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Remove mention of #36 from troubleshooting guide

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The 091217b workaround of telling ffmpeg to only request the video
stream works perfectly fine for now. I'll revisit when adding audio
support (#34).

Fixes #36
This commit is contained in:
Scott Lamb 2019-02-13 22:25:33 -08:00
parent 091217b1a4
commit d7a0cb9a7c
1 changed files with 2 additions and 29 deletions
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31
guide/troubleshooting.md
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@ -29,40 +29,13 @@ Logging options are controlled by environmental variables:
### `Error: pts not monotonically increasing; got 26615520 then 26539470`
If your streams cut out with an error message like this one, there are a
couple possibilities.
One is that your camera outputs [B
If your streams cut out with an error message like this one, it might mean
that your camera outputs [B
frames](https://en.wikipedia.org/wiki/Video_compression_picture_types#Bi-directional_predicted_.28B.29_frames.2Fslices_.28macroblocks.29).
If you believe this is the case, file a feature request; Moonfire NVR
currently doesn't support B frames. You may be able to configure your camera
to disable B frames in the meantime.
A more subtle problem occurs in cameras such as the Dahua Starlight series
when the following is true:
* Audio is enabled (thus a single RTSP session has two streams).
* The camera's clock changes abruptly. Note that many cameras use SNTP
rather than NTP to adjust time, so they consistently step time rather
than slew it.
* They send RTCP Sender Reports (these include the NTP time).
Moonfire NVR currently uses the ffmpeg library to talk to the cameras. ffmpeg
doesn't properly support this situation. It uses the NTP time to adjust the
PTS and DTS, and thus experiences jumps forward and backward. The forward
jumps cause one frame to be artificially lengthened. The backward jumps create
an impossible situation which causes Moonfire NVR to abort the session and
retry.
In the long term, Moonfire NVR will likely implement its own RTSP support.
In the short term, you can use either of two workarounds:
* Disable audio in the camera settings. Note that Moonfire NVR doesn't
yet support recording audio anyway.
* Disable time adjustment. You'll likely want to disable in-picture
timestamps as well as they will become untrustworthy.
### `moonfire-nvr config` displays garbage
This happens if your machine is configured to a non-UTF-8 locale, due to