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Owen Quinlan 2021-07-02 19:29:34 +10:00
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# Troubleshooting Guide
## Table of Contents
- [608/708 Caption Parsing](caption-parsing)
## 608/708 Caption Parsing
**I have a stream with caption data in more than one field, but only captions from one field are being returned**
You may want to confirm the SEI NAL units are constructed according to the CEA-608 or CEA-708 specification. Specifically:
- that control codes/commands are doubled
- control codes starting from 0x14, 0x20 and ending with 0x14, 0x2f in field 1 are replaced with 0x15, 0x20 to 0x15, 0x2f when used in field 2
- control codes starting from 0x1c, 0x20 and ending with 0x1c, 0x2f in field 1 are replaced with 0x1d, 0x20 to 0x1d, 0x2f when used in field 2
**I am getting the wrong times for only some captions, other captions are correct**
If your content includes B-frames, there is an existing [issue](https://github.com/videojs/mux.js/issues/214) to fix this problem. We recommend that you ensure that all the segments in your source start with keyframes, to allow proper caption timing.
[caption-parsing]: /docs/troubleshooting.md#608/708-caption-parsing