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Vstitch.java
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Vstitch.java
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/*
* Copyright 2016-2018 the original author or authors.
*
* 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.
*/
package com.creactiviti.piper.taskhandler.media;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.Arrays;
import java.util.List;
import org.apache.commons.io.FileUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import com.creactiviti.piper.core.task.SimpleTaskExecution;
import com.creactiviti.piper.core.task.TaskExecution;
import com.creactiviti.piper.core.task.TaskHandler;
/**
* a {@link TaskHandler} implementation which "stitches" together a
* collection of <code>chunks</code> into a single file specified by
* the <code>output</code> property.
*
* @author Arik Cohen
* @since Jun 4, 2017
*/
@Component("media/vstitch")
class Vstitch implements TaskHandler<Object> {
private final Ffmpeg ffmpeg = new Ffmpeg();
private final Logger logger = LoggerFactory.getLogger(getClass());
@Override
public Object handle (TaskExecution aTask) throws Exception {
List<String> chunks = aTask.getList("chunks",String.class);
logger.debug("{}",chunks);
File tempFile = File.createTempFile("_chunks", ".txt");
try {
try (Writer writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(tempFile, true), "UTF-8"))) {
for(String chunk : chunks) {
writer.append(String.format("file '%s'", chunk))
.append("\n");
}
}
SimpleTaskExecution ffmpegTask = new SimpleTaskExecution();
List<String> options = Arrays.asList(
"-y",
"-f","concat",
"-safe","0",
"-i",tempFile.getAbsolutePath(),
"-c","copy",
aTask.getRequiredString("outputFile")
);
ffmpegTask.set("options", options);
ffmpeg.handle(ffmpegTask);
}
finally {
FileUtils.deleteQuietly(tempFile);
}
return null;
}
}