Questions tagged [compression]
The use of identifying patterns in video to reduce the required data rate required to create a video stream.
33
questions with no upvoted or accepted answers
5
votes
1
answer
2k
views
Largest input image size when encoding a video?
I got a bunch of really large 16 bit videos, approaching 65535×65535 pixels in size. These are essentially high quality timelapse panoramas. I want to convert them to a 7680×4320 movie (8K UHD, 8 bit)....
- 173
3
votes
0
answers
63
views
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 ...
- 131
3
votes
1
answer
410
views
AVI Capture in VirtualDub: MP3 Compression
I would like to capture my old VHS tapes to my HDD. I already was successful installing the xvid codec which gives me an acceptable video compression.
But somehow I am not able to set audio ...
- 173
2
votes
0
answers
333
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 ...
- 121
2
votes
0
answers
85
views
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 ...
- 121
1
vote
0
answers
21
views
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 ...
- 11
1
vote
0
answers
37
views
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 ...
- 11
1
vote
0
answers
984
views
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....
- 111
1
vote
1
answer
1k
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 ...
- 91
1
vote
0
answers
200
views
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 ...
- 51
1
vote
1
answer
71
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 ...
- 11
1
vote
0
answers
28
views
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 ...
- 11
1
vote
0
answers
12
views
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 ...
- 11
1
vote
0
answers
152
views
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 ...
- 121
1
vote
0
answers
208
views
Best possible quality setting for screen recording (not games) and web presentation
Screen videos have text and simple geometric shapes, which need to
stay sharp, detailed and crispy. The color should also remain
untouched. With screen grabs, I want e.g. IBM blue to show as IBM blue
...
- 111
1
vote
0
answers
576
views
If I limit the color spectrum of a video, will it compress to a smaller file size?
I know that in exporting images, if I use an indexed color format when I save (such as GIF or PNG with indexed color mode), I can dramatically reduce the file size of the resulting export. My ...
- 111
0
votes
0
answers
23
views
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 ...
- 101
0
votes
0
answers
9
views
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 ...
0
votes
0
answers
8
views
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 ...
- 149
0
votes
0
answers
10
views
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.
...
- 101
0
votes
0
answers
24
views
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....
- 123
0
votes
1
answer
128
views
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 ...
- 101
0
votes
1
answer
242
views
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 ...
0
votes
0
answers
38
views
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?
- 101
0
votes
0
answers
25
views
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 ...
- 101
0
votes
0
answers
645
views
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 ...
- 103
0
votes
1
answer
483
views
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 ...
- 101
0
votes
1
answer
372
views
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 ...
- 163
0
votes
0
answers
12
views
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 ...
0
votes
1
answer
227
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 ...
- 1
0
votes
1
answer
402
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 ...
- 1
0
votes
0
answers
4k
views
FFMPEG Tiff images to losseless video (H265) lags, broken output
I have 226 sequenced images (TIFF, 6.2MB each) and i would like loseless save them like video by using H265.
Here is command which I used:
ffmpeg -f image2 -framerate 25 -i IMG_%03d.tif -vcodec ...
- 1
-1
votes
1
answer
15
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 ...
- 101