Is

Previous video:    • How is this speedrun possible? Super ...  
Update: Kosmic got a 4:55.646 on January 18th, 2020:    • Super Mario Bros. Any% Speedrun in 4:...  
- Patreon:   / bismuth9  
- Twitch:   / bismuth9  
- Twitter:   / bismuthi  
- Discord   / discord  

tavenwebb2002 got a 4:55.746 on August 3rd, 2019:    • (4:55.746) Super Mario Bros. any% spe...  

somewes
- Twitch:   / somewes  
- YouTube:    / somewes  
- Twitter:   / somewes  
- Minus World Ending WR:    • Super Mario Bros. Minus World Ending ...  

Kosmic
- Twitch:   / kosmic  
- YouTube:    / kosmicd12  
- Twitter:   / kosmicd12  
- Warpless WR:    • SMB1 Warpless Speedrun in 19:02.369 (...  
- Glitchless WR:    • SMB1 Glitchless Speedrun in 5:03.716 ...  

Super Mario Bros. Leaderboards: https://www.speedrun.com/smb1
Frame Count spreadsheet: https://docs.google.com/spreadsheets/...

Chapters:
00:00 - Introduction, History lesson, somewes's 6022 attempts, Kosmic's attempts
03:30 - Summary of previous video
05:34 - 1-1 Flagpole glitch, 1-2 pipe clip
07:26 - 4-1 Flagpole glitch, 4-2, 8-1, 8-2 Bullet bill glitch, 8-3 Flagpole glitch
10:20 - 8-4
12:25 - The return of somewes
14:44 - Fastest 8-4
16:07 - 8-1 Framerule
19:53 - Is 4:54 impossible? Tool-assisted speedrun
22:09 - TAS comparison
26:35 - Conclusion, how to achieve 4:54

Other speedrunners featured in this video:

darbian (4:56.528)
- PB: https://www.youtu.be/Wf9zPeN2va4
- Twitch:   / darbian  
- YouTube:    / darbiansrl  
- Twitter:   / darbiansrl  

StuckInAPlate (4:56.978)
- PB:    • Super Mario Bros. Any% PB [4:56.978]  
- Twitch:   / stuckinaplate  
- YouTube:    / @stuckinaplate_  
- Twitter:   / stuckinaplate  

GTAce (4:57.144, 8-4 IL WR)
- Twitch:   / gtace99  
- YouTube:    / @gtace99  
- 8-4 IL WR:    • [FWR] Super Mario Bros. 8-4 IL Speedr...  

andrewg (4:57.294)
- PB: https://.   • Super Mario Bros. Speedrun - 4:57.29  
- Twitch:   / andrewg1990  
- YouTube:    / andrewg1990  
- Twitter:   / andrewgspeedrun  

HappyLee (Author of the TAS)
- TAS (4:54.032): http://tasvideos.org/1715M.html
- RTA Rules TAS (4:54.282):    • [TAS] NES Super Mario Bros. "No Simul...  
- YouTube:    / happylee12  


Special Thanks, for helping in some manner:
🍌
Kosmic
somewes
HappyLee
darbian
StuckInAPlate
GTAce99
andrewg
micro500
theballaam96
trud
Znernicus