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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7 votes
1 answer
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Will Compression/Format of Audio Change when Uploaded to YouTube?

If I have a .wav audio file, put it in a video file, say a .wmv, as, if I'm not mistaken, that format basically just uses .wav for its audio, and upload said .wmv file to YouTube, will the compression ...
user2649681's user avatar
7 votes
1 answer
3k views

Techniques for compressing a slideshow presentation video?

I often do QuickTime screen recordings of slideshow presentations (e.g. Keynote). These videos are 1080p 60fps and mostly text. They can go for minutes at a time with the same exact frame on-screen (...
Sean Moubry's user avatar
9 votes
3 answers
11k views

YouTube Compression: Why?

There's a lot of advice on the internet on encoding settings to apply to your video before uploading to YouTube (https://support.google.com/youtube/answer/1722171?hl=en, ...
Peter Lake's user avatar
8 votes
4 answers
221 views

Sources to learn more about Audio/Video compression, codecs, algorithms etc.

I was quite surprised when I learned the fact that the MP3 codec is extensively based on the Fourier Transform. I'd like to learn more about these topics in general. When I say more I mean the working ...
Bernhard Heijstek's user avatar
7 votes
3 answers
5k 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 ...
Rosella's user avatar
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7 votes
2 answers
14k views

How to convert an MTS file without loosing quality?

I have shot some videos on a Panasonic v720 camcorder. The videos are huge. I used the internal feature of the camcorder to convert to MP4 and the quality was reduced very much. What is the best ...
Bick's user avatar
  • 183
6 votes
2 answers
20k views

Reduce render file size in After Effects

I am making a simple travel map, like the one in the Indiana Jones movies. I followed this tutorial: (German) When I want to save it as a video (render it), the ...
Mat's user avatar
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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 ...
subuleech's user avatar
4 votes
1 answer
52k views

Big difference in the video file size after the conversion (.mov to .mp4)

After converting from .mov into .mp4, a video file is greatly reduced in size (.mov - 75,2mb .mp4 - 11,9mb) - does this mean that the converted video degraded (loss of color information, or the ...
Rumata's user avatar
  • 165
4 votes
2 answers
101 views

Best format for audio track with a single/few images

What would be the best (e.g. most compact) format for a "video" that is actually an audio track with a single static image the whole time? (example) And if it was not one static image, but a slow ...
Baruch's user avatar
  • 143
4 votes
1 answer
910 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. ...
user11613's user avatar
3 votes
1 answer
2k views

Background color of MP4 rendering incorrectly in QuickTime

I am converting a .MOV file into .MP4, .OGV and .WEBM for web use. I have found that the background rendered by QuickTime and Safari is not white although the same MP4 has a white background when ...
Tom's user avatar
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3 votes
3 answers
5k 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'...
user3643's user avatar
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3 votes
2 answers
1k views

Optimizing MPEG2 Encoder in Adobe Media Encoder

We're looking at using MPEG2 as an alternative to ProRes 422 for delivery & archiving. There are many options in there which are beyond my knowledge; I would like to understand them and maybe get ...
d0g's user avatar
  • 304
2 votes
1 answer
726 views

Which measurements can I take using which programs to exploit the already low quality and save as much space as possible?

This is the best my actioncam can create. My goal is to take advantage of this low quality and save as much harddrive space as possible so visible quality remains. Which measurements can I take ...
Vitalis Hommel's user avatar
1 vote
1 answer
893 views

mov to mp4 conversion produces grainy results

I am using handbrake to compress 250mb of 3d animation stored in .mov. This is how the mov looks: The compressed version has some artifacts. Like it doesn't have enough shades of grey: How can I ...
sanjihan's user avatar
  • 151
0 votes
1 answer
2k 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 ...
EllipticalInitial's user avatar
-1 votes
2 answers
984 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-...
pmor's user avatar
  • 125