16 AXIS 210/210A/211/211A - Video StreamsOther MPEG-4 clientsAlthough it may be possible to use other clients to view the MPEG-4 stream, this is notguaranteed by Axis.For some other clients, e.g. QuickTime™ the Video Object Type must be set to Simple. Itmay also be necessary to adjust the advanced MPEG-4 settings.To assess the video stream from e.g. QuickTime™ the following path can be used:rtsp:///mpeg4/media.ampThis path is for all supported methods, and the client will negotiate with the AXIS210/210A/211/211A to determine exactly which transport protocol to use.Audio Stream Types (AXIS 210A/211A only)The stream types for audio are:• G.711 - International standard for encoding wired-telephone audio. Uses PCM samplesto compress audio where higher signal values are compressed more than lower values.In Axis products, this sets the coding type to μ-law 64 kbit/s.• G.726 - Uses PCM samples to code the difference between samples (ADPCM). Reducesbandwidth without losing too much useful audio. In Axis products, this sets the codedbit rate to 24 or 32 kbit/s.All stream types are ITU-T standards and operate on frequencies up to 4 kHz.Audio transmission methods (AXIS 210A/211A only)The audio stream can be accessed in the Live View page via Motion JPEG or MPEG-4.Using Motion JPEGThe basic audio transmission method used in conjunction with Motion JPEG videostreaming is transmission over HTTP. The video and audio streams are not synchronizedwhen using Motion JPEG, so the streams may be slightly out of sync. The latency in anystream should be low, but this will depend on the network infrastructure.Using MPEG-4When using MPEG-4, audio is streamed using the same protocol as the video stream.When audio is transmitted using MPEG-4, the AXIS 210A/211A sends synchronizationinformation along with the streams to the client performing the synchronization.Note: Audio is streamed from the client to the server over HTTP when using Motion JPEG and MPEG-4.
