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Update camera.ffmpeg.markdown

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Pascal Vizeli 2016-08-31 08:43:32 +02:00 committed by GitHub
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@ -42,3 +42,13 @@ Configuration variables:
You can control the `image quality` with [`extra_arguments`](https://www.ffmpeg.org/ffmpeg-codecs.html#jpeg2000) `-q:v 2-32` or with lossless option `-pred 1`.
### {% linkable_title Troubleshooting %}
In most of case, ffmpeg autodetect all needed options to read a video/audio stream or file. But it is possible in rare cases that's needed to set a option to help ffmpeg. Default ffmpeg use 5 seconds to detect all options or abord.
First check, if your stream playable by ffmpeg with (use option `-an` or `-vn` to disable video or audio stream):
```
ffmpeg -i INPUT -an -f null -
```
Now you can see what going wrong.