FFMPEG CreateProcess Setting ErrorCode 5 [Access Denied]
| Project: | FFMPEG |
| Component: | Miscellaneous |
| Category: | task |
| Priority: | normal |
| Assigned: | Unassigned |
| Status: | active |
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I am attempting to capture the output of an ffmpeg command to a text file using command line args:
ffmpeg.exe -i d:\testing\ValidFLV.flv 2>d:\testing\outPut.txt
Command works like a charm when executed from cmd prompt.
Within a C++ app I am Creating a Process to execute this command line and although CreateProcess "succeeds" the text file is not created and GetLastError() returns 5 which is AccessDenied. Other operations executed in this same manner work such as converting flv to asf and vice-a-versa. As well as pulling frames from a flv and/or asf movie. Even though the requested actions are completed and images and/or movie files are created GetLastError() returns 5. I am wondering if ffmpeg is having issues writing to stdout/stderr. I attempted to use _popen to pipe output directly to app and this doesn't work either nor does reading from stdout/stderr.
I am using WindowsServer2003 and this is a back office app that runs locally. No network access is required. Files and their subsequent output are stored locally.
Am compiling app with Visual Studio 2005.
code snipet:
bool ExecFFMPEG( )
{
bool bRet = true;
STARTUPINFO si;
PROCESS_INFORMATION pi;
si.cb = sizeof(STARTUPINFO);
si.lpReserved = NULL;
si.lpReserved2 = NULL;
si.cbReserved2 = 0;
si.lpTitle = NULL;
si.lpDesktop = NULL;
si.dwFlags = STARTF_USESHOWWINDOW;
SECURITY_ATTRIBUTES sa;
sa.bInheritHandle = TRUE;
sa.lpSecurityDescriptor = NULL;
sa.nLength = sizeof(SECURITY_ATTRIBUTES);
char cComm[128];
strcpy_s( cComm, 512, "ffmpeg.exe -i d:\testing\ValidFLV.flv 2> d:\testing\Logout.txt");
if( CreateProcess(NULL, cComm, &sa, &sa, TRUE, CREATE_PRESERVE_CODE_AUTHZ_LEVEL|HIGH_PRIORITY_CLASS, NULL, NULL, &si, &pi) != 0 )
WaitForSingleObject(pi.hProcess, INFINITE);
else
bRet = false;
int ex = 0;
TerminateProcess(pi.hProcess, ex);
CloseHandle(pi.hThread);
CloseHandle(pi.hProcess);
if( bRet )
{
int nErr = GetLastError();
if( nErr == 0 && _access_s("d:\testing\Logout.txt", 0) == 0 )
{
...
...
}
}
return bRet;
}This may be more of a VS05 question than an FFMPEG issue but I don't have this problem when shelling other apps
THanks
#1
#2
I figured away around it so I guess this issue can be considered solved, although I still believe that ffmpeg is having issues writing out to stdout/stderr, because although the following is a solution for me it still can not read output from the standard streams made available in the c++ language.
bool GetFLVInfo( )
{
bool bRet = false;
char cComm[MAX_STRING_MEDIUM];
char cOutput[MAX_STRING_EXTRALARGE];
char cLogFile[MAX_PATH];
char cDuration[MAX_STRING_TINY];
FILE *pPipe = 0;
DurationInSec = 0 ;
cDuration[0] = NULL;
strcpy_s( cLogFile, MAX_PATH, "d:\\SomeTest\\LogOut.txt");
sprintf_s( cComm, 512, "ffmpeg.exe -i d:\\SomeTest\\Movie.flv 2> %s", cLogFile);
if(cComm[0] )
{
pPipe = _popen( cComm, "rt");
int i = 0;
while( i < 2056 )
{
char cBuf[256];
cBuf[0] = NULL;
if( fgets(cBuf, 256, pPipe) == NULL)
break;
i += sprintf_s( cOutput + i, 2056 - i, "%s", cBuf);
}
_pclose(pPipe);
}
if( _access_s(cLogFile, 0) == 0 )
{
... ...
bRet = true;
}
return bRet;
}