private Slide[] BuildThumbnailsUnix(ConversionConfiguration config, string slidesFileName)
{
var thumbOutDir = Path.Combine(config.OutputDirectory, "thumbs");
Directory.CreateDirectory(thumbOutDir);
List <Slide> result = new List <Slide>();
try
{
dynamic projectJson = JsonConvert.DeserializeObject(File.ReadAllText(config.MetadataPath));
int currentId = 0;
var keyframes = new List <TimeSpan>();
keyframes.Add(TimeSpan.Zero);
foreach (string timestamp in projectJson["slides"])
{
keyframes.Add(TimeSpan.Parse(timestamp));
}
foreach (var keyframe in keyframes)
{
TimeSpan?nextKeyframe = null;
if (keyframes.IndexOf(keyframe) != keyframes.Count - 1)
{
nextKeyframe = keyframes[keyframes.IndexOf(keyframe) + 1];
}
else
{
nextKeyframe = FFmpegHelper.GetMediaLength(config.SlideVideoPath);
}
string thumbName = FFmpegHelper.ExportThumbnail((float)nextKeyframe.GetValueOrDefault().TotalSeconds - 2.0f, config.SlideVideoPath, thumbOutDir,
(currentId++).ToString());
var tmpFileName = Path.Combine("/tmp", Path.GetRandomFileName());
var process = FFmpegHelper.BuildProcess("tesseract", Path.Combine(thumbOutDir, thumbName) + " \"" + tmpFileName + "\"", false);
process.Start();
process.WaitForExit();
var ocr = File.ReadAllText(tmpFileName + ".txt");
File.Delete(tmpFileName + ".txt");
var slide = new Slide
{
StartPosition = (float)keyframe.TotalSeconds + 0.2f,
Thumbnail = "thumbs/" + thumbName,
Ocr = ocr
};
if (keyframe.Equals(TimeSpan.Zero))
{
slide.StartPosition = 0.0f;
}
result.Add(slide);
}
}
catch (Exception ex)
{
_logger.LogError(ex.Message);
}
return(result.ToArray());
}