage-Manifest-Last-Sequence` value from the last segment in the manifest. For example, in the following manifest `index_1_3.ts` is the highest segment sequence number, so the value of `X-MediaPackage-Manifest-Last-Sequence` is `3`. The value of `X-MediaPackage-Manifest-Last-Updated` corresponds to the epoch timestamp in milliseconds when MediaPackage generates the last segment in the manifest. ``` #EXTM3U #EXT-X-VERSION:3 #EXT-X-TARGETDURATION:8 #EXT-X-MEDIA-SEQUENCE:0 #EXTINF:7.500, index_1_0.ts?m=1583172400 #EXTINF:7.500, index_1_1.ts?m=1583172400 #EXTINF:7.500, index_1_2.ts?m=1583172400 #EXTINF:7.500, index_1_3.ts?m=1583172400 #EXT-X-ENDLIST ``` ### CMAF manifest Similar to HLS, MediaPackage determines the `X-MediaPackage-Manifest-Last-Sequence` value from the last segment in the manifest. For example, in the following manifest `../cmafseg_video_1_10.mp4?m=1621616399` is the highest segment sequence number, so the value of `X-MediaPackage-Manifest-Last-Sequence` is `10`. The value of `X-MediaPackage-Manifest-Last-Updated` corresponds to the epoch timestamp in milliseconds when MediaPackage generates the last segment in the manifest. ``` #EXTM3U #EXT-X-VERSION:6 #EXT-X-INDEPENDENT-SEGMENTS #EXT-X-TARGETDURATION:12 #EXT-X-MEDIA-SEQUENCE:1 #EXT-X-MAP:URI="../cmafseg_video_1_track_1098178399_csid_aaa_2_init.mp4" #EXTINF:11.250, ../cmafseg_video_1_1.mp4?m=1621616399 #EXTINF:11.250, ../cmafseg_video_1_2.mp4?m=1621616399 #EXTINF:11.250, ../cmafseg_video_1_3.mp4?m=1621616399 #EXTINF:11.250, ../cmafseg_video_1_4.mp4?m=1621616399 #EXTINF:11.250, ../cmafseg_video_1_5.mp4?m=1621616399 #EXTINF:11.250, ../cmafseg_video_1_6.mp4?m=1621616399 #EXTINF:11.250, ../cmafseg_video_1_7.mp4?m=1621616399 #EXTINF:11.250, ../cmafseg_video_1_8.mp4?m=1621616399 #EXTINF:11.250, ../cmafseg_video_1_9.mp4?m=1621616399 #EXTINF:0.542, ../cmafseg_video_1_10.mp4?m=1621616399 #EXT-X-ENDLIST ``` ### MSS manifest MediaPackage determines the `X-MediaPackage-Manifest-Last-Sequence` value from the highest segment in the manifest, as indicated by `Fragments(a_2_0={start time})`. For example, in the following manifest `Fragments(a_2_0=380533333)` is the highest sequence number, so the value of `X-MediaPackage-Manifest-Last-Sequence` is `380333333`. The value of `X-MediaPackage-Manifest-Last-Updated` corresponds to the epoch timestamp in milliseconds when MediaPackage generates the last segment in the manifest. ``` ```