Do Ivtc On Mpeg2 Without Encoder
Now it does not crash when starting MPEG2 capture, but does not produce an.avi file.tracing sample code. First it adds source audio and video filters for my Logitech USB cam. It adds Dump filter (derived from IFileSinkFilter, so I assume this is the one responsible for actually writing to a file?). It callsISampleCaptureGraphBuilder::BuildMPEG2Segment. Inside it, it does not find MPEG2 pin on the camera (correct), but finds a video pin.
The audio file is not good enough, do corrections and export only the audio and import that into the DVD authoring program (no need to wait for the mpeg 2 video export again). Two (or more) versions of languages (or music) in one DVD.
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CallsISampleCaptureGraphBuilder::RenderToMPEG2Demux with this pin. GetMedium from the pin returnsKsQueryMediums, so the code returns medium as GUIDNULL in this case. This causes a call toGetEncodersByCategory, that usesCreateClassEnumerator( KSCATEGORYENCODER ) - and that returns SFALSE, so no encoders found?Do I need to install/register encoders (how?) Or is this a side effect or something else gone wrong? When I open GraphEdit, I see (under DirectShow Filters) Microsoft MPEG2 Video Encoder, Audio Encoder and just Encoder.
Do Ivtc On Mpeg2 Without Encoder Software
Shouldit find those?Thanks! Ok, so according to this KSCATEGORYENCODER is Kernel Streaming Category, so I assume I would need something under 'WDM Streaming Encoder Devices' in GraphEdit, andI don't have anything. Is there any software I can download/buy that provides this? Or is there an easy way to change the sample to use some different type of encoder (for example, this Microsoft MPEG-2 Encoder or something else?)I assume I will have the same problem with KSCATEGORYMULTIPLEXER the sample uses later?Quality is not important in my case, if it can do 640x480 at 15 fps with some mono sound on a fast PC - it is all I need (this is a 'debug' feature in our tool chain - I don't want to spendtoo much time learning the details of DirectShow.).Thanks! Looks like ' WDM Streaming Encoder Devices' might be mostly for HW encoders (?).I made a simple graph in GraphEdit out of 4 boxes (video and audio capture sources, Microsoft MPEG2 encoder, FileWriter) and it seem to write encoded files (at least they are 17+ times smaller then if I replaceencoder with just AVI mux). I guess I will try to implement the same graph in C and use it (add some interfaces to configure parameters).
I'm surprised though that such a basic functionality as grabbing input from a web cam and recording it with compressionis not implemented in a robust way in a sample (or explained in docs). Maybe I missed something?Thanks!