SCTE-35 decoding

While monitoring, streamtop decodes SCTE-35 cues from HLS tags (#EXT-OATCLS-SCTE35, #EXT-X-SCTE35, #EXT-X-DATERANGE with SCTE35-OUT, SCTE35-IN, SCTE35-CMD, and #EXT-X-CUE-OUT / CUE-IN) and from DASH emsg boxes. They appear in the event log and in the summary JSON.

streamtop scte35

To decode a single cue without a stream, pass it to streamtop scte35:

streamtop scte35 "/DAvAAAAAAAA///wFAVIAACPf+/+c2nALv4AUsz1AAAAAAAKAAhDVUVJAAABNWLbowo="

table_id            0xfc
protocol_version    0
splice_command      Splice Insert (0x05)
splice_event_id     1207959695 (0x4800008f)
out_of_network      yes
pts_time            1936310318 (21514.559089s)
break_duration      60.293567s
break_auto_return   yes

Accepted input:

• Base64 (standard or URL-safe alphabet)
• Hex, with or without 0x. A string made only of hex digits is always read as hex
• An HLS tag line: #EXT-OATCLS-SCTE35:..., #EXT-X-SCTE35:CUE="...", or #EXT-X-DATERANGE with SCTE35-OUT, SCTE35-IN, or SCTE35-CMD
• - to read the payload from stdin

streamtop scte35 0xFC302F000000000000FFFFF014054800008F7FEFFE7369C02EFE0052CCF500000000000A0008435545490000013562DBA30A
grep -m1 OATCLS playlist.m3u8 | streamtop scte35 -
streamtop scte35 --json "/DA0AAAAAAAA///wBQb+cr0AUAAeAhxDVUVJSAAAjn/PAAGlmbAICAAAAAAsoKGKNAIAmsnRfg=="

The text output covers splice_insert, time_signal, splice_schedule, splice_null, and bandwidth_reservation, and each segmentation descriptor (event id, type, duration, UPID, segment numbers, delivery flags). --json prints the same fields as the summary JSON. The command exits 1 when the bytes are not a valid splice_info_section.

It does not verify the CRC, decrypt encrypted sections, or encode new cues. For encoding and injection, see threefive or TSDuck.