Addressing Snowing (Static Noise) and Enhancing Video Quality/Size in Our App

[Oleg Ator]

Hi team,

We have a video recording feature in our app. However, the output quality is not very well. It is quite snowing(static noise) even with the default setup in which we got from: https://github.com/android/camera-samples/blob/main/CameraXVideo/app/src/main/java/com/example/android/camerax/video/fragments/CaptureFragment.kt

val rotation = binding.cameraPreview.display.rotation

val resolutionSelector = ResolutionSelector.Builder()
.setAspectRatioStrategy(AspectRatioStrategy(screenAspectRatio, AspectRatioStrategy.FALLBACK_RULE_AUTO))
.build()

val recorder = Recorder.Builder()
.setQualitySelector(qualitySelector)
.setTargetVideoEncodingBitRate(2500000)
.build()

videoCapture = VideoCapture.Builder(recorder)
.setResolutionSelector(resolutionSelector)
.setTargetRotation(rotation)
.build()

In addition to that, video size is being enormous unless we set maximum bitrate. However, while setting a bitrate constraint helps us reduce the video size, but quality is becoming even worse. I am attaching a video sample so you can also check. Do you know how do I get good quality videos while maintaining the size?

Thanks!

[Leo Huang]

Hi,

For video size, please remove the call VideoCapture.setResolutionSelector() since it isn't a public API and may cause conflict to Recorder.Builder().setQualitySelector().
You can also remove the setQualitySelector() call which will result in the default QualitySelector being used.

For video quality, to achieve optimal video quality, CameraX will automatically utilize the manufacturer's predefined video settings (from CamcorderProfile) when only the QualitySelector is specified, ensuring the best possible recording experience across a range of devices. However, if video quality is unsatisfactory on a particular device, manual adjustments (ex: smaller Quality or a different bit rate) may be necessary. Please feel free to report any problems you may experience.

Oleg Ator <o.str...@gmail.com> 於 2023年11月24日 週五 上午3:57寫道：

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[Oleg Ator]

Hello,

Video quality has been improved but video size is still big than it should be(in accordance with our app's requirement). For instance, 1min video is around 20MB but we'd still like to reduce it a bit more, tho. To do so, we set a maximum bitrate of 250000 via

val recorder = Recorder.Builder()
.setTargetVideoEncodingBitRate(2500000)
.build()

and it helped but we wonder if it is possible to have much smaller videos while maintaining quality. We'd like to know what is the best approach;

* Either removing setTargetVideoEncodingBitRate completely
* Or set a smaller bitrate

Thanks

[Leo Huang]

The most straightforward way is by lowering the resolution such as using Quality.SD.

Even adjust the bitrate to be more appropriate based on the resolution.

Adjusting the frame rate to a minimum acceptable value, such as 24fps.

Choosing a more efficient codec is also a solution, but currently there is no API to set the codec type. It can still be done by post-editing. Such as using media3-transformer.

Oleg Ator <o.str...@gmail.com> 於 2023年11月25日 週六 上午5:46寫道：

[Oleg Ator]

Praise to this group and thanks for the answer. However, unfortunately, your advices didn't help to reduce the size. What else can be done?