I have shot some 50p footage. It looks great on my PC and Sony TV but playing it on any other TV is a pain. The footage is jittery/stuttery and is not worth watching (even with motion smoothing on). Trying to convert to 50i produces not much better results. Of course if you have to give out footage to customers and they play it on a regular TV it will look horrible. Making a DVD out of it produces poor results.
So what is the point? Why not stick with good old interlaced settings (50i/60i) and get rock-solid footage.
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With any other tv you mean older tv's? And how do you play the files? With a mediaplayer or via attached USB drive?
Video output settings in a mediaplayer can cause issues. USB transfer speed also.
It depends on the specification of the TV and on the resolution and framerate and bitrate (average, peak) of the source.
With 1920x1080i25/i30 or 1280x720p50/p60 sources and average bitrates below 10Mbps you should be on the safe side even with older 'HD' TV sets.
And there is nothing wrong with interlaced sources as TV deinterlacers/bobbers are darn good these days.
Last edited by Sharc; 30th Sep 2019 at 09:36.
I would always shoot in the highest quality mode the camera supports, create a master for archiving and then author different versions for different target devices.
I tend to play the footage on the TV from a USB stick.
I have a 4 year old 55" Sony LCD TV which plays 50p really good. However, my other TV (LG 47" from 2011) really struggles and displays unacceptable level of stutter.
Yes I would like to shoot at higher quality/rate and author different versions. But how do I ship footage on USB and DVD to ensure it plays well on most LCD TVs without stutter and with smooth motion.
You have no control over how they view it - If they have 20 year old TV, or a new one that plays everything
If you want some control over how they play it - you need a standardized format such as DVD, or BD (or UHD BD)
The other option is web delivery, streaming, but if they have slow hardware - it can pose problems too
Why would shooting 60i/50i be any different than converting from 60p/50p ? 50p converted to 50i should be "just as bad" as "rock solid" 50i in the first place . The problem is that TV. At least with 50p you have other options , higher quality to begin with.
If you deliver on USB, make sure you adhere to restrictions and minimum levels such L4.1 for AVC, VBV restrictions . Most "smart" TV's in the last 8-10 years that can play AVC can play that . But if you deliver with "illegal" bitrates and settings, your risk playback problems
So my question now - if someone also requires a DVD; how do I convert that 50p footage to MPEG2 format so that it looks smooth and does not stutter?
BTW , L4.1 is probably why that older LG TV stutters. 1080p50 / 1080p60 is L4.2 . L4.1 vs. L4.2 is a major cutoff point for HW decoders. Original BD was restricted to L4.1 too.
If you have 50fps that plays horribly on another tv re-encode to 25 fps progressive,i bet it will play good on that tv.I think,therefore i am a hamster.
If your 1080p50 source is film based (ie, only 25 different frames per second) reencode it at 1080p25. If it's video based (50 different frames per second) reencode it at 720p50.
Thanks guys. I am not shooting film, only video on a Sony A7R iii at 50p. My problem is that if I have to produce a DVD also then I have to re-encode to 50i which means frames are dropped and stuuter occurs in the resulting mpeg file.
I want a quality method to transform that 50p footage to DVD compliant mpeg which plays smoothly and does not stutter or flicker.
But it could flicker, if it's not resized properly. HD has too much detail - and interlace doesn't do very well with fine details and horizontal lines. Sometimes you have to lowpass it or apply slight vertical blur before interlacing it
Which editor are you using ?
I think from what I seem to remember, if you want to encode with x264, you'll need a plugin or frameserver
adobe media encoder using the PAL DVD preset
But you have to do some tests , or have some previous experience , to decide whether or not, or how much to lowpass or not
If your details are too sharp , it's going to flicker on most displays . So one way would be to apply a slight vertical blur before exporting
But if your footage is "soft" to begin with, it makes no sense to blur it more .
However you are in trouble if the 50p video is actually 25p doubled. I am not sure you can make that smooth yourself making it 25i. Because one half of the information is missing.
One thing is sure, making it 25p won't help making it smoother.
Some TV's can display the usually shuttering 25p to look like 50p. Maybe this is what is happening in your case. Your TV plays it fine, but your friend's TV cannot do that, and reveals the true look of the video.
At first place you should examine your files whether they are 25p doubled or true 50p, and ask the experts here how to make them smooth interlaced, if it is possible.
And if it is possible converting your footage to smooth 25i, you can leave it at 1920x1080. Simply because every system that can play FullHD will play your 25i files smooth. The issue here is not whether it is FullHD or DVD, but the framerate.
It would also be worth checking your friend's system, too, in case your files are true 50p. Maybe the framerate is set incorrectly and that's why it displays 50p horribly. In that case it is a setting and not hardware issue. TVs usually get stuck on playing if they are struggling with 50p, and not start shuttering. If there is shutter, I assume your files are not true 50p. But I may not be right on this...
Anyway, all in all, if you make it FullHD25i, it is a kind of control over the vierwers, because that is a format that all FullHD capable systems can play smoothly.
Sicking to 50p is also not a problem, if the file is true 50p, but you have to consider some devices will struggle.
Last edited by Bencuri; 18th Oct 2019 at 14:56.
Thanks guys. Actually I output it in HD 25 interlaced (it knocked it down to 1447x884). But this also stutteres on the LG tv.
So the LG has problem, cannot play smooth with 50p or 25i (50i). Is it down to the fact that the tv may not have high enough refresh rate?
If we convert 50p to 25i , dont we lose lines as half of the info is discarded?
I have an LG TV. Can you post a sample of a file your having problems with ?
If the files are progressive don't encode as interlaced,encode to 25 fps progressive.I think,therefore i am a hamster.
1. Encode 1920x1080p50 , easy settings, something BD like + fast decode + medium and try to cheat with levels, setting it to 4.1 instead of 4.2
--preset medium --fastdecode --bluray-compat --vbv-maxrate 30000 --vbv-bufsize 30000 --level 4.1 --keyint 25 --open-gop --slices 4 --colorprim "bt709" --transfer "bt709" --colormatrix "bt709" --sar 1:1
, but for that you need that Voukoder plugin to encode with x264
1 alternative, same as above using Premiere 50p
2. encode 1280x720p50 same as above x264 settings
same x264 settings as above, you can use --keyint 50
2 alternative, again or using Premiere 1280x720p50 but you do not have much controls for settings
3. You can try that 25 progressive, but that will look bad, I would not spread something like that intentionally, because someone might have a playback problem.
if still you have problem, then it is TV problem, problem on user side, that 1280x720p50 should be playable by nowadays BD player anyway,
if you make a DVD , customer would think that you made a cr** anyway. It is going to turn against you.