Hello. I have been developing a media player application based on Media Foundation (MF). I start my presentations by calling "SetTopology(0,pTopology)". I want to implement a play list, so I have been allowing the code to call SetTopology(0, pTopology2) even when the first topology is still running.
My first presentation runs fine, but when it gets to the end, the second one starts and freezes almost immediately. I have noticed that if I "Pause" and then "Start" the presentation again, it renders the video at an accelerated rate until it catches up or freezes again... it typically quickly renders some and turns frozen almost immediately.
I will appreciate any suggestions.
Thanks!
My second MF Topology (presentation) freezes shortly after starting on Vista
ScottStonehouse
Here follows a log with the sequence of events. Additional explanatory comments are enclosed in angled brackets <>.
I have also noticed that sometimes the presentations play just fine, but that seems to be random and only a minority of times.
Thanks.
LOG:
<Created the topology>
CMfMediaSession::StartPresentation [SetTopology(0,pTopology)]
CMfMediaSession::CreateSession
<So far, created the media session and started to process events>
Media event: MESessionTopologySet
CMfMediaSession::OnTopologySet
Media event: MESessionNotifyPresentationTime
Media event: MESessionCapabilitiesChanged
Media event: MESessionTopologyStatus
MESessionTopologyStatus: [MF_TOPOSTATUS_READY]
CMfMediaSession::OnTopologyStatusReady
CMfMediaSession::StartPlayback
Media event: MESessionTopologyStatus
MESessionTopologyStatus: [MF_TOPOSTATUS_STARTED_SOURCE]
Media event: MESessionCapabilitiesChanged
Media event: MESessionStarted
CMfMediaSession::OnSessionStarted
<Here the first one is playing and I create and add the second one.>
CMfMediaSession::StartPresentation [SetTopology(0,pTopology)]
...
Media event: MESessionTopologySet
CMfMediaSession::OnTopologySet
... <the new one is set, but the original is still playing.>
Media event: MEEndOfPresentation <the original one>
CMfMediaSession::OnPresentationEnded
Media event: MESessionTopologyStatus
MESessionTopologyStatus: [MF_TOPOSTATUS_ENDED]
CMfMediaSession::OnTopologyStatusEnded
pTopology References: 6
Media event: MESessionNotifyPresentationTime
Media event: MESessionTopologyStatus
MESessionTopologyStatus: [MF_TOPOSTATUS_SINK_SWITCHED]
<The next event indicates that the second one is ready,
so I start it with:
m_pSession->Start(NULL, &varStart);
where varStart is a VT_EMPTY variant>
Media event: MESessionTopologyStatus
MESessionTopologyStatus: [MF_TOPOSTATUS_READY]
CMfMediaSession::OnTopologyStatusReady
CMfMediaSession::StartPlayback
Media event: MESessionTopologyStatus
MESessionTopologyStatus: [MF_TOPOSTATUS_STARTED_SOURCE]
<One thing I noticed is that I did not receive a
MESessionCapabilitiesChanged event here, as opposed
to after starting the first topology, when I did
receive it. See above.>
Media event: MESessionStarted
CMfMediaSession::OnSessionStarted
<HERE I was FROZEN>
CMfMediaSession::Pause
Media event: MESessionCapabilitiesChanged
Media event: MESessionPaused
CMfMediaSession::OnSessionPaused
CMfMediaSession::Play
CMfMediaSession::StartPlayback
Media event: MESessionCapabilitiesChanged
Media event: MESessionStarted
CMfMediaSession::OnSessionStarted
<After pausing and starting, the presentation
played at an increased speed to its end.>
Media event: MEEndOfPresentation
CMfMediaSession::OnPresentationEnded
Media event: MESessionTopologyStatus
MESessionTopologyStatus: [MF_TOPOSTATUS_ENDED]
CMfMediaSession::OnTopologyStatusEnded
pTopology References: 7
Media event: MESessionCapabilitiesChanged
Media event: MESessionEnded
CMfMediaSession::OnSessionEnded
<The I started the shutdown of everything>
Media event: MESessionCapabilitiesChangedMedia event: MESessionClosed
CMfMediaSession::OnSessionClosed
ChoKamir
The second Start() call (the one you make after getting MESessionTopologyStatus( MF_TOPOSTATUS_READY )) is unnecessary; you should just be able to sit back and let the Media Session take care of starting each presentation. Can you try that and let us know how that goes
As for the freezing, well, I don't think that should have happened; a Start( VT_EMPTY ) should just do nothing if you're already playing. We'll try that on our side and see if we can reproduce the problem.