public Stream GetFrameStream(Config c, string virtualPath, System.Collections.Specialized.NameValueCollection queryString)
{
var job = new FFmpegJob(queryString);
bool bufferToTemp = !File.Exists(HostingEnvironment.MapPath(virtualPath));
job.SourcePath = !bufferToTemp?HostingEnvironment.MapPath(virtualPath) : Path.GetTempFileName();
try
{
if (bufferToTemp)
{
using (Stream input = c.Pipeline.GetFile(virtualPath, new System.Collections.Specialized.NameValueCollection()).Open())
using (Stream output = File.Create(job.SourcePath))
{
input.CopyToStream(output);
}
}
this.Execute(job);
return(job.Result);
}
finally
{
if (bufferToTemp)
{
File.Delete(job.SourcePath);
}
}
}
private XElement GetVideoInfo(FFmpegJob job)
{
//*ffprobe.exe -loglevel error -show_format -show_streams inputFile.extension -print_format json*/
string result = RunExecutable(GetFFprobePath(), " -loglevel error -show_format -print_format xml -i \"" + job.SourcePath + "\"", job.Timeout / 2);
return(XElement.Parse(result));
}
private bool InnerExecute(FFmpegJob job)
{
if (job.Seconds == null)
{
var xml = GetVideoInfo(job);
var duration = (double)xml.Descendants("format").FirstOrDefault().Attributes("duration").FirstOrDefault();
job.Seconds = duration * job.Percent / 100;
}
bool failedTest = false;
var tries = 0;
do
{
if (tries > 4)
{
throw new Exception("Failed to locate a non-blank frame");
}
var path = Path.GetTempFileName();
byte[] result;
try{
string message = RunExecutable(GetFFmpegPath(), " -ss " + job.Seconds.ToString() + " -y -i \"" + job.SourcePath + "\" -an -vframes 1 -r 1 -f image2 -pix_fmt rgb24 \"" + path + "\"", job.Timeout);
if (message.Contains("Output file is empty, nothing was encoded"))
{
throw new Exception("You are outside the bounds of the video");
}
result = File.ReadAllBytes(path);
job.Result = new MemoryStream(result);
}finally{
File.Delete(path);
}
failedTest = (job.SkipBlankFrames == true && IsBlank(result, 10));
if (failedTest)
{
job.Seconds += job.IncrementWhenBlank ?? 5;
}
tries++;
} while (failedTest);
return(true);
}
public bool Execute(FFmpegJob job)
{
//If we have too many threads waiting to run CAIR, just kill the request.
if (MaxConcurrentWaitingThreads > 0 &&
_concurrentWaitingThreads > MaxConcurrentWaitingThreads)
{
throw new Exception("FFmpeg failed - too many threads waiting. Try again later.");
}
//If there are any threads waiting in line, or if the permitted number of CAIR.exe instances has been reached, get in line
if (_concurrentWaitingThreads > 0 || (MaxConcurrentExecutions > 0 &&
_concurrentExecutions > MaxConcurrentExecutions))
{
try
{
Interlocked.Increment(ref _concurrentWaitingThreads);
//Wait for a free slot
while (MaxConcurrentExecutions > 0 &&
_concurrentExecutions > MaxConcurrentExecutions)
{
turnstile.WaitOne(1000);
}
}
finally
{
Interlocked.Decrement(ref _concurrentWaitingThreads);
}
}
//Ok, there should be a free slot now.
try
{
//Register, we have our own process slot now.
Interlocked.Increment(ref _concurrentExecutions);
return(InnerExecute(job));
}
finally
{
Interlocked.Decrement(ref _concurrentExecutions);
turnstile.Set();
}
}
public bool Execute(FFmpegJob job)
{
//If we have too many threads waiting to run CAIR, just kill the request.
if (MaxConcurrentWaitingThreads > 0 &&
_concurrentWaitingThreads > MaxConcurrentWaitingThreads)
throw new Exception("FFmpeg failed - too many threads waiting. Try again later.");
//If there are any threads waiting in line, or if the permitted number of CAIR.exe instances has been reached, get in line
if (_concurrentWaitingThreads > 0 || (MaxConcurrentExecutions > 0 &&
_concurrentExecutions > MaxConcurrentExecutions))
{
try
{
Interlocked.Increment(ref _concurrentWaitingThreads);
//Wait for a free slot
while (MaxConcurrentExecutions > 0 &&
_concurrentExecutions > MaxConcurrentExecutions)
{
turnstile.WaitOne(1000);
}
}
finally
{
Interlocked.Decrement(ref _concurrentWaitingThreads);
}
}
//Ok, there should be a free slot now.
try
{
//Register, we have our own process slot now.
Interlocked.Increment(ref _concurrentExecutions);
return InnerExecute(job);
}
finally
{
Interlocked.Decrement(ref _concurrentExecutions);
turnstile.Set();
}
}
private bool InnerExecute(FFmpegJob job)
{
if (job.Seconds == null){
var xml = GetVideoInfo(job);
var duration = (double)xml.Descendants("format").FirstOrDefault().Attributes("duration").FirstOrDefault();
job.Seconds = duration * job.Percent / 100;
}
bool failedTest = false;
var tries = 0;
do
{
if (tries > 4) throw new Exception("Failed to locate a non-blank frame");
var path = Path.GetTempFileName();
byte[] result;
try{
string message = RunExecutable(GetFFmpegPath(), " -ss " + job.Seconds.ToString() + " -y -i \"" + job.SourcePath + "\" -an -vframes 1 -r 1 -f image2 -pix_fmt rgb24 \"" + path + "\"", job.Timeout);
if (message.Contains("Output file is empty, nothing was encoded"))
{
throw new Exception("You are outside the bounds of the video");
}
result = File.ReadAllBytes(path);
job.Result = new MemoryStream(result);
}finally{
File.Delete(path);
}
failedTest = (job.SkipBlankFrames == true && IsBlank(result,10));
if (failedTest) job.Seconds += job.IncrementWhenBlank ?? 5;
tries++;
} while (failedTest);
return true;
}
private XElement GetVideoInfo(FFmpegJob job)
{
//*ffprobe.exe -loglevel error -show_format -show_streams inputFile.extension -print_format json*/
string result = RunExecutable(GetFFprobePath(), " -loglevel error -show_format -print_format xml -i \"" + job.SourcePath + "\"", job.Timeout /2);
return XElement.Parse(result);
}
public Stream GetFrameStream(Config c,string virtualPath, System.Collections.Specialized.NameValueCollection queryString)
{
var job = new FFmpegJob(queryString);
bool bufferToTemp = !File.Exists(HostingEnvironment.MapPath(virtualPath));
job.SourcePath = !bufferToTemp ? HostingEnvironment.MapPath(virtualPath) : Path.GetTempFileName();
try
{
if (bufferToTemp)
{
using (Stream input = c.Pipeline.GetFile(virtualPath, new System.Collections.Specialized.NameValueCollection()).Open())
using (Stream output = File.Create(job.SourcePath))
{
StreamExtensions.CopyToStream(input, output);
}
}
this.Execute(job);
return job.Result;
}
finally
{
if (bufferToTemp) File.Delete(job.SourcePath);
}
}
