Weird glitchy outcome

[samb30582688]

I have an issue in adobe after effects 2019 where every time I put a clip in and the clip has missing frames it detects the frames and adds a really bad looking glitchy effect. Any solution to not get the glitches?

[Rick Gerard]

There's better than a 90% chance that you are using highly compressed MPEG (h.264) video in your project. This is a common problem. Use production quality frame-based video or transcode your consumer video to a professional format that AE and even Premiere Pro, will not have problems decompressing.

[imeilfx]

So to clarify your issue and to add what Rick said.
1. put your clip into Adobe Media Encoder
2. convert your video into good intermediate codec (mov/animation, prores, cineform)
3. put your converted footage into AE
And now - it footage is ok just work on your project and in the future just start with converting your files to mentioned codecs - that will prevent any render issues and glitches and will be less labor intensive for your CPU to playback those intermediate codecs.
But if you see those glitches in newly converted files in AE and in any other player that mean that you have many dropped frames in your footages or corrupted file (that happens sometimes in camcoders, phone videos etc. and more than often while screengrabbing a gameplay wiht some free screen capture software) and there is nothing that you can do than make a fresh recording.

[samb30582688]

Thank you guys. I will try this, but I want you to know that it isn’t he final render. It is literally when I put the clip in it glitches

[imeilfx]

Does not matter - huge compression or just corrupted frames and thats it. Try what we adviced.

[briant72761258]

Huge Thankyou for this advice! I am brand new to AE and was having the exact issue posed in the post. Use Adobe Media Encoder, I converted the low bit rate mp4 (H.264) video to Apple ProRes LT and then magically all of my video artifacts went away.

What I don't understand is why I ONLY saw the artifacts during export. At no point did the preview pane ever show the artifacts (flickering/ greenlines, screen shifting). Do you have any insight on why this happens?

[imeilfx · Accepted solution]

Compression like h264 is not staight compressed 25fps string of still images put together. It uses complicated algorithms to "figure out" what is happening in your video between keyframes, also h264 codec figures out what happens in each frame and compresses stationary parts of video (static backgrounds, flat survaces etc) more than parts where there is a movement. So long storry short - quite complicated process.
Then you are taking that heavelly compressed by compicated algorithms file and put it to After Effects - fairly complicated tool with its own compicated tools and algorithms.
You put effects on it, overlays, mattes, color corrections etc. and as a final you tell your good old CPU to figureout what is happening with that original file made with h264 (as I said - bunch of compression and computing power neded to do that) then your CPU have to put all of those comlicated effects that you used on your file and then merge those together to give you final file - in most cases also compressed with h264 so another layer of comlicated match algorithms and "figureing out" for your CPU to do.
So long storry short - there is many places that many things can go wrong.
So rule for working with AE is simpe (and most of the beginners and even intermediate users does not do that):
- always make life easier for your CPU!
What that mean? Give iu source files as simple to read as possible so for audio - wave not mp3 and for video files made with good intermediate codecs and no heavelly compressed  mp4s.

[briant72761258]

Thank you for the detailed response @imeilfx!