H.264/AVC data partitioning for mobile video communication

Engineering wireless broadband access to IPTV

“…The wireless channel characteristics also had to be known in advance by the encoder. However, leaving aside the computational complexity of the optimization search in [17], there is another key difference between the scheme of [17] and this paper. In [17] no feedback occurs, so that it is not possible to request additional redundant data.…”

“…However, leaving aside the computational complexity of the optimization search in [17], there is another key difference between the scheme of [17] and this paper. In [17] no feedback occurs, so that it is not possible to request additional redundant data. In fact, when using punctured convolutional codes in [17] (rather than the rateless codes used herein) it is not possible to generate additional redundant data.…”

“…In [17] the researchers compared non-scalable video coding with data partitioning using H.264/AVC under similar application and channel constructions for conversational applications over mobile channels. The experimental results showed that by using the data-partitioning scheme the number of entirely lost frames can be lowered and the probability of poor quality decoded video can be reduced.…”

“…The experimental results showed that by using the data-partitioning scheme the number of entirely lost frames can be lowered and the probability of poor quality decoded video can be reduced. In the data-partitioning scheme of [17], differential protection was achieved by selecting from a set of discrete channel coding rates, through punctured convolutional codes. However, in order to determine the protection level, an optimization procedure was necessary to minimize potential distortion.…”

“…Though the authors' scheme as a whole has been analysed in previous works such as in [15] [16], the individual codec settings have not been analysed in isolation, whereas it has been suggested to the lead author that a very helpful service to the system developer community would be to analyze codec settings independently of each other. The authors' scheme combines data-partitioning as a form of error resilience [17] with the addition of forward error correction (FEC) using rateless channel coding [18] at the application layer, together with retransmission of extra redundant data when required. Retransmission is limited to one round to avoid accumulating latencies.…”