Questions tagged [compression]

The use of identifying patterns in video to reduce the required data rate required to create a video stream.

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What causes, and how to avoid artifacts on uncompressed video?

Wondering what in particular could be causing visual artifacts on uncompressed video and how to avoid it. I am assuming it is due to the encoding, but would need confirmation as I'm not an expert on ...
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How to get rid of YouTube compression artifacts in 4K video

I'm trying to upload a 4k video to YouTube. I exported it using DaVinci Resolve without any compression (uncompressed with YUV 422 10-bit) expecting it to be in the highest possible quality. However ...
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Could someone please explain significance VIF and ADM metrices in VMAF?

I've been studying about video quality assessment metric VMAF and I know VMAF score is calculated based on VIF, DLM and Motion. I want to know in layman terms how is VIF and DLM calculated and then ...
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What is this artifact called and why is it appearing? (colored vertical glitch lines)

When seeking through an H.264 video I can sometimes see vertical glitchy lines appearing in the video. If I just play the video, this artifact is not visible. The artifact is only visible in some ...
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How can I easily shrink over-large MP4s where high quality is not relevant?

I have some smartphone video that is absurdly large for what is low-quality casual video: 100MB per minute. What is the easiest way to compress this (on Mac) using command-line or GUI, given that I ...
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ffmpeg, why down-conversion results in bigger file?

I usually reconvert my videos recorded on Android, because most of the time they can be well compressed. I mean, sometimes 150Mb becames 50Mb or even better, sometimes just a few megabytes gets saved. ...
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Suitable alternative to Quicktime RLE for alpha-containing non-cartoon videos?

I'm producing a product that involves a composition of several videos, over alpha layers, and there are surprisingly few options aside from image lists. Quicktime's RLE (Run-Length Encoding) codec ...
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Optimized Parameters of `FFMPEG` for Screen Recording

Windows has a great codec for screen recording called Windows Media Video Screen. It generates artifacts free videos which are highly compressed (small size). I was wondering, what would be the ...
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How can I build a MOV (QT-rle) file with minimal unnecessary features?

I understand that my title requires further specification, so allow me to elaborate. I recently finished a model in Blender and rendered 1000 frames to PNG with alpha. The total size was roughly 2 GB ...
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Can MKV hold multiple images in sequence (i.e. slideshow?)

Everything I'm searching for is for people who want to have their album artwork incorporated into a video. What I'm asking is if MKV can hold multiple images in succession, i.e. for videos like this ...
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What is the best format to digitalize Video8

I would like to digitalize some old Video8 tapes (e.g. SONY Video8 MP60 8 mm, single play 60 min.) Unfortunately, I do not have the time to digitalize them by myself. I found a lot of providers online....
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ffmpeg and ffprobe existing library or an add-on, pros/cons of building one myself

I work with video creation, animation, or fix video elements for several broadcasters in my area. My pipeline includes ffmpeg suite of libraries, and I have written one plugin specifically for ffmpeg ...
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ffmpeg best parameteres for fastest compression on FullHD mp4?

I need to compress a bunch of FullHD(1920x1080, 3Gb, mp4) videos, each ~2 hrs long. Some loss of quality is okay as is the lower resolution. I'm shooting for a 500Mb output video in ~10 min processing ...
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What causes the 1080p version of a video to be blocky but the 4k version look perfectly fine?

I'm a complete beginner in all things photography, video compression and YouTube uploads so please bear with me. I recently uploaded a 4k 30fps video to YouTube, and when I select the 4k option it ...
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Compress multiple videos at once on a Mac

I want to reduce the file size of a bunch of videos at once on my Mac. Would you know any free tool that does that or any way to automate a loop in Automator to pilot Handbrake to loop on a given ...
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Does YouTube accept AviSynth .avs scripts for uploading?

Without reencoding videos first? Is it possible to browse for .avs file and upload it, provided AviSynth is properly installed locally?
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Resolution loss by chromatic subsampling: is there a workaround?

I was trying to make some recordings of a game (with OBS), but it wasn't really good even with "lossless" options. Some part of the interface was just pixelated... After a while I realized ...
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What is the difference between .mts and .mp4 video files?

I know that .mts video files use MPEG-4 video compression. But why then don't they just have the .mp4 file name extension? Since they don't, this means they are not digitally nor conceptually ...
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Why does my ipad/macbook video camera quality not match logitech hd c270 quality?

I am trying to write a program that takes a video of someone's face, extracts the RGB values, and then uses the color change (imperceptible to the human eye) to map onto heart rate. When I use a ...
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Streamable Container for gstreamer with ngnix / RTSP on jetson nano

Im working on this project : https://www.hackster.io/jonmendenhall/jetson-nano-search-and-rescue-ai-uav-9ca547 At  some point I will need to mount my camera (waveshare ; IMX219-77IR) on  top of the ...
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GIF/SVG kind of compression for Video

I am looking for a solution to compress screen recording. Imagine a coding tutorial involving mostly text and windows and almost no graphics other than icons and occasional view of the wallpaper. ...
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Does exporting to lossless HEVC prevent loss when re-exporting an already exported video file?

Software: After Effects, Premiere Pro So I had a little bit of trouble with my main PC and can't get it fixed before the deadline of my client. I already had the final video ready and exported before ...
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What's the best way to visually compare codec compression?

Maybe I'm mistaken, but a long while ago I seem to have read an article about comparing videos encoded by different codecs. Basically what I think what was done, was to put them together in a timeline ...
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Decrease size of a avi video with lowest quality loss

I have been working on an animation with Blender. Further I rendered it at 24 fps at 1080p resolution. The problem is that the rendered video is around 30 seconds and has size around 4.3 GB. Is there ...
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Decrease video size post-editing

I am using a video editing software to edit my videos for YouTube. The scenario is as below: Input file size: 80mb. Input type: webm. My expectation after editing : Video size: around 100mb. (Any ...
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Video artifact removal and restoration - How can it be done? (Really?)

I have been researching this for the past couple of days, and all I could find on the subject were a bunch of research papers, a demonstration video of a model that isn't publicly available, and a ...
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Camtasia Studio video files are too big

I've been trying to export an HD video from a screen recording created with Camtasia studio, but every rendering is returning videos with 80 mb/s of bitrate, I'm setting it to 65% quality, MP4. If I ...
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Is video output in YUY2 color space lossless if the input is sRGB?

I am considering purchasing one of these: https://static.cloner-alliance.com/manual/ca-1080fl_user_manual_v1.1.pdf It claims to be able to capture "uncompressed video", but in the list of ...
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compress video for backup

I want to compress a video to store it for backup purpose. By that, I mean that I don't need to play video when it is compress format. So I don't want to lose quality or something like that, just ...
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Merge multiple video files using ffmpeg by adding multiple compress options

I would like to merge multiple video files, performing in the same time complex compressing options. How can I do that? The following ffmpeg command resulting this error: Filtergraph 'scale=1280:...
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ffmpeg compress video in fast motion in high quality

I would like to compress a video and in the same time to be in fast motion, and this must have as a result a high quality fast motion video. I tried to run this ffmpeg command which compress video ...
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Compressing video recording- file gets bigger!

i have recorded a part of my screen (2624x1714, 8 hours, ca. 30 GB), then trim and cut in final cut pro. Now I want to compress it with Compressor. I set the output to HD 1080p but the file doesn't ...
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Why has grayscale a higher bitrate than YUV with H.265/HEVC?

For compression purposes, I am re‐encoding a grayscale video to the H.265/HEVC codec. Although the input video is more or less perfectly grayscale in aspect, it is provided in the yuv420p pixel format....
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Is there any AI upscale tool for videos?

I’m working on an amateur project, and for part of my project I’ll be using some old, really, really low-res film. I’ve used some free online tools (like deep-image.ai) to upscale low-res photos ...
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Tipps on streamlining my recording and editing process

So i was having problems with editing videos and got some good tips here. For more Context: Original question and it got me thinking on maybe streamlining my process a bit, maybe i can get some ...
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Producing small H.264 files with Adobe Media Encoder vs ffmpeg/libx264

I am a terrible ignoramus in the subject, but the coronavirus has thrown me in the business of producing videos with my lectures. I care a bit for video quality and a bit more for small size. My ...
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Shooting short clips vs. cutting long clips

Say I want to create several short clips with the original encoding of a certain camera. Do I have to shoot the short clips directly or can I shoot a long clip and then cut it up using ffmpeg with the ...
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How to clean up old animated footage?

Recently I ripped a couple of old DVD's to preserve them. The original rip has a resolution of 720*576 and runs with 5100kb/s on 25fps interlaced. I tinkered around with Handbrake and (hopefully) ...
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h264 compression keeps same number of frames?

I'm trying to understand how h.264 compression works. So far I have clear what I, P, and B frames are and how are they used. But I'm unsure of is if after this process the number of original input ...
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Efficiently compressing a looping video with h264

I have a video that is initially 19 frames long and lasts for about 0.5 seconds, it's 432kB. I've looped it over three minutes and the resulting file is quite large (200MB). Using FFMPEG is there a ...
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What is a cost effective app to resize, crop & save a MOV file to a reduced size?

I am planning to buy an HD animation which is over 500Meg in size. I need to resize, crop and reduce the file size to about 10Meg. I prefer not to deal with Adobe Media Encoder or something like ...
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Camera flash produces unwanted artifacts on the video

During frame by frame watching of some video taken via Instagram app one noticed strange unwanted artifacts on the video caused by camera flash. Please, consider below several sample image frames ...
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error editing a long video using VirtualDub2

I have several long video files that I need to edit (remove some initial parts, breaks and dead moments) and I always got errors when I try to save / export the edited file in mp4. The pcm_f32le: ...
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Is there a tool that lets me cut video with frame precision?

I'm able to use Avidemux with enough ease and it's mostly enough for my video need. I can also choose codecs to recompress the video. Unfortunately, it doesn't let me cut video outside the scope of ...
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How to prevent frame smoothing (i.e. get really sharp frame images) when making a video with ffmpeg?

I have been digging around here and on the ffmpeg site trying to find some commands to use to generate a movie from a set of images. The command I tried that gives me a video I can watch on my MacBook ...
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Streaming Compression Math

Using 4:2:2, the data rate and compression are: 4k -- 11.88 Gb/s -- 339.4x HD -- 2.38 Gb/s -- 237.6x Assuming 4:2:0 for both, Netflix and Stadia use the same compression for HD. To use the same ...
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Why both videos are of same file size?

I am using ProMovie Recorder to record high quality videos using iPhone X, and I noticed a weird thing today. Here's what I did: I recorded a 4K 60fps video for 6 seconds (HEVC encoding). I recorded ...
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Software that captures and compresses simultaneously

I'm trying to find open-source software that compresses video captured from a webcam automatically. I'm thinking of automatically compressing like in post-production. For example, compressing the file ...
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Export Frames of 10 BPC Video File with ffmpeg

I have several hundred 1080p 59.94fps 10-bit-per-channel (bpc) AVC-Intra Class 100 MXF encoded video files. I would like to extract the frames of this video file and export them to disk in a 16-bit ...
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How can I change/reduce the bitrate of AVI files using Adobe Premiere Pro CC or other tools?

I'm using Eprime and Experiment Builder which requires files in AVI format (AVI-XVid). The files are quite small already (various 2 second clips under 1mb), but are still too large which crash the ...