Questions tagged [compression]
The use of identifying patterns in video to reduce the required data rate required to create a video stream.
156
questions
0
votes
1
answer
18
views
What improvements can I make to my FFMPEG script?
I am trying to create an FFMPEG script for some of my emulated game captures. I normally use Virtualdub2 (formerly Virtualdubmod) to upscale and trim my game captures for YouTube. With my laptop gone ...
- 704
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)....
CommunityBot
- 1
2
votes
1
answer
12k
views
My converted videos look bad... what am I doing wrong?
I am a software developer. I understand the video concepts, but I am no expert.
I have a Sony Action Cam AS-15. It records ate 1080/60fps/25Kbitrate. The 60FPS videos just dont; play smooth maxemised ...
- 101
4
votes
1
answer
825
views
How to compress videos for a website?
I want to start a website in which there are some videos. When I searched Google regarding this video website I came to know that for the proper working of the videos we should compress the videos. ...
- 101
0
votes
1
answer
316
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 ...
CommunityBot
- 1
1
vote
1
answer
1k
views
What is the difference between .mts and .mp4 video files, and which is better to edit?
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 ...
- 199
0
votes
1
answer
452
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 ...
CommunityBot
- 1
0
votes
0
answers
19
views
ffmpeg, why does down-conversion result in a bigger file?
I usually reconvert my videos recorded on Android, because most of the time they can be well compressed.
Sometimes 150Mb becomes 50Mb or even better, sometimes just a few megabytes get saved.
But ...
- 129
1
vote
1
answer
285
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 ...
CommunityBot
- 1
0
votes
1
answer
8
views
Image sequence format for working with Blender and Apple Compressor
Previously, I rendered a 3D animation in JPEG-2000 format, thinking that Preview supports it, so apple pro apps must also support it, but it turns out, compressor can't take J2K image sequence and ...
CommunityBot
- 1
0
votes
1
answer
5k
views
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 ...
0
votes
1
answer
425
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 ...
CommunityBot
- 1
0
votes
1
answer
270
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 ...
CommunityBot
- 1
0
votes
1
answer
573
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 ...
CommunityBot
- 1
3
votes
1
answer
423
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 ...
CommunityBot
- 1
1
vote
1
answer
72
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 ...
CommunityBot
- 1
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 ...
CommunityBot
- 1
1
vote
2
answers
25
views
How do I avoid noise when speaker is further away?
When the speaker is further away from the microphone, noise gets louder as (that is my assumption) the compressors wants to compensate for the missing loudness.
An audio sample can be found here:
...
- 131
1
vote
1
answer
2k
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 ...
- 51
0
votes
0
answers
16
views
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 ...
4
votes
0
answers
108
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 ...
- 141
0
votes
0
answers
153
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
29
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 ...
1
vote
2
answers
84
views
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 ...
- 111
0
votes
0
answers
60
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 ...
- 169
0
votes
1
answer
89
views
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 ...
- 4,394
0
votes
1
answer
99
views
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 ...
- 150
8
votes
3
answers
49k
views
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 ...
- 330
1
vote
0
answers
41
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
1
answer
1k
views
x265: Is it possible to re-compress HEVC video without quality loss?
My situation:
Transcoding 1080p bluray videos to HEVC. Audio untouched;
My rig is old (pre-2012) and to speed up the process I'm using --preset ultrafast;
From x265 documentation, I understand that ...
- 209
7
votes
3
answers
4k
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 ...
- 209
9
votes
2
answers
1k
views
Video codec for simple animation?
I am generating an animation in Matlab, composed of simple diagrams. The images are characterized by fine structures, strong contrasts and mostly discrete colors, e.g. there are few-pixels wide black ...
- 7,267
0
votes
1
answer
148
views
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 ...
- 201
2
votes
2
answers
93
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 ...
- 220
0
votes
1
answer
273
views
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 ...
- 7,267
6
votes
4
answers
2k
views
Is there a way to improve quality for videos with snow/confetti/LCD in background?
The effect I'm referring to:
Essentially, the snow/confetti in the shot means lots of motion, hence a lot of the available bitrate is taken up by it, thereby ...
1
vote
1
answer
168
views
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 ...
0
votes
0
answers
45
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
28
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
1
vote
2
answers
3k
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 ...
- 11
0
votes
1
answer
808
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 ...
- 1
0
votes
0
answers
706
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
1
vote
1
answer
16
views
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.
...
- 19
1
vote
0
answers
61
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
3
votes
3
answers
4k
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'...
- 131
1
vote
3
answers
141
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 Handbrake and (hopefully) ...
- 7,267
1
vote
1
answer
81
views
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 ...
- 704
0
votes
1
answer
19
views
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 ...
- 1,404
1
vote
1
answer
50
views
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 ...
- 1,391
0
votes
1
answer
432
views
Compressing a large MP4 file that is on 2.30mins long
I have been sent a video that is only 2.30 mins long. But is a whopping 168mb, unfortunetely this has to be embedded into an app - so I need it as small as possible. I need to get the file size down ...
CommunityBot
- 1