Change FPS

[maza1967]

I want a codec that can change the fps of my video from 30 to 25, 20, 15 or 10. I tried autox264 but I don't see how to change the fps. Help.

[manono]

What kind of video? And you're asking how to remove half the frames or more? And make it play real jerky? Any particular reason you want to ruin the video?

Or are you asking how to slow it down from 30 to 25 to...? You're not real clear about what you want. For example, if it's an AVI, VDub can just slow it down without reencoding. Of course, the audio will no longer be in synch with the video.

[maza1967]

I took some videos using my IPHONE. The video properties are as follows: 640x480, frame rate=30, Coded: V_MPEG4/ISO/AVC. The data rate is in the order of 3-4Mbps. I want to reduce the data rate and see the impact on the video quality. In particular, I want to change from color to monochrome; reduce the fps from 30 to 25, 20, 15, or 10; remove audio; and make the maximum bit rate fixed at some value (300kbps to 500kbps).

I need a codec that I can use to load the original video stream and adjust the parameters above see the impact on the video. Can you recommend a codec that can do what I want? Appreciate you help in this matter.

[guns1inger]

Doesn't exist.

Changing from colour to monochrome requires re-encoding. Has nothing to do with the codec.

Reducing bitrate requires re-encoding. Nothing to do with the codec.

Removing audio can be done with AVI Demux. No re-encoding of video required. Nothing to do with the codec.

AVI Demux can also change the franmerate without re-encoding, however this will just have the effect of changing playback speeds. To do this properly requires re-encoding (and will affect the smoothness of playback). Nothing to do with the codec.

Most of this is moot. The only way to reduce the size is to reduce the bitrate. A video that has a resolution od 320 x 240 and a framerate of 15 fps and a bitrate of 3000kbps will be the same size as a video with a resolution of 640 x 480 and a framerate of 30 fps with a bitrate of 3000 kbps.

[maza1967]

I agree with you.

Let me state a different question. What re-encoding software do you recommend? I don't mind paying if nothing free is available. Having a rich set of parameters to modify is of interest to me.

Thank you for your help.

[jagabo]

Try AviDemux or VirtualDub.

[maza1967]

Wow! Avidemux is exactly what I was looking for. Thank you.

[maza1967]

Question: I'm looking for a software that will enable me to view to video streams side-by-side. Does anyone have any suggestions?

Thank you in advance.

[jagabo]

Question: I'm looking for a software that will enable me to view to video streams side-by-side. Does anyone have any suggestions?

Thank you in advance.

You can use two players. Or use AviSynth and it's StackHorizontal() or StackVertical() commands. StackHorizontal() requires that they be the same height. StackVertical() requires that they be the same width. If necessary you can use AddBorders() to make the sizes match.