Replay . EVTFiles

Replay 5000 series introduces a new exported file in addition to .mpg and .ndx. These are .evt files.

Header (8)

Offset	Size	Name	Notes
0	4	static_text	"weas" Only appears on first record.
4	4	headervalue1	0x00000001. Might be version.

Record (24)

Offset	Size	Name	Notes
0	8	timer	nanoseconds since start of recording.
8	4	unknown3	Always 0xFFFFFFFF. Haven't seen this change.
12	4	datatype	1 = audio, 2 video
16	4	audiopower	Audio power used over the last audio interval (normally 24ms)
20	4	blacklevel	Black level (seems to be average color levels) within the last video interval (normally 33ms) (Only 3 bytes might actually be used as R G B respectively.

DataType	Description	Value Field
1	Audio	audiopower
2	Video	blacklevel

The EVT tracks both the fade to silence and fade to black within a timespan. If one is triggered, there are entries for the other if they fall below a certain threshold (not sure the exact values), seems to be 64 for video and 11,000 for audio.

Commercials can be detected by a simultaneous video fade to black and an audio fade.

EVT files larger than around 150K are likely messed up. This appears to be a bug within the ReplayTV OS.

(Big thanks to an anonymous source for figuring this out!)

-- LeeThompson - 29 Jun 2003

Topic EVTFiles . { Edit | Attach | Ref-By | Printable | Diffs | r1.24 | > | r1.23 | > | r1.22 | More }

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