private async Task<Stream> ExtractImageInternal(string inputPath, MediaProtocol protocol, Video3DFormat? threedFormat, TimeSpan? offset, bool useIFrame, SemaphoreSlim resourcePool, CancellationToken cancellationToken)
{
if (string.IsNullOrEmpty(inputPath))
{
throw new ArgumentNullException("inputPath");
}
// apply some filters to thumbnail extracted below (below) crop any black lines that we made and get the correct ar then scale to width 600.
// This filter chain may have adverse effects on recorded tv thumbnails if ar changes during presentation ex. commercials @ diff ar
var vf = "scale=600:trunc(600/dar/2)*2";
if (threedFormat.HasValue)
{
switch (threedFormat.Value)
{
case Video3DFormat.HalfSideBySide:
vf = "crop=iw/2:ih:0:0,scale=(iw*2):ih,setdar=dar=a,crop=min(iw\\,ih*dar):min(ih\\,iw/dar):(iw-min(iw\\,iw*sar))/2:(ih - min (ih\\,ih/sar))/2,setsar=sar=1,scale=600:trunc(600/dar/2)*2";
// hsbs crop width in half,scale to correct size, set the display aspect,crop out any black bars we may have made the scale width to 600. Work out the correct height based on the display aspect it will maintain the aspect where -1 in this case (3d) may not.
break;
case Video3DFormat.FullSideBySide:
vf = "crop=iw/2:ih:0:0,setdar=dar=a,crop=min(iw\\,ih*dar):min(ih\\,iw/dar):(iw-min(iw\\,iw*sar))/2:(ih - min (ih\\,ih/sar))/2,setsar=sar=1,scale=600:trunc(600/dar/2)*2";
//fsbs crop width in half,set the display aspect,crop out any black bars we may have made the scale width to 600.
break;
case Video3DFormat.HalfTopAndBottom:
vf = "crop=iw:ih/2:0:0,scale=(iw*2):ih),setdar=dar=a,crop=min(iw\\,ih*dar):min(ih\\,iw/dar):(iw-min(iw\\,iw*sar))/2:(ih - min (ih\\,ih/sar))/2,setsar=sar=1,scale=600:trunc(600/dar/2)*2";
//htab crop heigh in half,scale to correct size, set the display aspect,crop out any black bars we may have made the scale width to 600
break;
case Video3DFormat.FullTopAndBottom:
vf = "crop=iw:ih/2:0:0,setdar=dar=a,crop=min(iw\\,ih*dar):min(ih\\,iw/dar):(iw-min(iw\\,iw*sar))/2:(ih - min (ih\\,ih/sar))/2,setsar=sar=1,scale=600:trunc(600/dar/2)*2";
// ftab crop heigt in half, set the display aspect,crop out any black bars we may have made the scale width to 600
break;
}
}
// TODO: Output in webp for smaller sizes
// -f image2 -f webp
// Use ffmpeg to sample 100 (we can drop this if required using thumbnail=50 for 50 frames) frames and pick the best thumbnail. Have a fall back just in case.
var args = useIFrame ? string.Format("-i {0} -threads 0 -v quiet -vframes 1 -vf \"{2},thumbnail=30\" -f image2 \"{1}\"", inputPath, "-", vf) :
string.Format("-i {0} -threads 0 -v quiet -vframes 1 -vf \"{2}\" -f image2 \"{1}\"", inputPath, "-", vf);
var probeSize = GetProbeSizeArgument(new[] { inputPath }, protocol);
if (!string.IsNullOrEmpty(probeSize))
{
args = probeSize + " " + args;
}
if (offset.HasValue)
{
args = string.Format("-ss {0} ", GetTimeParameter(offset.Value)) + args;
}
var process = new Process
{
StartInfo = new ProcessStartInfo
{
CreateNoWindow = true,
UseShellExecute = false,
FileName = FFMpegPath,
Arguments = args,
WindowStyle = ProcessWindowStyle.Hidden,
ErrorDialog = false,
RedirectStandardOutput = true,
RedirectStandardError = true,
RedirectStandardInput = true
}
};
await resourcePool.WaitAsync(cancellationToken).ConfigureAwait(false);
process.Start();
var memoryStream = new MemoryStream();
#pragma warning disable 4014
// Important - don't await the log task or we won't be able to kill ffmpeg when the user stops playback
process.StandardOutput.BaseStream.CopyToAsync(memoryStream);
#pragma warning restore 4014
// MUST read both stdout and stderr asynchronously or a deadlock may occurr
process.BeginErrorReadLine();
var ranToCompletion = process.WaitForExit(10000);
if (!ranToCompletion)
{
try
{
_logger.Info("Killing ffmpeg process");
process.StandardInput.WriteLine("q");
process.WaitForExit(1000);
}
catch (Exception ex)
{
_logger.ErrorException("Error killing process", ex);
}
}
//.........这里部分代码省略.........
public async Task ExtractVideoImagesOnInterval(string[] inputFiles,
MediaProtocol protocol,
Video3DFormat? threedFormat,
TimeSpan interval,
string targetDirectory,
string filenamePrefix,
int? maxWidth,
CancellationToken cancellationToken)
{
var resourcePool = _thumbnailResourcePool;
var inputArgument = GetInputArgument(inputFiles, protocol);
var vf = "fps=fps=1/" + interval.TotalSeconds.ToString(UsCulture);
if (maxWidth.HasValue)
{
var maxWidthParam = maxWidth.Value.ToString(UsCulture);
vf += string.Format(",scale=min(iw\\,{0}):trunc(ow/dar/2)*2", maxWidthParam);
}
FileSystem.CreateDirectory(targetDirectory);
var outputPath = Path.Combine(targetDirectory, filenamePrefix + "%05d.jpg");
var args = string.Format("-i {0} -threads 1 -v quiet -vf \"{2}\" -f image2 \"{1}\"", inputArgument, outputPath, vf);
var probeSize = GetProbeSizeArgument(new[] { inputArgument }, protocol);
if (!string.IsNullOrEmpty(probeSize))
{
args = probeSize + " " + args;
}
var process = new Process
{
StartInfo = new ProcessStartInfo
{
CreateNoWindow = true,
UseShellExecute = false,
FileName = FFMpegPath,
Arguments = args,
WindowStyle = ProcessWindowStyle.Hidden,
ErrorDialog = false,
RedirectStandardInput = true
}
};
_logger.Info(process.StartInfo.FileName + " " + process.StartInfo.Arguments);
await resourcePool.WaitAsync(cancellationToken).ConfigureAwait(false);
bool ranToCompletion = false;
using (var processWrapper = new ProcessWrapper(process, this, _logger))
{
try
{
StartProcess(processWrapper);
// Need to give ffmpeg enough time to make all the thumbnails, which could be a while,
// but we still need to detect if the process hangs.
// Making the assumption that as long as new jpegs are showing up, everything is good.
bool isResponsive = true;
int lastCount = 0;
while (isResponsive)
{
if (process.WaitForExit(30000))
{
ranToCompletion = true;
break;
}
cancellationToken.ThrowIfCancellationRequested();
var jpegCount = Directory.GetFiles(targetDirectory)
.Count(i => string.Equals(Path.GetExtension(i), ".jpg", StringComparison.OrdinalIgnoreCase));
isResponsive = (jpegCount > lastCount);
lastCount = jpegCount;
}
if (!ranToCompletion)
{
StopProcess(processWrapper, 1000, false);
}
}
finally
{
resourcePool.Release();
}
var exitCode = ranToCompletion ? processWrapper.ExitCode ?? 0 : -1;
if (exitCode == -1)
{
var msg = string.Format("ffmpeg image extraction failed for {0}", inputArgument);
//.........这里部分代码省略.........
private async Task<string> ExtractImageInternal(string inputPath, int? imageStreamIndex, MediaProtocol protocol, Video3DFormat? threedFormat, TimeSpan? offset, bool useIFrame, SemaphoreSlim resourcePool, CancellationToken cancellationToken)
{
if (string.IsNullOrEmpty(inputPath))
{
throw new ArgumentNullException("inputPath");
}
var tempExtractPath = Path.Combine(ConfigurationManager.ApplicationPaths.TempDirectory, Guid.NewGuid() + ".jpg");
Directory.CreateDirectory(Path.GetDirectoryName(tempExtractPath));
// apply some filters to thumbnail extracted below (below) crop any black lines that we made and get the correct ar then scale to width 600.
// This filter chain may have adverse effects on recorded tv thumbnails if ar changes during presentation ex. commercials @ diff ar
var vf = "scale=600:trunc(600/dar/2)*2";
if (threedFormat.HasValue)
{
switch (threedFormat.Value)
{
case Video3DFormat.HalfSideBySide:
vf = "crop=iw/2:ih:0:0,scale=(iw*2):ih,setdar=dar=a,crop=min(iw\\,ih*dar):min(ih\\,iw/dar):(iw-min(iw\\,iw*sar))/2:(ih - min (ih\\,ih/sar))/2,setsar=sar=1,scale=600:trunc(600/dar/2)*2";
// hsbs crop width in half,scale to correct size, set the display aspect,crop out any black bars we may have made the scale width to 600. Work out the correct height based on the display aspect it will maintain the aspect where -1 in this case (3d) may not.
break;
case Video3DFormat.FullSideBySide:
vf = "crop=iw/2:ih:0:0,setdar=dar=a,crop=min(iw\\,ih*dar):min(ih\\,iw/dar):(iw-min(iw\\,iw*sar))/2:(ih - min (ih\\,ih/sar))/2,setsar=sar=1,scale=600:trunc(600/dar/2)*2";
//fsbs crop width in half,set the display aspect,crop out any black bars we may have made the scale width to 600.
break;
case Video3DFormat.HalfTopAndBottom:
vf = "crop=iw:ih/2:0:0,scale=(iw*2):ih),setdar=dar=a,crop=min(iw\\,ih*dar):min(ih\\,iw/dar):(iw-min(iw\\,iw*sar))/2:(ih - min (ih\\,ih/sar))/2,setsar=sar=1,scale=600:trunc(600/dar/2)*2";
//htab crop heigh in half,scale to correct size, set the display aspect,crop out any black bars we may have made the scale width to 600
break;
case Video3DFormat.FullTopAndBottom:
vf = "crop=iw:ih/2:0:0,setdar=dar=a,crop=min(iw\\,ih*dar):min(ih\\,iw/dar):(iw-min(iw\\,iw*sar))/2:(ih - min (ih\\,ih/sar))/2,setsar=sar=1,scale=600:trunc(600/dar/2)*2";
// ftab crop heigt in half, set the display aspect,crop out any black bars we may have made the scale width to 600
break;
default:
break;
}
}
var mapArg = imageStreamIndex.HasValue ? (" -map 0:v:" + imageStreamIndex.Value.ToString(CultureInfo.InvariantCulture)) : string.Empty;
// Use ffmpeg to sample 100 (we can drop this if required using thumbnail=50 for 50 frames) frames and pick the best thumbnail. Have a fall back just in case.
var args = useIFrame ? string.Format("-i {0}{3} -threads 0 -v quiet -vframes 1 -vf \"{2},thumbnail=30\" -f image2 \"{1}\"", inputPath, tempExtractPath, vf, mapArg) :
string.Format("-i {0}{3} -threads 0 -v quiet -vframes 1 -vf \"{2}\" -f image2 \"{1}\"", inputPath, tempExtractPath, vf, mapArg);
var probeSize = GetProbeSizeArgument(new[] { inputPath }, protocol);
if (!string.IsNullOrEmpty(probeSize))
{
args = probeSize + " " + args;
}
if (offset.HasValue)
{
args = string.Format("-ss {0} ", GetTimeParameter(offset.Value)) + args;
}
var process = new Process
{
StartInfo = new ProcessStartInfo
{
CreateNoWindow = true,
UseShellExecute = false,
FileName = FFMpegPath,
Arguments = args,
WindowStyle = ProcessWindowStyle.Hidden,
ErrorDialog = false
}
};
_logger.Debug("{0} {1}", process.StartInfo.FileName, process.StartInfo.Arguments);
using (var processWrapper = new ProcessWrapper(process, this, _logger, false))
{
await resourcePool.WaitAsync(cancellationToken).ConfigureAwait(false);
bool ranToCompletion;
try
{
StartProcess(processWrapper);
ranToCompletion = process.WaitForExit(10000);
if (!ranToCompletion)
{
StopProcess(processWrapper, 1000, false);
}
}
finally
{
resourcePool.Release();
}
var exitCode = ranToCompletion ? processWrapper.ExitCode ?? 0 : -1;
var file = new FileInfo(tempExtractPath);
if (exitCode == -1 || !file.Exists || file.Length == 0)
{
//.........这里部分代码省略.........
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