![]() ![]() Using the JMF VCM decoder wrapper class requires individual VCM codecs to be installed on the machine.Slow capture devices might not work if stopped and started.Motion JPEG capture at larger than 320x240 will not be rendered correctly.Exit with the "Exit" item on the File menu. When using JMStudio and VFW capture, do not exit by hitting.VFW capture can only be used once per instance of VM.Here are a few capture devices we tested with known problems: But we have only tested JMF against a few capture cards/cameras. The JMF Windows performance pack supports all video capture devices which use the VFW (Video for Windows) interface.However reducing the buffer size to too small a value may result in audio breakup. It can be used to control the rendering latency. Java Sound's render buffer size can be controlled by the BufferControl obtained from the Player.Changing to a different capture format after Java Sound has already opened for output will fail. In such cases, Java Sound can only capture in the same format as the rendered output format. Provided that a sound card supports simultaneous capture and output (duplex), Java Sound can capture and render at the same time.Depending on the particular capture device, multiple instances of Java Sound or Direct Audio capture across different VM's on the same machine may or may not work. Capture using Java Sound or Direct Audio can only be used once per instance of VM.The Direct Audio renderer and capturer are only supported on Windows.In the All-Java versions of JMF, video capturing is not supported, and audio capture is only supported when running on J2SE 1.3 (which has the Java Sound API bundled with it).The audio playback quality of the All-java JMF is at mono, 8K ulaw (the format supported by the VM with the sun.audio interface).Negative playback rates are not supported.Some of the control types are not implemented: H261Control, H263Control, KeyFrameControl, MpegAudioControl, PortControl. ![]()
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