real - videos 3d para lentes de cine
¿Cómo detectar que una película es 3D? (2)
¿Alguien sabe cómo detectar que un archivo de video es una película en 3D?
Intenté usar la herramienta ffmpeg, pero no tuve éxito en descubrir cómo hacerlo.
Depende del formato.
En el nivel de transmisión: para AVC, puede buscar los mensajes SEI de la disposición de empaquetado de fotogramas. Para MVC, puede buscar los NAL de extensión de corte (tipo = 20).
http://www.merl.com/reports/docs/TR2011-022.pdf
Miré tu archivo. Es AVC 3D con marco tipo 3 (uno al lado del otro - L está a la izquierda, R a la derecha). Extraí la secuencia H.264 y encontré en el desplazamiento de bytes 0x23: 00 00 00 01 06 2D este es un mensaje SEI (06) de la disposición de empaquetado de cuadros de tipo (2D). De hecho, su archivo contiene información que indica 3D
Herramienta de línea Comannd para detectar 3D
- Extraiga la secuencia h.264 utilizando mp4box -raw 1 82-3D-LHelEIJVxiE.mp4 ( http://gpac.wp.mines-telecom.fr/mp4box/ )
tomar la corriente elemental H.264 82-3D-LHelEIJVxiE_track1.h264 y ejecutarla a través del siguiente código:
#include <iostream>
#include <fstream>
typedef unsigned char uint8_t;
enum ResultCode
{
E_Error = -1,
E_OK = 0,
E_No3D = 2,
E_Found3D = 3,
};
enum NALType
{
NALType_Unknown = 0,
NALType_Slice = 1,
NALType_Slice_DPA = 2,
NALType_Slice_DPB = 3,
NALType_Slice_DPC = 4,
NALType_Slice_IDR = 5,
NALType_SEI = 6,
NALType_SPS = 7,
NALType_PPS = 8,
NALType_AU_Delimiter = 9,
NALType_SequenceEnd = 10,
NALType_StreamEnd = 11,
NALType_FillerData = 12,
NALType_CodedSliceExtension = 20,
NALType_MAX = 0x1f
};
enum SEIType
{
SEIType_FramePackingArrangement = 0x2D
};
enum StartCodeState
{
StartCodeState_none,
StartCodeState_0,
StartCodeState_0_0,
StartCodeState_0_0_1
};
int Is3D(std::ifstream & inputFile)
{
int nResult = E_OK;
StartCodeState eStartCodeState = StartCodeState_none;
while( (E_OK == nResult) && ( ! inputFile.eof() ) )
{
uint8_t byte = inputFile.get();
switch(eStartCodeState)
{
case StartCodeState_none :
eStartCodeState = (byte == 0) ? StartCodeState_0 : StartCodeState_none;
break;
case StartCodeState_0 :
eStartCodeState = (byte == 0) ? StartCodeState_0_0 : StartCodeState_none;
break;
case StartCodeState_0_0 :
switch(byte)
{
case 0 : eStartCodeState = StartCodeState_0_0; break;
case 1 : eStartCodeState = StartCodeState_0_0_1; break;
default : eStartCodeState = StartCodeState_none;
}
default:
;
}
if( eStartCodeState == StartCodeState_0_0_1 )
{
uint8_t cNALType = inputFile.get();
cNALType &= NALType_MAX;
switch(cNALType)
{
case NALType_CodedSliceExtension :
nResult = E_Found3D;
break;
case NALType_SEI :
{
uint8_t cSEIType = inputFile.get();
if( cSEIType == SEIType_FramePackingArrangement )
{
nResult = E_Found3D;
}
break;
}
default:
;
}
eStartCodeState = StartCodeState_none;
}
}
return nResult;
}
int main(int argc, char * argv[])
{
int nResult = E_OK;
if( argc != 2 )
{
nResult = E_Error;
std::cerr << "Usage: "
<< argv[0]
<< " <H.264 elementary stream input file>"
<< std::endl;
}
if( E_OK == nResult )
{
std::ifstream inputFile(argv[1], std::ios::binary);
if( inputFile.is_open() )
{
if( E_Found3D == Is3D(inputFile) )
{
std::cout << "File: "
<< argv[1]
<< " contains 3D."
<< std::endl;
nResult = E_Found3D;
}
else
{
std::cout << "No 3D found" << std::endl;
nResult = E_No3D;
}
}
else
{
std::cerr << "Error opening input file: "
<< argv[1]
<< std::endl;
nResult = E_Error;
}
}
return nResult;
}
Herramienta de línea Comannd para detectar 3D:
- Extraiga la secuencia h.264 utilizando mp4box -raw 1 82-3D-LHelEIJVxiE.mp4 ( http://gpac.wp.mines-telecom.fr/mp4box/ )
tomar la corriente elemental H.264 82-3D-LHelEIJVxiE_track1.h264 y ejecutarla a través del siguiente código:
#include <iostream>
#include <fstream>
typedef unsigned char uint8_t;
enum ResultCode
{
E_Error = -1,
E_OK = 0,
E_No3D = 2,
E_Found3D = 3,
};
enum NALType
{
NALType_Unknown = 0,
NALType_Slice = 1,
NALType_Slice_DPA = 2,
NALType_Slice_DPB = 3,
NALType_Slice_DPC = 4,
NALType_Slice_IDR = 5,
NALType_SEI = 6,
NALType_SPS = 7,
NALType_PPS = 8,
NALType_AU_Delimiter = 9,
NALType_SequenceEnd = 10,
NALType_StreamEnd = 11,
NALType_FillerData = 12,
NALType_CodedSliceExtension = 20,
NALType_MAX = 0x1f
};
enum SEIType
{
SEIType_FramePackingArrangement = 0x2D
};
enum StartCodeState
{
StartCodeState_none,
StartCodeState_0,
StartCodeState_0_0,
StartCodeState_0_0_1
};
int Is3D(std::ifstream & inputFile)
{
int nResult = E_OK;
StartCodeState eStartCodeState = StartCodeState_none;
while( (E_OK == nResult) && ( ! inputFile.eof() ) )
{
uint8_t byte = inputFile.get();
switch(eStartCodeState)
{
case StartCodeState_none :
eStartCodeState = (byte == 0) ? StartCodeState_0 : StartCodeState_none;
break;
case StartCodeState_0 :
eStartCodeState = (byte == 0) ? StartCodeState_0_0 : StartCodeState_none;
break;
case StartCodeState_0_0 :
switch(byte)
{
case 0 : eStartCodeState = StartCodeState_0_0; break;
case 1 : eStartCodeState = StartCodeState_0_0_1; break;
default : eStartCodeState = StartCodeState_none;
}
default:
;
}
if( eStartCodeState == StartCodeState_0_0_1 )
{
uint8_t cNALType = inputFile.get();
cNALType &= NALType_MAX;
switch(cNALType)
{
case NALType_CodedSliceExtension :
nResult = E_Found3D;
break;
case NALType_SEI :
{
uint8_t cSEIType = inputFile.get();
if( cSEIType == SEIType_FramePackingArrangement )
{
nResult = E_Found3D;
}
break;
}
default:
;
}
eStartCodeState = StartCodeState_none;
}
}
return nResult;
}
int main(int argc, char * argv[])
{
int nResult = E_OK;
if( argc != 2 )
{
nResult = E_Error;
std::cerr << "Usage: "
<< argv[0]
<< " <H.264 elementary stream input file>"
<< std::endl;
}
if( E_OK == nResult )
{
std::ifstream inputFile(argv[1], std::ios::binary);
if( inputFile.is_open() )
{
if( E_Found3D == Is3D(inputFile) )
{
std::cout << "File: "
<< argv[1]
<< " contains 3D."
<< std::endl;
nResult = E_Found3D;
}
else
{
std::cout << "No 3D found" << std::endl;
nResult = E_No3D;
}
}
else
{
std::cerr << "Error opening input file: "
<< argv[1]
<< std::endl;
nResult = E_Error;
}
}
return nResult;
}