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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15 views

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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24h screensaver - how to handle huge video

I'm tasked with creating a windows screensaver that display a 24h video. The original 24h HD video is 180GB As I see it there are 2 strategies Caching I could split the video into smaller parts (...
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17 views

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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16 views

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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22 views

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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Reducing pixel dimensions and frame rate does not reduce video size (Adobe Media Encoder)

I have created a video using After Effects which is about three minutes long and has a size of 86MB after exporting as h264. This seems quite an appropriate size for a good quality video to me. ...
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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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Poor Capture Quality with Camtasia

I build video tutorials. I need to capture video in raw high-quality format so I can hand it to the editor. But, when I record video in Camtasia 2019 or 2020 (new version), the editor complains that ...
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how to store and playback segments of video in different fps?

I am working on video compression techniques and was trying to segment the video into important and unimportant parts. Unimportant parts are stored in 30 fps and important parts of the video are ...
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How to export 20fps footage

I am trying to export a video stiched together with 20fps footage, my quick solution was just to export at 60fps but that leaves me with huuuuge files. Any workaround? Premiere doesn't seem to let me ...
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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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409 views

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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271 views

Green frame in iMovie export

I exported a movie from iMovie from a theater play of about 1 hour. By chance, I found that one of the frames was completely green: whereas the other frames are mostly black or dark. The settings ...
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32 views

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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31 views

Hardware Acceleration Compression (ffmpeg H264 .mov files)

I'm looking for a (preferably hardware) solution for quickly compressing ffmpeg H264 .mov files. The setup I have has several Edgertronic cameras that are controlled through an API (start, stop, ...
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Compressed file video quality [duplicate]

there are many parameters in a (compressed) video file: resolution, bitrate, codec, etc. How can we check the overall quality of a video? I know this would be a nasty question, simply due to the ...
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3answers
28 views

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 Handbreak and (hopefully) ...
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90 views

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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48 views

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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1answer
14 views

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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1answer
53 views

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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160 views

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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1answer
29 views

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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125 views

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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27 views

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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1answer
124 views

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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1answer
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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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1answer
469 views

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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1answer
158 views

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 ...
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2answers
502 views

What's the difference between “visually lossless” and real lossless and what does this mean for future encodes?

In FFmpeg's H.264 Video Encoding Guide we are told: Tip: If you're looking for an output that is roughly "visually lossless" but not technically lossless, use a -crf value of around 17 or 18 (you'...
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119 views

Some H.264 videos that I have seem to have excessive bitrate, is there a way to determine/find their recommended bitrate?

So I have some videos that are Full HD, h264 but they have over 30M bitrate at 30 FPS, they are SDR and their quality is not very impressive so it seems excessive and unnatural for such unimpressive ...
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381 views

Recompressing 1080p h264 collection to HEVC - Target Bitrate For Minimal Loss

My understanding is that HEVC (aka h265) can provide roughly the same video quality as h264 in roughly half the space, for 1080p+ footage. I have a large collection that I would like to re-encode to ...
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1answer
305 views

What happens when you use a specific CRF value on a already encoded x264 video?

If there is a h.264 video, and I use -crf 17 I sometimes I get a lower bitrate, but the weird thing is - most of the time get a higher ones. I am trying to get this setting because I think some ...
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462 views

ffmpeg clear video cache

I am running a compression script to compress my large AVI files to small mp4 files. The script look like this #!/bin/bash FILEPATH="$1" COMPRESSIONPATH="$2" ffmpeg -i $FILEPATH -vcodec h264 -acodec ...
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Before I throw away these massive uncompressed VHS digitizations, what kind of post processing can I do to improve them?

An uncompressed digitized VHS tape is like 60 gigs. Obviously way too big. I can compress it down using H.265 and get basically the same quality. But before I do that, is there any production ...
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ffmpeg video compression : Compress captured video being before saving to file

Is there a way one can compress captured video input before saving to file? I have raspberry pi that I am using to record youtube videos. 1-2 min video takes over a Gb of space. I cant compress the ...
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1answer
43 views

What happens when a compressed video is played back?

I've been reading up on video compression. I understand that 'raw' media file sizes are to big for practical usage so they have to be compressed, but I'm wondering what happens when the video is being ...
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1answer
91 views

MJPEG Streaming

in https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Video/pktvideoaag.html it says: Another type of video compression is MJPEG … the resulting video stream is larger but the packet sizes ...
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48 views

mp4 to wmv AND file compression

I have a mp4 from a video created in iMovie 10. The original output is about 1.5 GB. I uploaded it to youtube to use their compression and re-downloaded. I now have an mp4 at 236mb. I need to ...
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2k views

Using ffmpeg to add height (as black bars) to video file without quality loss

I have a file of resolution 3840x1632, but my TV stretches the picture vertically to fill up all 2160 pixels of height. Is it possible to use ffmpeg to add blank / black height, while preserving the ...
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2answers
224 views

Grime-like blocking compression artifacts on the decompressed video (H.264)

During watching H.264 compressed videos one faced several times with an artifacts. Example 1: Example 2: Wikipedia's article [1] tells that the typical reason is «Data errors in the compressed bit-...
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Why does people seem transparent in this video

People seem transparent in that video. What does explain that? I posted on the Physics community, believing that it was related to some optical effect. But I've been told that it may be related to ...
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52 views

Video cam with poor compression ratio (H.264 produces videos at 2.9MB/sec)

I just purchased a cheap dashboard video-camera that is advertised to have a H.264 codec inside. However, after the first video test I have seen that a 43sec movie takes 123MB! How is this possible. I ...
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Why does motion compensation need a decoder?

I know that motion compensation is the process of using the motion estimaton MV information and then compensating it to describe only the differences between reference frame and the motion estimation ...
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120 views

Different rate distortion curves for two videos encoded with same parameters in FFMPEG

I encoded two videos (ParkJoy and Sintel) in FFMPEG by H.264 with same parameters (GOP size, QP, frame rate, resolution etc.) and obtained rate-distortion plots (mean PSNR of Y channel vs bitrate). I ...
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2k views

How do I avoid objects having flickering edges when I encode a screen recording to mp4 using x264 and ffmpeg?

The Goal I'm creating short tutorials by recording my screen (720p30fps). The content is just a recording of using some desktop software - so mouse moving and opening dialogs, typing, drawing shapes, ...
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400 views

Lossless and lossy compression techniques

Are MPEG and H.264 Lossless?? I need a brief explanation about lossy and lossles... And which compression technique is generally using in CCTV Surveillance applications of video??
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Optimizing HTML5 video for best quality

I have a 3 minute video I'd like to embed on a web page. The problem is that despite best efforts, the file size of the video ends up being over 30 mb. I would like the size to be near 10 mb. I have ...