Method and apparatus for minimizing timing artifacts in remultiplexing
View Patent ↗A particular implementation for controlling single program transport streams during remultiplexing to a multiple program transport stream uses a series of leaky bucket buffers to minimize timing artifacts in the multi-program transport stream. Another implementation for controlling the remultiplexing process limits the number of consecutive packets to be transferred from each single program transport stream, or controls the multiplex frequency of each single program transport stream within the multi-program transport stream. An alternative implementation controls the remultiplexing process using multiple program clock reference values such that packets from each single program transport stream are released only after a previous program clock reference value is greater than the system time.
1. A method for controlling a plurality of single program transport streams during remultiplexing, comprising:
buffering in a buffer of a plurality of single program transport streams;
determining, by a processor, a transfer data rate for each of the plurality of buffered single program transport streams, said transfer data rate being based on a drain data rate of a decoder transport buffer for the plurality of buffered single program transport streams;
transferring, by the processor, the plurality of buffered single program transport streams to a multiplex buffer associated with a multiple program transport stream at said determined transfer data rate for each of the plurality of buffered stream single program transport streams, said plurality of buffered single program transport streams being transferred to the multiplex buffer in alternating order;
buffering each of the plurality of single program transport streams;
restamping, by the processor, a program clock reference value; and
padding the plurality of single program transport streams with null packets.
2. The method of claim 1 , further comprising buffering each elementary stream of the plurality of single program transport streams.
3. The method of claim 1 , further comprising basing the transfer data rate on at least one of a bit_rate_value, a stream_type, a stream_id, or a constant value.
4. An apparatus for controlling a plurality of single program transport streams during remultiplexing, comprising:
at least one buffer that buffers a plurality of single program transport streams;
a processor that determines a transfer data rate from said at least one buffer for each of the plurality of buffered single program transport streams, said transfer data rate being based on a drain data rate of decoder transport buffer for plurality of buffered single program transport streams and transfers the plurality of buffered single program transport streams to a multiplex buffer associated with a multiple program transport stream at said determined transfer data rate for each of the plurality of buffered single program transport streams, said plurality of buffered single program transport streams being transferred to the multiplex buffer in alternating order;
a buffer of each of the plurality of single program transport streams;
the processor that restamps a program clock reference value; and
a buffer to pad the plurality of single program transport streams with null packets.
5. The apparatus of claim 4 , further comprising: a buffer of each elementary stream of the plurality of single program transport streams.
6. The apparatus of claim 4 wherein said transfer data rate is based on at least one of a bit_rate_value, a stream_type, a stream_id, or a constant value.