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I'm implementing a camera application on Android devices. Currently, I use Camera2 API and ImageReader to get image data in YUV_420_888 format, but I don't know how to exactly write these data to MediaCodec.

Here are my questions:

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1. What is YUV_420_888?

Sony YUV codec AVI = 1 217 024 KB 57 sec to render Sony YUV 10 it codec AVI = 1 622 023 KB 1 min 12 sec to render Sony YUV and just uncompressed are identical file sizes and behave identical when putting them on the time line. Conclusion, I suspect the Sony YUV codec is the culprit. So the question remains. Can you render an mp4 in Vegas and maintain the color perfectly?. Video Codecs by FOURCC - fourcc.org. FOURCC.org contains definitions of a large number of PC video codecs and pixel formats. Where available, download links are provided. All video codecs support flexible YUV 4:2:0 buffers since LOLLIPOP_MR1. COLOR_FormatSurface is an opaque format that can deliver best performance for MediaCodec, but this comes at price: you cannot directly read or manipulate its content.

The format YUV_420_888 is ambiguous because it can be any format which belongs to the YUV420 family, such as YUV420P, YUV420PP, YUV420SP and YUV420PSP, right?

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By accessing the image's three planes(#0, #1, #2), I can get the Y(#0), U(#1), V(#2) values of this image. But the arrangement of these values may not be the same on different devices. For example, if YUV_420_888 truly means YUV420P, the size of both Plane#1 and Plane#2 is a quarter of the size of Plane#0. If YUV_420_888 truly means YUV420SP, the size of both Plane#1 and Plane#2 is half of the size of Plane#0(Each of Plane#1 and Plane#2 contains U, V values).

If I want to write these data from image's three planes to MediaCodec, what kind of format I need to convert to? YUV420, NV21, NV12, ..?

2. What is COLOR_FormatYUV420Flexible?

The format COLOR_FormatYUV420Flexible is also ambiguous because it can be any format which belongs to the YUV420 family, right? If I set KEY_COLOR_FORMAT option of a MediaCodec object to COLOR_FormatYUV420Flexible, what format(YUV420P, YUV420SP..?) of data should I input to the MediaCodec object?

3. How about using COLOR_FormatSurface?

I know MediaCodec has its own surface, which can be used if I set KEY_COLOR_FORMAT option of a MediaCodec object to COLOR_FormatSurface. And with Camera2 API, I don't need to write any data by myself to the MediaCodec object. I can just drain the output buffer.

However, I need to change the image from the camera. For example, draw other pictures, write some text on it, or insert another video as POP(Picture of Picture).

Can I use ImageReader to read the image from Camera, and after re-drawing that, write the new data to MediaCodec's surface, and then drain it out? How to do that?

EDIT1

I implemented the function by using COLOR_FormatSurface and RenderScript. Here is my code:

onImageAvailable method:

Convert YUV_420_888 to RGB:

MediaCodec:

And in athother thread:

This way works, but the performance is not good. It can't output 30fps video files(only ~12fps). Perhaps I should not use COLOR_FormatSurface and the surface's canvas for encoding. The computed YUV data should be written to the mediaCodec directly without any surface doing any conversion. But I still don't know how to do that.

1 Answer

You are right, YUV_420_888 is a format that can wrap different YUV 420 formats. The spec carefully explains that the arrangement of U and V planes is not prescribed, but there are certain restrictions; e.g. if the U plane has pixel stride 2, same applies to V (and then the underlying byte buffer can be NV21).

COLOR_FormatYUV420Flexible is a synonym of YUV_420_888, but they belong to different classes: MediaCodec and ImageFormat, respectively.

The spec explains:

All video codecs support flexible YUV 4:2:0 buffers since LOLLIPOP_MR1.

COLOR_FormatSurface is an opaque format that can deliver best performance for MediaCodec, but this comes at price: you cannot directly read or manipulate its content. If you need to manipulate the data that goes to the MediaCodec, then using ImageReader is an option; whether it will be more efficient than ByteBuffer, depends on what you do and how you do it. Note that for API 24+ you can work with both camera2 and MediaCodec in C++.

The invaluable resource of details for MediaCodec is http://www.bigflake.com/mediacodec. It references a full example of 264 encoding.

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Hey there. Small channel, first topic.

In messing around with various formats, I find that when I render or compress a video, it messes up the gamma range so colors are washed out and shadows are less dark. I've done some reading, a lot of which was over my head, and it seems that this is because H.264 incorrectly flags video as YUV color (TV color) instead of RGB color (computer color).

I can make it go away on my end by flipping a setting in my video card control panel, but I don't know if that will fix it on the viewer's end.

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Would I be better off trying to figure out how to get my recording software to capture in YUV, or how to get my encoders to render it to RBG? Which one does YouTube use? Or am I thinking about it in completely the wrong way? Does anyone know?

I did find this post: https://www.reddit.com/r/letsplay/comments/457app/case_study_color_space_levelsluminosity_in_sony/

However, it seems to be more about remedial approaches. I'm trying to figure out if there's something I can do to get all my video colorspaces to match so the issue goes away in future videos, and which one would be best.

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Thank you for your attention.

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