Avidemux Forum

Avidemux => Main version 2.6 => Topic started by: Vygantas on February 17, 2019, 08:59:29 AM

Title: Why are some video files so jumpy in frames?
Post by: Vygantas on February 17, 2019, 08:59:29 AM
Hi there, when editing 30 or 10 seconds videos, sometimes there are parts where I can only jump (as starting point) from 1st sec to 6th, etc (using jump by frame option). Making it hard to cut videos with a specific length in might, it's either 14 seconds or 24, etc. but can't be 20

Is this something that can be improved in future builds?

v271v2
Title: Re: Why are some video files so jumpy in frames?
Post by: eumagga0x2a on February 17, 2019, 12:59:46 PM
No, this is already an improvement over a total failure to advance in a video when undecodable / broken frames are encountered, implemented by [editor] Try to continue from the next keyframe if decoding fails (https://github.com/mean00/avidemux2/commit/275071a80a5878f2a6e2e10e8472ed3d7612230d) from 2018-05-18.
Title: Re: Why are some video files so jumpy in frames?
Post by: eumagga0x2a on February 17, 2019, 01:08:30 PM
In doubt, please provide a video exhibiting this problem during frame-stepping as a sample using WeTransfer, Mega, Dropbox, Google Drive or a similar service.
Title: Re: Why are some video files so jumpy in frames?
Post by: Vygantas on February 17, 2019, 07:14:16 PM
Tried to post, but got rejected by filter. Let me repost with edit button

--

Hi, here are two videos, both can be split at around every 8 seconds only, please note: these are NOT SAFE FOR WORK GIFs, meaning content for adults.

<links to samples removed>


Title: Re: Why are some video files so jumpy in frames?
Post by: lodger on February 17, 2019, 07:59:33 PM
 ;D  ;D  ;D
Title: Re: Why are some video files so jumpy in frames?
Post by: eumagga0x2a on February 18, 2019, 12:41:52 AM
I misunderstood "jump by frame" as "step by frame". What you obviously meant is called "seek to keyframe" or "keyframe-based navigation".

There is nothing wrong with the samples from video-technical point of view. If you want to keep visual quality (copy mode), you must set cut points at keyframes. If you re-encode, you can set cut points at any frame you like. This is a fundamental limitation based in the very nature of video compression.