Started by seriousgigi, June 02, 2017, 07:51:57 pm
Quote from: eumagga0x2a on June 02, 2017, 09:57:51 pmYou can start and end the cut at any point if your reencode video and thus lose quality (edit: maybe you don't know how to seek/navigate in Avidemux?).You must start the cut at a keyframe and end it preferably at an I-frame or at least at a P-frame if you use the copy mode, preserving the quality.This is a fundamental limitation of video compression.
Quote from: seriousgigi on June 02, 2017, 11:05:22 pmso proper cut can be made in p frames, did i understand right?
Quote from: eumagga0x2a on June 03, 2017, 08:19:59 amNo, I-frames. The end point of every segment (if you save from A to B, then B; if you delete from A to B, then A) may be a P-frame (in most cases this will work), but with I-frames you are on safe ground (unless a bug in software steps into action ;-)). The start point of every segment must be an intra (I-frame).
Quote from: acritum on June 04, 2017, 05:33:15 amA couple of days ago I converted many videos of my bike trips in Avidemux into MP4, H264, rate factor 29, "super fast" preset. Then I decided to divide these videos into sections and I found a strange thing. In most cases, if I move the marker with UP/DN keys to I-frames, the cropping is made correctly, but in one case it was made wrong. [...] The saved selection lacked the initial I-frame
Quote from: eumagga0x2a on June 04, 2017, 08:46:37 amThis is an old, known bug, which is finally mostly understood (hurray!) and partially fixed by [editor] In copy mode, be more tolerant to timing error, allow 0.3 rather than 0.1 , that helps with dropped keyframes so it doesn't strike that often. We're at it currently.
Quote from: topinrouen on June 22, 2017, 10:45:39 amI don't understand what is said below "be more tolerant to timing error, allow 0.3 rather than 0.1 ". How to be more tolerant ? What does it mean ?
Quote from: eumagga0x2a on June 22, 2017, 11:47:18 amFor more in-depth analysis of a particular case: please provide a sample with steps to reproduce.
Quote from: topinrouen on June 23, 2017, 10:21:27 amSo I put a label [A] at time 0:00.00.400 (on the I-Frame) and a label [noparse][/noparse] at time 0:00.03.480 ( the B-Frame just afer the P-Frame). I just want to copy (with reencoding) and save the file as a mkv.