orastream wrote: > For streaming, the OraStream (and ClassicsOnlineHD*LL" - a new CD- & > HD-quality classical music service with more than 70,000 classical music > albums, including 1,000 albums in 24-bit audio resolution) sites uses a > MPEG Audio standard format known as MPEG-4 SLS. You would note that this > codec is also called HD-AAC by its inventors. OraStream works with the > Non-Core version (i.e. without the lossy-AAC core) of MPEG 4-SLS. > > The OraStream platform utilises the fine-grain, scalable audio layers of > this lossless audio format to scale lossless and high-res audio > streaming based on the quality of the user's network connection. When a > user connects to our servers, the user's network connection is monitored > continuously in real-time. When a user's connection is good, every layer > of the bitstream is delivered for lossless audio playback. When the > connection is poorer, the server removes some layers (via a bitstream > truncation process that ensures optimal multi-channel distribution) to > match the poorer connection. > > Network adaptive audio streaming is dynamic, in real-time and > transparent to the user. Music streaming scales from 80 kbps to >5,500 > kbps (compressed bitrate quality of 24/192 audio) so quality of service > is assured in moderately congested 3G and public-WiFi network > conditions. In super fast networks, quality of experience can be > achieved with full lossless 24-bit audio streams. > > As MPEG-4 SLS applications include that of audio archival, the format > handles PCM audio in resolutions up to 24bit depth/192kHz sampling > frequency. Therefore, with a good connection, users can stream 16-bit, > 44.1 kHz and any higher resolution up to 24-bit, 192 kHz audio quality > on desktop PCs and mobile devices. > > Beside using different encoding methods, MQA encapsulation is carried > out during encoding and MQA files are fixed bit-rate files. The smallest > near CD- or CD-quality file (without MQA) requires about 1 Mbps > connection to stream (with good QoS experience). The MQA files (of > high-res audio recordings) are only about 50%-100% larger (for > downloads). Notwithstanding, Meridian claims that MQA files are > master-quality-authenticated (by artists, producers, sound engineers) to > sound as the original studio recordings are intended or better.
I have had a lot of problems with the Orastream player. Despite having a greater than 55 MBPS connection, the player frequently downsamples to mp3 quality. It refers to this as cache play. However, it never adapts, as it seems to stay in mp3 quality forever once it gets there. The selection of music is good. However, the problems with the player make it unlikely I will continue with this service long term. ------------------------------------------------------------------------ margolbe's Profile: http://forums.slimdevices.com/member.php?userid=30194 View this thread: http://forums.slimdevices.com/showthread.php?t=102914 _______________________________________________ discuss mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/discuss
