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Example shows reading the output from a Bandwidth Estimator and switching to the file that matches.
49 lines
2.0 KiB
Markdown
49 lines
2.0 KiB
Markdown
# bandwidth-estimation-from-disk
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bandwidth-estimation-from-disk demonstrates how to use Pion's Bandwidth Estimation APIs.
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Pion provides multiple Bandwidth Estimators, but they all satisfy one interface. This interface
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emits an int for how much bandwidth is available to send. It is then up to the sender to meet that number.
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## Instructions
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### Create IVF files named `high.ivf` `med.ivf` and `low.ivf`
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```
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ffmpeg -i $INPUT_FILE -g 30 -b:v .3M -s 320x240 low.ivf
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ffmpeg -i $INPUT_FILE -g 30 -b:v 1M -s 858x480 med.ivf
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ffmpeg -i $INPUT_FILE -g 30 -b:v 2.5M -s 1280x720 high.ivf
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```
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### Download bandwidth-estimation-from-disk
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```
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go get github.com/pion/webrtc/v3/examples/bandwidth-estimation-from-disk
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```
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### Open bandwidth-estimation-from-disk example page
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[jsfiddle.net](https://jsfiddle.net/a1cz42op/) you should see two text-areas, 'Start Session' button and 'Copy browser SessionDescription to clipboard'
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### Run bandwidth-estimation-from-disk with your browsers Session Description as stdin
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The `output.ivf` you created should be in the same directory as `bandwidth-estimation-from-disk`. In the jsfiddle press 'Copy browser Session Description to clipboard' or copy the base64 string manually.
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Now use this value you just copied as the input to `bandwidth-estimation-from-disk`
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#### Linux/macOS
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Run `echo $BROWSER_SDP | bandwidth-estimation-from-disk`
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#### Windows
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1. Paste the SessionDescription into a file.
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1. Run `bandwidth-estimation-from-disk < my_file`
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### Input bandwidth-estimation-from-disk's Session Description into your browser
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Copy the text that `bandwidth-estimation-from-disk` just emitted and copy into the second text area in the jsfiddle
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### Hit 'Start Session' in jsfiddle, enjoy your video!
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A video should start playing in your browser above the input boxes. When `bandwidth-estimation-from-disk` switches quality levels it will print the old and new file like so.
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```
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Switching from low.ivf to med.ivf
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Switching from med.ivf to high.ivf
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Switching from high.ivf to med.ivf
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```
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Congrats, you have used Pion WebRTC! Now start building something cool
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