Removing frames without converting?

[videohalp]

I want to remove half the frames in a 60fps video. The input and output video codec is the same. So I want the video to copy and not re-convert. Which editor can do this?

[pippas]

You can use Virtualdub. Open the video file. Select 'video' - 'frame rate' - 'frame rate conversion' - 'process every other frame'

Then select - 'video' - 'direct stream copy'.

Save the new 30fps file without converting

[El Heggunte]

You can use Virtualdub. Open the video file. Select 'video' - 'frame rate' - 'frame rate conversion' - 'process every other frame'

Then select - 'video' - 'direct stream copy'.

Save the new 30fps file without converting

I doubt that the suggested method would work for a frame sequence like:

display order => I B B P B B P B B P I ......

or have I missed something?

[pippas]

You can use Virtualdub. Open the video file. Select 'video' - 'frame rate' - 'frame rate conversion' - 'process every other frame'

Then select - 'video' - 'direct stream copy'.

Save the new 30fps file without converting

I doubt that the suggested method would work for a frame sequence like:

display order => I B B P B B P B B P I ......

Ah... as the OP has not detailed any particulars of the video, I have sort of assumed an all keyframe format. Probably a mistake on my part then.

I shall be interested to see what recommendations are made to halve the frame rate of a long GOP clip, without re encoding....

[jagabo]

Generally, you can't remove every other frame from an inter-frame encoded video without reencoding.

[Cornucopia]

Which "half"? The first half? Last half? Middle half? Alternate halves? And what is the format in use?
We cannot give you clear assistance until you give us the full info.

Scott

[budwzr]

It's probably 60p coming off a 30p sensor so it has frame repeating. Panasonic used to do that.

[videohalp]

Video is MP4. Want it to be 30fps.

VirtualDub will not recognize MP4.

So what editor can do this?

[jagabo]

Video is MP4. Want it to be 30fps.

MP4 is a container. It can contain video compressed (or not) with any of a number codecs.

VirtualDub will not recognize MP4.

Yes, it does. All you need is an appropriate import filter. You could use the ffmpeg, mp4, or DirectShow, import filters. The VirtualDub page here links to them.

So what editor can do this?

Guessing that your MP4 file has h.264 video at 60 fps, and you want to decimate to 30 fps, VirtualDub will not be able to do that without re-encoding. Nor will any other program.