AndroidVideoTranscoder

Surprisingly fast on device video transcoding.

Features

• extracting images from video either ffmpeg or mediacodec
• creating video from image either ffmpeg or mediacodec

How to use FFMpeg Part

Extracting frames

FFMpegTranscoder.extractFramesFromVideo(
		context = application, 
		frameTimes = times, 
		inputVideo = inputVideo, 
		id = "12345", 
		outputDir = frameFolder
	)
	.subscribeOn(Schedulers.io())
	.observeOn(AndroidSchedulers.mainThread())
	.subscribe(
	{ logv { "extract frames ${it.progress} ${it.message} ${(it.duration / 1000f).roundToInt()} s" } },
	{ logv { "extracting frames failed ${it.message}" }}, 
	{ logv { "extracting frames successfully completed" } }
)
.addTo(subscription)

Merging frames to create video

FFMpegTranscoder.createVideoFromFrames(
	context = application,
	frameFolder = frameFolder,
	outputUri = outputVideo,
	config = EncodingConfig(
	sourceFrameRate = 30 // every source image is a frame
	)
)
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(
	{ logv { "merging frames ${it.progress} ${it.message} ${(it.duration / 1000f).roundToInt()} s" } },
	{ logv { "merging frames to create a video failed ${it.message}" }}, 
	{ logv { "video creation successfully completed" } }
)
.addTo(subscription)

How to use MediaCodec Part

Extracting frames

 MediaCodecTranscoder.extractFramesFromVideo(
	context = this,
	frameTimes = times,
	inputVideo = inputVideo,
	id = "loremipsum",
	outputDir = frameFolder,
	photoQuality = 100
    )
	.subscribeOn(Schedulers.io())
	.observeOn(AndroidSchedulers.mainThread())
	.subscribe(
	    { logv { "extractFramesFromVideo progress $it" }},
	    { logv { "extracting frames failed ${it.message}" }}, 
	    { logv { "extracting frames successfully completed" }}
	).addTo(subscription)

Merging frames to create video

MediaCodecTranscoder.createVideoFromFrames(
	frameFolder = frameFolder,
	outputUri = outputVideo,
	deleteFramesOnComplete = true
    )
	.subscribeOn(Schedulers.io())
	.observeOn(AndroidSchedulers.mainThread())
	.subscribe(
	    {logv { "createVideoFromFrames progress $it" }},
		{ logv { "merging frames to create a video failed ${it.message}" }}, 
		{ logv { "video creation successfully completed" } }
	).addTo(subscription)

How to install

Step 1. Add the JitPack repository to your build file

Add it in your root build.gradle at the end of repositories:

allprojects {
	repositories {
		...
		maven { url 'https://dl.bintray.com/exozetag/maven' }
	}
}

Step 2. Add the dependency

dependencies {
	implementation 'com.exozet:transcoder:{version}'

	//Need to add ffmpeg dependencies if want to use FFMpegTranscoder(tested version 4.3.1.LTS)
	implementation 'com.arthenica:mobile-ffmpeg-full-gpl:{version}'
}

License

Copyright 2019 Exozet GmbH

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

Contributors

Jan Rabe

Ömür Kumru