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.
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