User manual VIEWCAST NIAGARA GOSTREAM SURF

[. . . ] Document Number: 40-03225-08-A Date: November 2009 Niagara GoStream SURF Niagara GoStream SURF User Guide COPYRIGHTS Copyright© 2009 ViewCast Corporation. Trademarks or registered trademarks of ViewCast Corporation or its subsidiaries include: ViewCast ViewCast logo Niagara Niagara logo Niagara SCX SimulStream GoStream Osprey Trademarks or registered trademarks of Microsoft Corporation include: Microsoft Windows Windows XP Windows Media Trademarks or registered trademarks of RealNetworks Inc. Corporation include: RealVideo RealPlayer RealSystem Helix SureStream Trademarks or registered trademarks of Apple Inc. include: QuickTime iPod Trademarks or registered trademarks of Adobe Systems Inc. [. . . ] AMR was adopted as the standard wideband speech codec by 3GPP and is widely used in GSM. NOTE: When you select AMR-NB Encoder for audio, the audio will automatically be encoded using 8 kHz mono for the playback on cell phones. When you select AMR-WB for audio, you must change the Audio Format to be 16 kHz, 16 bit, mono, for playback on cell phones. 6. Click Submit. 62 ViewCast Niagara GoStream SURF User Guide Output Tab Figure 63. If you do not want this, change the IP address for Group to the IP address of the server to which you want to stream from the encoder. In the SDP File field, enter a name and a destination path for the resulting SDP file created when you start the stream. If you are streaming to a Helix, a Quicktime, or a Darwin server, refer to its respective documentation or online message boards for setup details specific for the individual streaming server. NOTE: You can stream point-to-point by selecting a share destination directory for the saved SDP file. Remember to disable multicasting by entering in the IP address of the PC to which you want to stream. For example, if you want another PC to view the stream, save the SDP file to a share folder on the local drive. The other PC can open the SDP file and the stream can be played in a Quicktime or other MPEG-4 compatible streaming player. Since MPEG-4 encoding can be CPU intensive, it is not recommended that you view the stream on the same system as the Niagara SCX encoder unless you have a powerful system (dual-core processors or better). Doing so ViewCast 63 Chapter 4: Advanced Operations Step Action may overtax the host CPU, which will cause video quality degradation and encode session failure. You can either: Click the Save to File checkbox to save the encoded content to a file. Each time you start this encoder, the system overwrites the previous file. Or Click Create unique file to create a file that the system does not overwrite. Accept the default location that displays in the File Name field or choose your own location for the file (Figure 64). To choose your own personal location select the link (horizontal ellipses or . . . NOTE: By default, the system sets this folder to D:\AVFiles\Out\ with a default file name of capture. xxx. ViewCast strongly recommends you do not alter the default directory setting unless you fully understand the risk of saving your files to a directory not located on drive D. If you save your files to another drive on the Niagara GoStreamSURF, the system could delete the files when you use the Restore to Niagara GoStream SURF Factory Defaults feature. Only drive D on the Niagara GoStream SURF has available storage to save your files. [. . . ] This value means the quantizer assigned to each frame is blurred temporally with its neighbors to limit quantizer fluctuations. This value sets the targets average reduction in bit rate for Bframes as compared to P-frames. This value makes them better references, which can improve the overall image quality. The problem is that the extra bits taken by the B-frames are taken from the Pframes, which makes this variable a balancing act. [. . . ]