Limits RegistryPUBLIC RECORD
Limits RegistryH.120, developed by the European COST 211 project and published by the CCITT in 1984, was the first digital video compression standard. It ran at 1,544 kbit/s for NTSC and 2,048 kbit/s for PAL using conditional replenishment and DPCM; picture quality proved inadequate and few implementations were built, but it led to H.261 and every later codec.
The question, scope, and sources behind this Registry record.
H.120, developed by the European COST 211 project and published by the CCITT in 1984, was the first digital video compression standard. It ran at 1,544 kbit/s for NTSC and 2,048 kbit/s for PAL using conditional replenishment and DPCM; picture quality proved inadequate and few implementations were built, but it led to H.261 and every later codec.
The year the CCITT (now ITU-T) published H.120, the first digital video compression standard.
Change a parameter to stress-test whether a proposed result is still inside the published specification. This is an audit aid, not a proof checker.
This record has no editable parameters. Read the formal question and assumptions before challenging it.
Current frontiers derived from accepted Claims.
An observed or demonstrated result; no opposing bound is implied.
The frontier is not sacred
Most progress starts with a disagreement that survives contact with evidence. If you can push the known lower bound up or pull the upper bound down, show us the work.
≥ when you have shown that at least this value is achievable.≤ when you have shown that anything above this value is impossible.No vibes. State the value, define the scope, and link the paper, proof, code, or reproduction that lets another person check it. Editors review every challenge before the public record changes.
Challenge this recordAssertions tied to evidence, attribution, and review.
The frontier as it changed over time.
Only accepted Claims matching the current specification contribute to the displayed bounds. Strict inequalities remain open; contradictory Claims require editorial review.
1 accepted Claim, with 1 linked evidence records.
Permanent ID limitsregistry.com/limits/LR-H120-FIRST-DIGITAL-VIDEO-STANDARD
No active verified bounties are linked to this Limit.
View verified bounty tracker ↗No accepted machine-checked reproductions are recorded for this Limit.
Limits Registry. LR-H120-FIRST-DIGITAL-VIDEO-STANDARD. First digital video compression standard (H.120). 2026.