MP4 h264 video at 50 FPS! How is it possible?

[alexVS]

I just have seen a clip. I think it was hockey game clip captured from TV. Then encoded in MP4. The quality is amazing. But the most amazing thing is that clip has 50 FPS as Media Player Classic shows.

How can it possible? Well I believe that it really has 50 FPS because the video is very smooth.

http://2007.russian-hockey.ru/video/IHWC_2007_07.05.07_SWE-RUS_1-0.zip

[Dark Shikari]

It was probably 25 FPS (PAL) interlaced, and he interpolated the fields into frames to get 50 FPS.

[Dark Eiri]

720p PAL can be (most likely it is) 50fps. Just like 720p NTSC can be 60fps. Nothing unusual =/

[alexVS]

It was probably 25 FPS (PAL) interlaced, and he interpolated the fields into frames to get 50 FPS.How can it be done? MeGUI hasn't such options. Therefore some string shoud be added to .AVS?

[Dark Shikari]

How can it be done? MeGUI hasn't such options. Therefore some string shoud be added to .AVS?
Not everyone in the world uses MeGUI you know :p

[alexVS]

Why not? I'm sure Sony Corp. encodes it's blue-ray and HDDVD only in MeGUI :)

Can you advice something better for me and ... well ... for them? :)

[mitsubishi]

You don't have to use the avs creator in meGui, and even if you do there is an edit tab at the end so you can alter the filters to your choosing.

Anyway isn't 720p broadcast at 50FPS anyway usually?

[arfster]

All European HD is in 1080i50 h264. Makes football look really nice.

[PuzZLeR]

This is not that new, especially in sports.

Actually, this type of higher framerate tech has been around for over two decades now, and made its debut AFAIK in sports.

It was introduced in the 80s as "Super Motion" (or something like that) and it was very beautiful visually when showing a slow-motion instant replay, which for the longest time was very limited to chopiness with traditional framerates of 25fps and 29.97fps. This type of tech would be very effective in providing the extra details between frames that were otherwise visibly lost with the lesser rates when moving video slower.

It was a hit when it first came out, but at the beginning I remember it was so expensive for the stations to use this equipment that it was only used back then for important big-ticket, high-ratings, stuff like playoff games and finals.

[plonk420]

All European HD is in 1080i50 h264. Makes football look really nice.

720p50 would actually "look better"

[arfster]

Not sure that's necessarily true now with the latest advances in deinterlacing. With things like football or tennis, where there's mostly a single scene with elements moving around on it, the processor can compensate extremely well for lost vertical resolution by analysing the vectors etc. A simple bob would mean 1920*540 50fps, and even that's slightly more pixels than 720p50 (+12.5%), but it's possible to recover yet more detail than that from adjacent frames.

This doesn't apply to most set-top boxes though, which have garbage deinterlacing. However if you get the latest ATI 2400/2600 cards, and run 1080i50 through them, the picture with sports is spectacularly detailed.

[alexVS]

In ideal circumstances (if you have HDTV 50p) perhaps it's easy to encode video to MP4 50FPS. Though I don't know what program should be used to encode at 50FPS h264

But I don't have HDTV. But I like idea of second post It was probably 25 FPS (PAL) interlaced, and he interpolated the fields into frames to get 50 FPS.Any Idea how to do this?

[RaynQuist]

Some avisynth deinterlacers give you the option to double framerate

[Jay Bee]

In ideal circumstances (if you have HDTV 50p) perhaps it's easy to encode video to MP4 50FPS. Though I don't know what program should be used to encode at 50FPS h264

But I don't have HDTV. But I like idea of second post Any Idea how to do this?

I can't tell if the source of your clip is PAL or 720p50 or 1080i50. But if it is PAL or 1080i the most efficient way to encode the video is to just keep it interlaced and let the deinterlacer create the smooth 50 fps motion during playback. The problem with this approach is that interlaced support is still quite poor for MPEG-4 codecs on PC although it is getting better with the newest generation of GPU's. In fact I'm still using MPEG-2 for encoding because decent interlaced AVC decoding needs either Vista and a new GPU or a certain decoder that is poorly supported and not ready for mass adoption.

If you want to go to 50 fps before encoding you should use an Avisynth deinterlacer. Leakkernelbob is very fast, MVbob is very high quality (google them).

[ronnylov]

All European HD is in 1080i50 h264. Makes football look really nice.

There are 720P 50fps HDTV channels in Europe.
At least one I know is SVT HD.