Getting the duration from video stream

[ryan]

Hi, I am trying to get the duration of a video from the container
using java. The problem is that I keep getting the default value of a
large negative number for the duration time (-923423...........)
instead of the time in millseconds. My code is below, can anyone help
me in getting the duration time? Thanks in advance

if (container.open(thefile.getStream(), null) < 0){
// Message: "could not open file"
throw new HeliosBusinessException(new
HeliosMessage("error.CouldNotOpenFile", this.getName()));
}

int numStreams = container.getNumStreams();

for(int i = 0; i < numStreams; i++){

IStream stream = container.getStream(i);
IStreamCoder coder = stream.getStreamCoder();
long dur = container.getDuration();
stream.getDuration();

//The stream and the container both bring back
this large negative number

// Get Video information
if (coder.getCodecType() == ICodec.Type.CODEC_TYPE_VIDEO){
String durationInUse = "Duration In Use: " + (stream.getDuration()
== Global.NO_PTS ? "unknown" : "" + stream.getDuration());

[Dilip Shah]

Ryan,

The following function works for me:
/**
* Fetches a video's duration in microseconds.
*
* @param videoFile
* @return
*/
public long getVideoDuration(String videoFile) {
// Create a Xuggler container object
IContainer container = IContainer.make();

// Open up the container
if (container.open(videoFile, IContainer.Type.READ, null) < 0) {
throw new IllegalArgumentException("Could not open file: " + videoFile);
}

return container.getDuration();
}

Dilip

--------------------------------------------------
From: "ryan" <sean...@gmail.com>
Sent: Saturday, May 29, 2010 5:10 AM
To: "xuggler-users" <xuggle...@googlegroups.com>
Subject: [xuggler-users] Getting the duration from video stream

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[Sean Ryan]

My code takes a DataInput stream instead of the String videofile. It
works with the String videofile but not for a DataInput stream:

(container.open(thefile.getStream(),null) < 0){

Sent from my iPhone

On 30 May 2010, at 05:50 p.m., "Dilip Shah" <dilip...@hotmail.com>
wrote:

[Sean Ryan]

Hi,

  So does anyone know exactly why when I try to use an InputStream to access the container that I can't get the duration time of a video?

// Uses (InputStream input, IContainerFormat format)
if (container.open(thefile.getStream(), null) < 0){
    throw new IllegalArgumentException("could not open file: " + filename);
}

// Value is large negative number instead of time in milliseconds
container.getDuration();

Thanks,

Ryan

[Art Clarke]

I do.  First search the lists for the reasons why (I believe I've answered this sometime last year) but duration calculation isn't as simple as it appears.

To try to get the most reliable estimate of duration, FFmpeg seeks to the end of file and back when a container doesn't report duration some other way.  In the case of an InputStream, you can't seek ahead, so we can't guess duration.

- Art

http://www.xuggle.com/
xu‧ggle (zŭ' gl) v. To freely encode, decode, and experience audio and video.

Use Xuggle to get the power of FFmpeg in Java.