Develop Reference

Android - Add text or image while recording video?

I am struggling with recording and editing videos. For editing, I found a useful library in Android named ffmpeg4Android. However, I am still get stuck in recording video. Here is what I want:
1/ Add text or images in video while recording
2/ Add filter while recording video
I found there is a library GPUImage for Android but it has only some examples related to taking a photo, not to recording video)
Please let me know if you have any ways or any suggested libraries which can do it.
Thank you in advance!
Links which I read when researching:
Add overlay while record video on Android
How to Record video with GPUImage?
FFMpeg add text to actual video file after recording in Android

You can add an overlay image on video using a blend filter.
You cannot add text directly but you can add the text to the image writing on a canvas.
android-gpuimage library does not natively support video recording but you can try using the android-gpuimage-videorecording library. It is a fork of the gpu-image for android that provides also the video recording functionality
android-gpuimage-videorecording
see the GPUImageMovieWriter class
It should point you in the right direction for developing your own video writer on top of GPUImage.
The idea is to:
draw on current screen surface
switch to encoder input surface and draw previous frame buffer again on it
switch back to screen surface
other useful links: EGL surface helper, Media encoder

Video recording with GPUImage Android

I want to use GPUImage Android to process video in real time. I see example that creating pictures with different filters but I didnt find any example of recording video with filters. Is this possible with GPUImage Android?

android-gpuimage library does not support video recording but you can try using the android-gpuimage-videorecording library. It is a fork of the gpu-image for android that provides also the video recording functionality
android-gpuimage-videorecording
see the GPUImageMovieWriter class
It should point you in the right direction for developing your own video writer on top of GPUImage.
The idea is to:
draw on current screen surface
switch to encoder input surface and draw previous frame buffer again on it
switch back to screen surface
other useful links: EGL surface helper, Media encoder

GPUVideo-android
I know GPUVideo-android. This library apply video filter on generate an Mp4 and on ExoPlayer video and Video Recording with Camera2.
Android MediaCodec API is used this library.
Let's try camera record , video preview and video generate.

Add overlay while record video on Android

I want to record video by camera in my Android device. I need to add overlay image over recorded movie. In iOS I would use GPUImage. In Android I found Android GPUImage. I tried to use it but I didn't found any way to add any filter while video recording. In provided example I could add filters only for taking photos. Is there any ways to record video with filters with Android GPUImage? Is there any other ways to add images overlay over recording video in realtime? If not, is there any ways to add images overlay over recorded video in postprocessing?

You can add an overlay image on video using a blend filter.
About video recording: android-gpuimage library does not support it but you can try using the android-gpuimage-videorecording library. It is a fork of the gpu-image for android that provides also the video recording functionality
android-gpuimage-videorecording
see the GPUImageMovieWriter class
It should point you in the right direction for developing your own video writer on top of GPUImage.
The idea is to:
draw on current screen surface
switch to encoder input surface and draw previous frame buffer again on it
switch back to screen surface
other useful links: EGL surface helper, Media encoder

This project (MagicCamera) has many multiple input filters. You can write your own fragment shader to overlay an image on camera texture (similar to MagicN1977Filter). It also includes video recording.

Video processing with GPUImage Android

I want to use GPUImage Android to process video in real time. I see example that creating pictures with different filters but I didnt find any example of recording video with filters. Is this possible with GPUImage Android?

android-gpuimage library does not support video recording but you can try using the android-gpuimage-videorecording library. It is a fork of the gpu-image for android that provides also the video recording functionality
android-gpuimage-videorecording
see the GPUImageMovieWriter class
It should point you in the right direction for developing your own video writer on top of GPUImage.
The idea is to:
draw on current screen surface
switch to encoder input surface and draw previous frame buffer again on it
switch back to screen surface
other useful links:
EGL surface helper,
Media encoder

GPUVideo-android
This library apply video filter on generate an Mp4 and on ExoPlayer video and Video Recording with Camera2.
Android MediaCodec API is used this library.
This library has many types of filters.
Filters link

Recording a Surface using MediaCodec

So, In my application, I am able to show effects(like blur filter, gaussian) to video that comes from Camera using GPUImage library.
Basically, I (library) will take the input from the Camera, get's the raw byte data, converts it into RGBA format from YUV format, then applies effects to this image and displays on the Surface of GLSurfaceView using OpenGL. finally, to the user, it looks like a video with effects applied.
Now I want to record the frames of Surface as a video using MediaCodec API.
but this discussion says that we can not pass a predefined Surface to the MediaCodec.
I have seen some samples at bigflake where he is creating Surface using MediaCodec.createInputSurface() but for me, Surface comes from the GLSurfaceView.
So, how can I record a frames of a Surface as a video?
I will record the audio parallelly, merge that video and audio using FFMPEG and present to the user as a Video with effects applied.

You can see a complete example of this in Grafika.
In particular, the "Show + capture camera" activity records camera output to .mp4. It also demonstrates applying some simple image processing techniques in the GL shader. It uses a GLSurfaceView and a convoluted dance to keep the recording going across orientation changes.
Also possibly of interest, the "Record GL app with FBO" activity records OpenGL ES rendering a couple different ways. It uses plain SurfaceView and is much more straightforward.