/// <summary>
/// Extract a video clip from a longer video clip without re-encoding.
/// </summary>
public static void cutVideo(string inFile, DateTime startTime, DateTime endTime, string outFile)
{
string startTimeArg = UtilsVideo.formatStartTimeArg(startTime);
string durationArg = UtilsVideo.formatDurationArg(startTime, endTime);
string timeArg = formatStartTimeAndDurationArg(startTime, endTime);
string ffmpegCutArgs = "";
// Example format:
// -y -i -ss 00:00:00.000 -t "input.avi" -t 00:00:01.900 -c copy "output.avi"
// Note: The order of the arguments is strange, but unless -ss comes before -i,
// the video will SOMETIMES fail to copy and the output will consist
// of only the audio. Lots of experimentation involved.
ffmpegCutArgs = String.Format("-y {0} -i \"{1}\" {2} -c copy \"{3}\"",
// Start time
startTimeArg, // {0}
// Input video file name
inFile, // {1}
// Duration
durationArg, // {2}
// Output video file name
outFile); // {3}
UtilsCommon.startFFmpeg(ffmpegCutArgs, false, true);
}
/// <summary>
/// Format a start time and duration argument for ffmpeg.
/// </summary>
public static string formatStartTimeAndDurationArg(DateTime startTime, DateTime endTime)
{
string startTimeArg = UtilsVideo.formatStartTimeArg(startTime);
string durationArg = UtilsVideo.formatDurationArg(startTime, endTime);
DateTime diffTime = UtilsSubs.getDurationTime(startTime, endTime);
// Example: -ss 00:00:07.920 -t 00:24:35.120
string timeArg = String.Format("{0} {1}",
startTimeArg, // {0}
durationArg); // {1}
return(timeArg);
}
