/// <summary>
/// Extract the video clip.
/// </summary>
private void btnExtract_Click(object sender, EventArgs e)
{
try
{
// Check parameters ...
string sourceAudioFile = this.player.URL;
if (string.IsNullOrEmpty(sourceAudioFile))
{
throw new ArgumentException("Please choose the source audio file");
}
string outputDirectory = this.tbOutputDirectory.Text;
if (string.IsNullOrEmpty(outputDirectory))
{
throw new ArgumentException("Please specify the output directory");
}
string startpoint = this.tbStartpoint.Text;
if (string.IsNullOrEmpty(tbStartpoint.Text))
{
throw new ArgumentException("Please specify the startpoint of the audio clip");
}
string endpoint = this.tbEndpoint.Text;
if (string.IsNullOrEmpty(endpoint))
{
throw new ArgumentException("Please specify the endpoint of the audio clip");
}
// Extract the audio file.
OutputAudioType outputType = (OutputAudioType)this.cmbOutputAudioType.SelectedValue;
string outputFileName = ExpressionEncoderWrapper.ExtractAudio(
sourceAudioFile, outputDirectory, outputType,
Double.Parse(startpoint), Double.Parse(endpoint));
MessageBox.Show("Audio file is successfully extracted: " + outputFileName);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error");
}
}
/// <summary>
/// Extract audio file.
/// </summary>
/// <param name="sourceAudioFile">The full path of the source audio file</param>
/// <param name="outputDirectory">The output directory</param>
/// <param name="outputAudioType">Output audio format (.mp4/.wma)</param>
/// <param name="startpoint">
/// The extracting startpoint in the source audio file in milliseconds
/// </param>
/// <param name="endpoint">
/// The extracting endpoint in the source audio file in milliseconds
/// </param>
/// <returns>The full path of the output file name</returns>
public static string ExtractAudio(string sourceAudioFile, string outputDirectory,
OutputAudioType outputAudioType, double startpoint, double endpoint)
{
using (Job job = new Job())
{
MediaItem src = new MediaItem(sourceAudioFile);
switch (outputAudioType)
{
case OutputAudioType.MP4:
src.OutputFormat = new MP4OutputFormat();
src.OutputFormat.AudioProfile = new AacAudioProfile();
src.OutputFormat.AudioProfile.Codec = AudioCodec.AAC;
src.OutputFormat.AudioProfile.BitsPerSample = 24;
break;
case OutputAudioType.WMA:
src.OutputFormat = new WindowsMediaOutputFormat();
src.OutputFormat.AudioProfile = new WmaAudioProfile();
src.OutputFormat.AudioProfile.Bitrate = new VariableConstrainedBitrate(128, 192);
src.OutputFormat.AudioProfile.Codec = AudioCodec.WmaProfessional;
src.OutputFormat.AudioProfile.BitsPerSample = 24;
break;
}
TimeSpan spanStart = TimeSpan.FromMilliseconds(startpoint);
src.Sources[0].Clips[0].StartTime = spanStart;
TimeSpan spanEnd = TimeSpan.FromMilliseconds(endpoint);
src.Sources[0].Clips[0].EndTime = spanEnd;
job.MediaItems.Add(src);
job.OutputDirectory = outputDirectory;
job.Encode();
return(job.MediaItems[0].ActualOutputFileFullPath);
}
}
