[ttml-webvtt-mapping] Is the example conversion at "2.2.4.1.3 Time Expression" incorrect? (#34)

SnakeWhisperer has just created a new issue for https://github.com/w3c/ttml-webvtt-mapping:

== Is the example conversion at "2.2.4.1.3 Time Expression" incorrect? ==
Can someone explain the parameters and/or method used for the example conversion of **01:02:43:07** at **29.97 fps**? I'm getting a different value when converting.

The first example takes **01:02:43:07** at **30 fps** and gets **01:02:43.233** (3,763.233333 seconds), which is the same I get. However, for the second one, the document gets **01:02:43.234**, but I get the following:

<br>

### If non-drop frame is considered:

**01:02:43:07** => **112,897** frames

$$112,897 frames/(30000/1001) f/s = 3,766.996566 seconds$$

Which gives us **01:02:46.997**


<br><br>

### If drop frame is considered:

**01:02:43:07** => **112,897** counted frames => **112,785** rendered/scanned frames (112 frames have been dropped)

$$112,785 frames/(30000/1001) f/s = 3,763.2595 seconds$$

Which gives us **01:02:43.260**

Please view or discuss this issue at https://github.com/w3c/ttml-webvtt-mapping/issues/34 using your GitHub account


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Received on Friday, 27 January 2023 16:50:26 UTC