Server-side mp4 lossless precise seeking is hard. Most of the time, you jump between keyframes. Tracey will show the initial idea, to speedup the fps of the video frames just before the exact wanted seek point. This became early custom patches to mod_h.264_streaming abandonware in 2013.

In 2021, it was time to switch to the “house” nginx “mp4” module and update their mp4 module to exact video starts. Time to become contributor #56 to nginx and collaborate with some of the best C programmers on the planet [level unlocked!] Let’s hack some (dyslexia unfriendly) STTS and STSS moov atoms… Presented at Demuxed 2021.