Fix log flooding issue when processing SRT streams containing SCTE-35
PIDs or other unrecognized stream types.
The `SrsSrtFormat::on_srt_packet()` method continuously parses TS
packets throughout the entire stream lifetime. The TS parser logs
warnings for every unrecognized stream type (like SCTE-35) in the PMT,
causing log flooding.
However, `SrsFormat` is only used to detect audio/video codec
information. Once both codecs are detected, there's no need to continue
parsing TS packets.
Note: This fix mitigates the problem - there will still be some warning
logs during the initial codec detection phase (typically 5-10 seconds),
but the continuous log flooding after codec detection is completely
eliminated.
3f2539d8fb
