private static async Task convertAudio(IStream audioStream, string outputFilePath)
{
var conv = new Conversion();
conv.AddStream(audioStream);
conv.SetOutput(outputFilePath);
//constant bitrate needed to stop song length from doubling incorrectly - FFMpeg bug
//see here https://superuser.com/questions/892996/ffmpeg-is-doubling-audio-length-when-extracting-from-video/893044
//128k seems to be typical youtube audio quality - won't increase file size
conv.SetAudioBitrate("128k");
await conv.Start(); //wait for conversion to finish;
}
async private void CutGif(int from, int to, String filePath, String[] additionalFilter = null, bool subtitles = false, bool fullResolution = false, bool keepAudio = false)
{
if (from > to)
{
int t = from;
from = to;
to = t;
}
if (from == to)
{
ShowMessage(MessageType.Warning, "Start and end markers have same position");
return;
}
if (TimeSpan.FromMilliseconds(to - from) > TimeSpan.FromMinutes(kWarningTresholdMin))
{
if (MessageBox.Show("You selected timespan longer than 5 minutes. Do you want proceed?", "Gifer", MessageBoxButtons.YesNo) != DialogResult.Yes)
{
return;
}
}
var subpath = Path.ChangeExtension(Path.GetTempFileName(), "ass");
var escapedPath = subpath.Replace("\\", "\\\\").Replace(":", "\\:").Replace("[", "\\[").Replace("]", "\\]");
var mediaInfo = await FFmpeg.GetMediaInfo(filePath);
bool isDVDsubs = false;
if (subtitles)
{
if (selectedSubtitle == null)
{
selectedSubtitle = mediaInfo.SubtitleStreams.First();
}
if (selectedSubtitle.Codec == "dvd_subtitle")
{
isDVDsubs = true;
}
else
{
var subconv = FFmpeg.Conversions.New().AddStream(selectedSubtitle).SetOutput(subpath);
WriteToLog(subconv.Build());
await subconv.Start();
}
}
var videoStream = mediaInfo.VideoStreams.First();
var fileName = Path.GetFileNameWithoutExtension(filePath);
var resultName = fileName + "_" + from + "_" + to + ".mp4";
var videoPath = Environment.GetFolderPath(Environment.SpecialFolder.MyVideos);
var resultPath = Path.Combine(videoPath, resultName);
var resizeVf = "scale=iw*sar:ih, scale='min(800,ceil(iw/2)*2)':-2";
var roundVf = "pad=ceil(iw/2)*2:ceil(ih/2)*2";
var subtitlesVf = FormattableString.Invariant($"subtitles='{escapedPath}':original_size={videoStream.Width}x{videoStream.Height}:force_style='FontName=Open Sans Semibold,PrimaryColour=&H00FFFFFF,Bold=1,ScaleX={Configuration.SubtitlesScale:F1},ScaleY={Configuration.SubtitlesScale:F1}'");
var vfs = new List <String>();
if (additionalFilter != null)
{
vfs.AddRange(additionalFilter);
}
if (!fullResolution)
{
vfs.Add(resizeVf);
}
else
{
vfs.Add(roundVf);
}
if (subtitles)
{
if (isDVDsubs)
{
var dvdSubsVf = FormattableString.Invariant($"scale[vidi];[sub][vidi]scale2ref[subrs][vidio];[vidio][subrs]overlay;[0:{selectedSubtitle.Index}]fps=fps={videoStream.Framerate}[sub]");
vfs.Add(dvdSubsVf);
}
else
{
vfs.Add(subtitlesVf);
}
}
var crf = Configuration.CRF;
var conv = new Conversion().AddStream(videoStream).AddParameter($"-ss {from}ms -to {to}ms -copyts", ParameterPosition.PreInput)
.SetPixelFormat(PixelFormat.yuv420p)
.AddParameter($"-filter_complex \"[0:v]{BuildVF(vfs)}\" -map -0:s -c:v libx264 -crf {crf} -profile:v baseline -ss {from}ms")
.SetOutput(resultPath).SetOverwriteOutput(true);
if (keepAudio)
{
if (selectedAudio == null)
{
selectedAudio = mediaInfo.AudioStreams.First();
}
conv = conv.AddStream(selectedAudio);
}
if (isDVDsubs)
{
conv = conv.AddStream(selectedSubtitle);
}
WriteToLog(conv.Build());
try {
var convProcess = await conv.Start();
}
catch (Exception ex) {
WriteToLog(ex.ToString());
ShowMessage(MessageType.Error, "Building gif failed");
return;
}
ShowMessage(MessageType.Success, "Finished building gif");
StringCollection resultList = new StringCollection {
resultPath
};
Clipboard.SetFileDropList(resultList);
if (subtitles)
{
File.Delete(subpath);
}
}