59 lines
2.6 KiB
Java
59 lines
2.6 KiB
Java
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package org.jcodec.movtool;
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import java.io.File;
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import org.jcodec.common.logging.Logger;
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import org.jcodec.common.model.RationalLarge;
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import org.jcodec.common.tools.MainUtils;
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import org.jcodec.containers.mp4.boxes.MovieBox;
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import org.jcodec.containers.mp4.boxes.MovieFragmentBox;
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import org.jcodec.containers.mp4.boxes.TimeToSampleBox;
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import org.jcodec.containers.mp4.boxes.TrakBox;
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public class SetFPS {
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private static final int MIN_TIMESCALE_ALLOWED = 25;
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public static void main1(String[] args) throws Exception {
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MainUtils.Cmd cmd = MainUtils.parseArguments(args, new MainUtils.Flag[0]);
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if (cmd.argsLength() < 2) {
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MainUtils.printHelpNoFlags("movie", "num:den");
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System.exit(-1);
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}
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final RationalLarge newFPS = RationalLarge.parse(cmd.getArg(1));
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new InplaceMP4Editor().modify(new File(cmd.getArg(0)), new MP4Edit() {
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public void apply(MovieBox mov) {
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TrakBox vt = mov.getVideoTrack();
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TimeToSampleBox stts = vt.getStts();
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TimeToSampleBox.TimeToSampleEntry[] entries = stts.getEntries();
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long nSamples = 0L;
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long totalDuration = 0L;
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for (TimeToSampleBox.TimeToSampleEntry e : entries) {
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nSamples += (long)e.getSampleCount();
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totalDuration += (long)(e.getSampleCount() * e.getSampleDuration());
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}
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int newTimescale = (int)newFPS.multiply(new RationalLarge(totalDuration, nSamples)).scalarClip();
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if (newTimescale >= 25) {
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vt.setTimescale(newTimescale);
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} else {
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double mul = new RationalLarge((long)vt.getTimescale() * totalDuration, nSamples).divideBy(newFPS)
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.scalar();
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Logger.info("Applying multiplier to sample durations: " + mul);
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for (TimeToSampleBox.TimeToSampleEntry e : entries)
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e.setSampleDuration((int)((double)e.getSampleDuration() * mul * 100.0D));
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vt.setTimescale(vt.getTimescale() * 100);
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}
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if (newTimescale != vt.getTimescale()) {
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Logger.info("Changing timescale to: " + vt.getTimescale());
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long newDuration = totalDuration * (long)mov.getTimescale() / (long)vt.getTimescale();
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mov.setDuration(newDuration);
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vt.setDuration(newDuration);
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} else {
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Logger.info("Already at " + newFPS.toString() + "fps, not changing.");
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}
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}
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public void applyToFragment(MovieBox mov, MovieFragmentBox[] fragmentBox) {
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throw new RuntimeException("Unsupported");
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}
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});
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}
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}
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