avidmux

[rahulcrazy]

Hello,

I video i want to delete some part from video.

i open video in avidmux video copy audio copy.

than i set point A B deleted that part.

Massage while saving:-

the video is in copy mode but cut point are not on keyframe.
video will be saved but there will be Corruption at cut points.
do you want to continue.

how can delete this part without converting video to other mode.
video is compressed with handbreak. original video format is wmv format. after convertion mp4 format.


guide me.

[hech54]

The only way to cut losslessly is to cut on keyframes.
The End.

[ricmetal]

on the bottom of the program window says i-frame, b-frame.
one of those types is a keyframe - i dont remember wich one

[newpball]

on the bottom of the program window says i-frame, b-frame.
one of those types is a keyframe - i dont remember wich one

Easy to remember:

The "I" stands for interspersed. An i-frame contains a full frame of information, they are key frames.
The "P" stands for predicted. A p-frame only records the chances wrt a prior frame.
The "B" stands for bi-directional. A b-frame is basically a p-frame but predicts in both forward and backward direction.

The more I frames the better your compression will be.

[rahulcrazy]

I did not find I P B.

I dont have much knowledge of avidmux.

can explain in simple language..

[newpball]

I did not find I P B.

can explain in simple language..

A picture paints a thousand words:

[ricmetal]

on the bottom of the program window says i-frame, b-frame.
one of those types is a keyframe - i dont remember wich one

Easy to remember:

The "I" stands for interspersed. An i-frame contains a full frame of information, they are key frames.
The "P" stands for predicted. A p-frame only records the chances wrt a prior frame.
The "B" stands for bi-directional. A b-frame is basically a p-frame but predicts in both forward and backward direction.

The more I frames the better your compression will be.

good to know.
would be better if they use k- for keyframes
but non the less

[newpball]

would be better if they use k- for keyframes

Well you know, engineers.

[ricmetal]

would be better if they use k- for keyframes

Well you know, engineers.

yeah
all brains for one things, no brain for others

[jagabo]

I stands for intra-encoded -- a frame which can be fully reconstructed without reference to any other frames.

[rahulcrazy]

I did not find I P B.

can explain in simple language..

A picture paints a thousand words:


[Attachment 30766 - Click to enlarge]

Thanks i loaded file now it shows frame type I-FRM(00)

now what to do?

[jagabo]

Cut on the I frames.

[rahulcrazy]

frame i want delete so i have to set point A and B. Than delete.

Massage while saving:-

the video is in copy mode but cut point are not on keyframe.
video will be saved but there will be Corruption at cut points.
do you want to continue.

does this effect file saved miss audio video problem.?

[jagabo]

If you don't want to reencode the video you need to make all your cuts on key frames. If you can't live with those cut points you'll have to reencode the video.

[ricmetal]

what jagabo said. you have to set point A and point B on i-frames. you can move the video forward and backwards to find the i-frames using the arrow keys when the video is stopped. for example, you set the A point, check if it is an i-frame. if its not, then use the arrow keys to go forward (or backwards) a few frames to find an i-frame. when you do find an i-frame set the A point on that frame. same with point B.
if the selection of the video is not what you intend then you need to re-encode. don't ask we to what you will re-encode though. i haven't needed to re-encode video as all editing i do is on lossless video - so all frames are i-frames.
and yes, the error message says there will be corruption so yeah there might be corruption with audio and video.
btw jagabo to what format should the video be re-encoded to, to have more choice of i-frames?

[rahulcrazy]

OK..
thanks to all will try ricmetal suggestion.

[hech54]

what jagabo said. you have to set point A and point B on i-frames. you can move the video forward and backwards to find the i-frames using the arrow keys

NOT true. Only the >> keys are the key frames.

[ricmetal]

what are the >> keys?
using the keyboard arrows and moving to i-frames won't guarantee being able to cut the video without problems?
im thinking that is what i did once.

[hech54]

Are you serious? You can't find something that looks like >> on your screen?

[jagabo]

Those aren't keys, they're buttons. My keyboard doesn't have >> and << keys.

ricmetal, what hech54 is referring to is IDR frames vs. I frames in h.264. IDR frames are keyframes at the start of a GOP, a picture encoded much like a JPG image. Frames after an IDR frame cannot reference frames before the IDR frame. There are "internal" (in the middle of a GOP) I frames, also encoded as full images. But frames after those I frames can reference frames before it. So you cannot cut on those I frames without risking corruption.

[ricmetal]

ok then, use the buttons to look for cuttable keyframes and dont use the i-frames
got it
i dont remember if i had problems cutting on the i-frames but i think i was able to.
anyway then yeah, op, search for the keyframes using the buttons instead.
thanks for the clear up
and yeah keys are not buttons man

[hech54]

We are not looking for things called "button frames" either so what's your point?

[ricmetal]

we are looking for frames in a video called key frames
what we are trying to achieve has nothing to do with how you achieve it

[hech54]

Alicia Keys has a nice belly button.....but:

The only way to cut losslessly is to cut on keyframes.
The End.

[rahulcrazy]

thanks to all.