Hi,
I am writing a simple YUV media source to take in .yuv bytestreams and send it to the EVR. I have modified the MFT_Grayscale to act as a dummy transform to copy the yuv samples to the EVR. I am also using the playbackFX sample for the player.
I'm having a problem with the player just showing a black screen, as if no samples are being sent to the EVR. I have verified that the samples are being processed in the dummy transform with the correct image size and attributes for my given yuv sample. I have tried other yuv samples and all just display a black screen, but the samples are being processed for sure. Is there any way to debug this to see if the samples are being sent to the EVR Or does anyone have any clues why this is happening
Thanks!
uncompressed YUV to EVR
Soxiz
hi
seems ok...
lets try this:
1) put original MFT_Grayscale instead of your transform
we'll narrow the problem to MFSource or MFT
2) post the code you use to create samples
HariAdu
I met a similiar problem. In my problem, the video content can be seen when the WMP is in full screen mode and the black screen is shown when the WMP is in window mode. I am looking a solution also.
Rahul Singla
Hi tony,
I will try to replace the MFT with the MFT_Grayscale. In the meantime, here is my sample creation code:
HRESULT YuvStream::CreateVideoSample(IMFSample **ppSample)
{
HRESULT hr = S_OK;
IMFMediaBuffer *pBuffer = NULL;
IMFSample *pSample = NULL;
ULONG cbRead = 0;
DWORD cbBuffer = 0;
BYTE *pData = NULL;
LONGLONG duration = 10000000;
BOOL bBufferLocked = FALSE;
cbBuffer = m_pSource->m_cbImageSize;
//sample size // Create the buffer.hr = MFCreateMemoryBuffer(cbBuffer, &pBuffer);
if (SUCCEEDED(hr)){
// Get a pointer to the buffer memory.hr = pBuffer->Lock(&pData, NULL, NULL);
// Set this flag so that we're sure to unlock the buffer, even if // the next call fails.bBufferLocked = SUCCEEDED(hr);
}
// Fill the buffer if (SUCCEEDED(hr)){
hr = m_pSource->m_pByteStream->Read(pData, cbBuffer, &cbRead);
}
// Unlock the buffer. if (bBufferLocked){
hr = pBuffer->Unlock();
}
// Set the size of the valid data in the buffer. if (SUCCEEDED(hr)){
hr = pBuffer->SetCurrentLength(cbRead);
}
// Create a new sample and add the buffer to it. if (SUCCEEDED(hr)){
hr = MFCreateSample(&pSample);
}
if (SUCCEEDED(hr)){
hr = pSample->AddBuffer(pBuffer);
}
// Set the time stamps, duration, and sample flags. if (SUCCEEDED(hr)){
hr = pSample->SetSampleTime(m_rtCurrentPosition);
}
if (SUCCEEDED(hr)){
hr = pSample->SetSampleDuration(duration);
}
if (SUCCEEDED(hr)){
// Set the discontinuity flag. if (m_discontinuity){
hr = pSample->SetUINT32(MFSampleExtension_Discontinuity, TRUE);
}
}
if (SUCCEEDED(hr)){
// Update our current position.m_rtCurrentPosition += duration;
// Give the pointer to the caller.*ppSample = pSample;
(*ppSample)->AddRef();
}
SAFE_RELEASE(pBuffer);
SAFE_RELEASE(pSample);
return hr;}
tkrasinger
no more ideas...
have a look at this
ftp://fido.tsc.ru/incoming/Vista/MF/Forum/2007-01-07.ZIP
that's my test samples
they definitely work for YUY2
Fox Me Up
strange...
try this link:
disk.tom.ru/282402 pw=CB38oqPF
or tell your ftp adress for upload
Lana Najm
hi tony,
since they are just yuv frames, i start the time at 0, and the duration of 1 second (10000000 100 nano second units). and i increment each timestamp by the duration for each frame.
is something wrong with this
Free Hall
Yes, this sounds like it's a different issue from the couple of fullscreen issues we've been talking about.
One question: Do you happen to know whether this problem is specific to your video type (specifically the FourCC) or whether this happens for other FourCCs like YV12 It's fine if you don't have the means to determine this; this just might help us narrow down the problem a bit.
GiovanniP
hi all
when copying a YUV sample from src to dest using MFCopyImage, for some reason it turns out to be greyscale even though though the original image has color. The UV bytes are not being set properly...anyone else have this issue
zhihao
TrevorW
DKB
Pierce28
hi
hr = m_pSource->m_pByteStream->Read(pData, cbBuffer, &cbRead);
what is contained in m_pByteStream
one frame
sequence of frames
is file pointer at the right place
what is returned in cbRead
Markus Fischer
hi tony,
yes each is one frame of yuv data
i have confirmed this by printing out size of each sample..
Joao Pinto
hi
try to check start time and duration of your samples
it looks like they come to EVR later then the time they are stamped, so EVR just drops them...