I'm thinking about coding a Java applet that would take in the top 100 or so songs, find their samples (music that appears within the songs) off WhoSampled.com and then playing those samples off of YouTube.
My problem is the playing part, let's say I have the URL. What's the best way to deal with that in Java, do you think ripping the audio off and playing the audio from there would be best, or should I try to control a sentient YouTube player.
I'm leaning towards extracting the audio, and this: thread mentions a way to extract that audio, however the code:
wget http://www.youtube.com/get_video.php?video_id=...
ffmpeg -i - audio.mp3
Is not written in Java. How do I, if possible convert this to run in a Java program? Or does anyone know a good way in Java
Thank you for your suggestions.
You can use an FFMPEG Java wrapper like this one https://github.com/bramp/ffmpeg-cli-wrapper/
An example can be found in Readme. Converting MP4 to mp3 should be like this:
FFmpeg ffmpeg = new FFmpeg("/path/to/ffmpeg");
FFprobe ffprobe = new FFprobe("/path/to/ffprobe");
FFmpegBuilder builder = new FFmpegBuilder()
.setInput("input.mp4") // Filename, or a FFmpegProbeResult
.overrideOutputFiles(true) // Override the output if it exists
.addOutput("output.mp3") // Filename for the destination
.setFormat("mp3") // Format is inferred from filename, or can be set
.setAudioCodec("aac") // using the aac codec
.setAudioSampleRate(48_000) // at 48KHz
.setAudioBitRate(32768) // at 32 kbit/s
.done();
FFmpegExecutor executor = new FFmpegExecutor(ffmpeg, ffprobe);
// Run a one-pass encode
executor.createJob(builder).run();
Related
I'm trying to access a RTSP video stream from an IP camera using OpenCV and Java. I can access the stream using VLC player with the following format: rtsp://192.168.1.10:554/rtsp_live0 but when I try to use OpenCV the video stream seems to always be closed.
The code I'm using... (simplified)
VideoCapture capture = new VideoCapture();
capture.open("rtsp://192.168.1.10:554/rtsp_live0");
while(!capture.isOpened())
System.out.print("Not opened :( \r");
I have a Mustcam H806P and found the stream URI from this website: http://www.ispyconnect.com/man.aspx?n=ipcamera
What am I doing wrong?
I'm reporting Alexander Smorkalov answer on answers.opencv.org
OpenCV uses ffmpeg library for video I/O. Try to get video stream with console ffmpeg tool. The address must be the same.
See also here OpenCV - how to capture rtsp video stream
I'm using VLCJ and I wish to save a video clip I'm playing using mediaPlayer.playMedia(); to my desktop. I know this can be accomplished by setting media options using a :sout string but I don't know which options to set and I'm having trouble understanding the example option strings on the web. Could someone help by explaining the following :sout option string?
String[] options = {":sout=#transcode{vcodec=mp4v,vb=4096,scale=1,acodec=mpga,ab=128,channels=2,samplerate=44100}:duplicate{dst=file{dst=" + fileName + "},dst=display}", ":input-slave=alsa://hw:0,0"};
I just need an options array that creates an mp4 video using the fileName destination. These options fail/error out for me.
Also, VLCJ seems to be dropping a ton of frames with this error
avcodec decoder error: more than 5 seconds of late video -> dropping frame
by using these options
String[] options = {":sout=#transcode{vcodec=mp1v,vb=2048,scale=1,acodec=mpga,ab=128,channels=2,samplerate=44100}:duplicate{dst=file{mux=mpeg1,dst=" + fileName + "},dst=display}", ":input-slave=dshow://hw:0,0" };
To save a raw stream, use media options similar to the following when you play the media:
String mrl = "your-streaming-mrl";
String[] opts = {"sout=#duplicate{dst=std{access=file,mux=raw,dst=output-file.ext}}"};
Clearly you replace "your-streaming-mrl" and "output-file.ext" with whatever is appropriate.
And then:
mediaPlayer.playMedia(mrl, opts);
You will need to wait (listen) for a media player "finished" event before your saved file is ready.
You may also need to explicitly invoke release() on the media player before your saved file is ready.
My goal
I want to do the following in Java: record some sound made by Java itself, and then save it as a wav file.
I've searched for a lot of these kind of programs online, and I've found some good ones, but I get the same problem again and again (the current version can be found here). The problem is always something like this:
In the public class, the function start begins with
AudioFormat format = getAudioFormat();
DataLine.Info info = new DataLine.Info(TargetDataLine.class, format);
if (!AudioSystem.isLineSupported(info)) {
System.out.println("Line not supported");
System.exit(0);
}
, where getAudioFormat() returns AudioFormat(16000,8,2,true,true). If I run the file, it prints Line not supported, but why?
What I've tried:
I've searched for loads of different formats online, and tried each of them.
I've taken an existing wav file which Java can play, taken the format of that one, and used it as the format for the file I try to create.
Some more information:
System.out.println(AudioSystem.getTargetLineInfo(info));
System.out.println(AudioSystem.getAudioFileTypes());
System.out.println(AudioSystem.getMixerInfo());
System.out.println(AudioSystem.getSourceDataLine(format));
where format is the format of the existing wav file, and info is defined as in the first code snippet, prints:
[Ljavax.sound.sampled.Line$Info;#4eec7777
[Ljavax.sound.sampled.AudioFileFormat$Type;#41629346
[Ljavax.sound.sampled.Mixer$Info;#6d311334
com.sun.media.sound.DirectAudioDevice$DirectSDL#448139f0
I use Windows 7, 64 bits.
I'd like to add that if there's a better, entirely different way to achieve my goal, that's fine too.
I am trying to program a classroom assistant (I work as a teacher) using Java who will give spoken instructions to students/ask them questions etc. I have managed to connect successfully to the cerevoice cloud to create an ogg file
e.g. "https://cerevoice.s3.amazonaws.com/Heather220501c8c2e94d4650f64f7d951bf76b08b0eb.ogg"
however when I try to play this ogg file from java I get an error that it could not be found or that it is an unsupported audio resource depending on the ogg player I use (i have tried EasyOGG and TinySound so far) - both the ogg players work successfully locally but I cannot get them to play a file directly from the website.
Examples how I have tried to reference it:
URL url = new URL("https://cerevoice.s3.amazonaws.com/Heather220501c8c2e94d4650f64f7d951bf76b08b0eb.ogg");
Music song = TinySound.loadMusic(url);
song.play(true);
OggClip ogg = new OggClip("https://cerevoice.s3.amazonaws.com/Heather220501c8c2e94d4650f64f7d951bf76b08b0eb.ogg");
ogg.loop();
Apologies for my ignorance I'd really appreciate any help anyone can give with playing this file! =)
Many thanks,
Darren
Edited to show using a literal String value to help clarity
Edit very ugly hack 1 solution: //opens a browser window plays file then closes window
String url = "https://cerevoice.s3.amazonaws.com/Heather220501c8c2e94d4650f64f7d951bf76b08b0eb.ogg"; //hard coded here for simplicity but URL dynamically retrieved from webservice
java.awt.Desktop.getDesktop().browse(java.net.URI.create(url));
Thread.sleep(3000);
Runtime.getRuntime().exec("taskkill /F /IM chrome.exe");
Edit slightly less ugly hack 2 solution:
//creation of a temporary file to allow playing from java without creating a browser window
try{
Files.deleteIfExists(Paths.get("C:/cere/temp.ogg"));
try (InputStream in = URI.create(url.value).toURL().openStream()) {
Files.copy(in, Paths.get("C:/cere/temp.ogg"));
}catch(IOException e) {
}
I am trying to store a rtsp stream to file using vlcj.
I've done a couple of tutorials, looked at some of their test projects but haven't been able to do this.
Any ideas? Thanks in advance!
EDIT
Found an An example of transcoding and saving video from a capture device. Trying to get it to work. Looking for some documentation on the "options" part in mediaPlayer.playMedia(mrl, options);.
Someone answered me on the video lan forums, check it out.
My relevant code is below, where the most important part is the additional option for the vlc media player ":file{dst=C:/Users/the man/yahoo.mp4}".
mFactory = new MediaPlayerFactory();
mPlayer = mFactory.newHeadlessMediaPlayer();
String mrl = "rtsp://#" + addressStr + ":" + mPhoneRTSPPort;
String options = ":sout=#transcode{vcodec=h264,venc=x264{cfr=16},scale=1,acodec=mp4a,ab=160,channels=2,samplerate=44100}"
+ ":file{dst=C:/Users/the man/yahoo.mp4}";
mPlayer.playMedia(mrl, options);