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determine interlaced from ffprobe data

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This commit is contained in:
Luke Pulverenti 2017-03-26 00:20:00 -04:00
parent 68c8792946
commit abc54d1ea3
3 changed files with 10 additions and 159 deletions
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162
MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs
View File

@ -647,9 +647,9 @@ namespace MediaBrowser.MediaEncoding.Encoder
var videoStream = mediaInfo.MediaStreams.FirstOrDefault(i => i.Type == MediaStreamType.Video);
if (videoStream != null)
if (videoStream != null && !videoStream.IsInterlaced)
{
var isInterlaced = await DetectInterlaced(mediaInfo, videoStream, inputPath, probeSizeArgument).ConfigureAwait(false);
var isInterlaced = DetectInterlaced(mediaInfo, videoStream);
if (isInterlaced)
{
@ -672,7 +672,7 @@ namespace MediaBrowser.MediaEncoding.Encoder
}
}
private async Task<bool> DetectInterlaced(MediaSourceInfo video, MediaStream videoStream, string inputPath, string probeSizeArgument)
private bool DetectInterlaced(MediaSourceInfo video, MediaStream videoStream)
{
var formats = (video.Container ?? string.Empty).Split(',').ToList();
var enableInterlacedDection = formats.Contains("vob", StringComparer.OrdinalIgnoreCase) ||
@ -698,165 +698,9 @@ namespace MediaBrowser.MediaEncoding.Encoder
}
}
if (video.Protocol != MediaProtocol.File)
{
return false;
}
var args = "{0} -i {1} -map 0:v:{2} -an -filter:v idet -frames:v 500 -an -f null /dev/null";
var process = _processFactory.Create(new ProcessOptions
{
CreateNoWindow = true,
UseShellExecute = false,
// Must consume both or ffmpeg may hang due to deadlocks. See comments below.
RedirectStandardError = true,
FileName = FFMpegPath,
Arguments = string.Format(args, probeSizeArgument, inputPath, videoStream.Index.ToString(CultureInfo.InvariantCulture)).Trim(),
IsHidden = true,
ErrorDialog = false,
EnableRaisingEvents = true
});
_logger.Debug("{0} {1}", process.StartInfo.FileName, process.StartInfo.Arguments);
var idetFoundInterlaced = false;
using (var processWrapper = new ProcessWrapper(process, this, _logger))
{
try
{
StartProcess(processWrapper);
}
catch (Exception ex)
{
_logger.ErrorException("Error starting ffprobe", ex);
throw;
}
try
{
//process.BeginOutputReadLine();
using (var reader = new StreamReader(process.StandardError.BaseStream))
{
while (!reader.EndOfStream)
{
var line = await reader.ReadLineAsync().ConfigureAwait(false);
if (line.StartsWith("[Parsed_idet", StringComparison.OrdinalIgnoreCase))
{
var idetResult = AnalyzeIdetResult(line);
if (idetResult.HasValue)
{
if (!idetResult.Value)
{
return false;
}
idetFoundInterlaced = true;
}
}
}
}
}
catch
{
StopProcess(processWrapper, 100);
throw;
}
}
return idetFoundInterlaced;
}
private bool? AnalyzeIdetResult(string line)
{
// As you can see, the filter only guessed one frame as progressive.
// Results like this are pretty typical. So if less than 30% of the detections are in the "Undetermined" category, then I only consider the video to be interlaced if at least 65% of the identified frames are in either the TFF or BFF category.
// In this case (310 + 311)/(622) = 99.8% which is well over the 65% metric. I may refine that number with more testing but I honestly do not believe I will need to.
// http://awel.domblogger.net/videoTranscode/interlace.html
var index = line.IndexOf("detection:", StringComparison.OrdinalIgnoreCase);
if (index == -1)
{
return null;
}
line = line.Substring(index).Trim();
var parts = line.Split(' ').Where(i => !string.IsNullOrWhiteSpace(i)).Select(i => i.Trim()).ToList();
if (parts.Count < 2)
{
return null;
}
double tff = 0;
double bff = 0;
double progressive = 0;
double undetermined = 0;
double total = 0;
for (var i = 0; i < parts.Count - 1; i++)
{
var part = parts[i];
if (string.Equals(part, "tff:", StringComparison.OrdinalIgnoreCase))
{
tff = GetNextPart(parts, i);
total += tff;
}
else if (string.Equals(part, "bff:", StringComparison.OrdinalIgnoreCase))
{
bff = GetNextPart(parts, i);
total += tff;
}
else if (string.Equals(part, "progressive:", StringComparison.OrdinalIgnoreCase))
{
progressive = GetNextPart(parts, i);
total += progressive;
}
else if (string.Equals(part, "undetermined:", StringComparison.OrdinalIgnoreCase))
{
undetermined = GetNextPart(parts, i);
total += undetermined;
}
}
if (total == 0)
{
return null;
}
if ((undetermined / total) >= .3)
{
return false;
}
if (((tff + bff) / total) >= .4)
{
return true;
}
return false;
}
private int GetNextPart(List<string> parts, int index)
{
var next = parts[index + 1];
int value;
if (int.TryParse(next, NumberStyles.Any, CultureInfo.InvariantCulture, out value))
{
return value;
}
return 0;
}
/// <summary>
/// The us culture
/// </summary>

2
MediaBrowser.MediaEncoding/Probing/InternalMediaInfoResult.cs
View File

@ -264,6 +264,8 @@ namespace MediaBrowser.MediaEncoding.Probing
/// <value>The loro_surmixlev.</value>
public string loro_surmixlev { get; set; }
public string field_order { get; set; }
/// <summary>
/// Gets or sets the disposition.
/// </summary>

5
MediaBrowser.MediaEncoding/Probing/ProbeResultNormalizer.cs
View File

@ -508,6 +508,11 @@ namespace MediaBrowser.MediaEncoding.Probing
stream.IsAVC = false;
}
if (!string.IsNullOrWhiteSpace(streamInfo.field_order) && !string.Equals(streamInfo.field_order, "progressive", StringComparison.OrdinalIgnoreCase))
{
stream.IsInterlaced = true;
}
// Filter out junk
if (!string.IsNullOrWhiteSpace(streamInfo.codec_tag_string) && streamInfo.codec_tag_string.IndexOf("[0]", StringComparison.OrdinalIgnoreCase) == -1)
{