/// <summary>
/// Take a snapshot of a video at the provided time.
/// </summary>
public static void takeSnapshotFromVideo(string inFile, DateTime snapTime, ImageSize size, ImageCrop crop, string outFile)
{
string startTimeArg = UtilsVideo.formatStartTimeArg(snapTime);
string videoSizeArg = UtilsVideo.formatVideoSizeArg(inFile, size, crop, 2, 2);
string cropArg = UtilsVideo.formatCropArg(inFile, size, crop);
string ffmpegSnapshotProgArgs = "";
// Example format:
// -y -an -ss 00:03:33.370 -i "G:\Temp\input.mkv" -s 358x202 -f image2 -vf crop=358:202:0:0 -vframes 1 "output.jpg"
ffmpegSnapshotProgArgs = String.Format("-y -an {0} -i \"{1}\" -f image2 -vf \"{2}, {3}\" -vframes 1 \"{4}\"",
// Time to take snapshot at
startTimeArg, // {0}
// Filename
inFile, // {1}
// Filters
videoSizeArg, // {2}
cropArg, // {3}
// Output name
outFile); // {4}
UtilsCommon.startFFmpeg(ffmpegSnapshotProgArgs, false, true);
}
/// <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);
}
/// <summary>
/// Take a snapshot of a video at the provided time.
/// </summary>
public static void takeSnapshotFromVideo(string inFile, DateTime snapTime, ImageSize size, ImageCrop crop,
string outFile)
{
string startTimeArg = UtilsVideo.formatStartTimeArg(snapTime);
string videoSizeArg = UtilsVideo.formatVideoSizeArg(inFile, size, crop, 2, 2);
string cropArg = UtilsVideo.formatCropArg(inFile, size, crop);
string ffmpegSnapshotProgArgs = "";
// Example format:
// -y -an -ss 00:03:33.370 -i "G:\Temp\input.mkv" -s 358x202 -f image2 -vf crop=358:202:0:0 -vframes 1 "output.jpg"
ffmpegSnapshotProgArgs =
$"-y -an {startTimeArg} -i \"{inFile}\" -f image2 -vf \"{videoSizeArg}, {cropArg}\" -vframes 1 \"{outFile}\""; // {4}
UtilsCommon.startFFmpeg(ffmpegSnapshotProgArgs, false, true);
}
