Questions tagged [compression]

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

Filter by
Sorted by
Tagged with
10
votes
3answers
116k views

How to Create a High Quality, Small File Size .mp4 from .mov

Recently, I helped a friend produce a short zombie comedy. He has now asked me to add it to the film's website as a digital download. I'm not having issues with the digital download. My issue is how ...
8
votes
3answers
8k 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, ...
7
votes
4answers
180 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 ...
6
votes
2answers
12k 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 ...
6
votes
1answer
3k views

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 ...
6
votes
2answers
2k views

Converting video with different resolutions slightly affects in file size, why?

I'm converting a video with resolution 960x720p using HandBrake on Mac. When I convert two videos with exactly the same settings but with different resolutions, the file size is almost the same. ...
6
votes
2answers
18k 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 ...
6
votes
1answer
3k views

ALL-I vs IPB. Which one to use

I'm fairly new do filmmaking. I've been trying to figure out which is best, but people seem to have very different opinions and everyone has his own arguments. My guess is that ALL-I should be better ...
6
votes
2answers
711 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 ...
5
votes
2answers
8k views

Can H264 achieve “equivalence” with ProRes 422?

Has anyone done or seen any tests comparing Apple ProRes 422 with high-bitrate H.264? We use 422 as a delivery format to go to DCP for theatrical versions of trailers. The bitrate is around 150mbps. ...
5
votes
1answer
161 views

Add noise to video while maintaining compressibility

I'm creating a promotion video that has to be uploaded to YouTube and Vimeo. In post-production (using Final Cut), I've added a noise for aesthetic purposes. This noise looks really bad on YouTube ...
5
votes
2answers
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 ...
5
votes
1answer
888 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)....
4
votes
3answers
309 views

Adding voiceover without video recompression

I have some mp4 video files with pretty poor video quality. I need to add a voiceover translation. I have seen some video software programs that could do the job but unfortunately most of these ...
4
votes
1answer
54 views

Video compression- how to prioritize one area over another?

I'm not sure if what I'm asking is possible, but here's the situation. I have a video I have made for distribution on the Internet (YouTube, Vimeo, etc.) The video clip is a composite of the ...
4
votes
1answer
1k 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 (...
4
votes
2answers
531 views

Recording of Lectures: Tips for compressing video with mostly still images

I have several recordings of lectures, some with powerpoint slides, some with writing on a blackboard. They are several GBytes each. However most of the time the video is a still image (besides maybe ...
4
votes
3answers
130 views

Trading off resolution vs quality

I have some 720p 30FPS H.264 video that I want to downsample for online backup. I want to get to somewhere around 10% to 20% of the existing size, which will evidently require a large sacrifice in ...
4
votes
1answer
445 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. ...
4
votes
1answer
4k views

How to specify CRF quality settings for different encoding software

Is there a way of specifying a quality setting for h.264 that is not software dependant? I'm trying to help a colleague create a specification for outside contractors when they deliver video to us ...
4
votes
1answer
608 views

Are JPEG compression and H.264 intraframe compression the same process?

I was looking at how JPEG compression works, and to me it seems to be really similar to what H.264 (and other video codecs) does with its intraframe prediction step. In both algorithms the image ...
4
votes
3answers
968 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 ...
4
votes
1answer
977 views

How to reduce the size of video to 700 mb

Please help me , I have copied some movies to laptop from dvd disk, but the size of movies are more than 2 gb. But the movies uploaded to torrents are only 700 mb with the same clarity. How to reduce ...
4
votes
2answers
7k views

Awful Audio in Video post-render (Premiere Pro CC)

I'm trying out Adobe Premiere Pro CC 2014 and I have a video with three audio tracks. The quality of each track is as follows (listed as the "Source Audio Format" in Premiere): 48,000 Hz 16-bit Mono ...
4
votes
1answer
744 views

Compressor 4.1: Why can't I select the group I made for distributed processing?

I'm currently trying to get distributed processing to work using two different computers on the same network running the same versions of osx, fcpx, and compressor. When I go to choose the group I ...
4
votes
2answers
82 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 ...
3
votes
3answers
16k views

What benefit would I get from using Apple Compressor instead of just exporting from Final Cut Pro X?

I have Final Cut Pro X 10.1.4. I usually always use the "share" option to export my video and select whatever format I want to share with. Usually either "Master File" or "YouTube". I also see the ...
3
votes
2answers
657 views

1080p60 recording has very strong compression artifacts, default Neat Video not reducing them much

In attempting to record in the highest quality on a JVC GC-PX100 camcorder, I've been recording 1080p video. Unfortunately, viewing the video upon edit shows very strong compression artifacts, which ...
3
votes
1answer
59 views

Bluray I/O speed

I don't know if this is the correct place to ask this type of question, but here is it. I wanted to find a ball park size of each blu-ray frame size in bytes. This is my calculation which cannot be ...
3
votes
1answer
4k views

Burn a single HD video into a DVD without losing quality

I created a video (slideshow of 14.2MP photos and music) using Windows Live Movie Maker. The video's resolution is 1440x1080 and is as WMV with 840MB. Now what I want is to burn that HD video (no ...
3
votes
1answer
218 views

Converting WMV to MP4

I just joined this community and hope my question is acceptable since it is quite "noob" like. I have a .wmv video file that is 1280x720 and causes windows media player to abort after excessive ...
3
votes
2answers
634 views

Why does variable bitrate still have a bitrate specified?

My understanding is that the vorbis algorithm uses a variable rate of encoding. So, when encoding videos with audio in vorbis format, why does Handbrake ask me for a bitrate? What does Handbrake do ...
3
votes
1answer
45 views

Prediction and Motion Estimation

As far as I understand, the motion estimation is a process, where when we have two frames t and t+1 we search for the blocks/pixels that changed position and then encode that change with a motion ...
3
votes
4answers
1k views

Compressing of DSLR video

I m recording full HD video in 1080p /30p format with my Nikon D5200 but i find the size of video is to high i.e. 10 GB for an hour. Now i want to compress it to lesser size in the range of 1-2 GB ...
3
votes
1answer
137 views

Bulk cutting and compression

I am looking for a piece(s) of software that can cut bulk videos into pieces and compress them. So say I have 10 videos each 20 min, I would like to make a setting 5 min and the output would be 1 ...
3
votes
1answer
513 views

Reasons for using DNxHD instead of ProRes?

I often use ProRes or DNxHD codec without any thoughts, because the quality is very similar, even though the code and the compression algorithm certainly is very different. I would like to know in ...
3
votes
3answers
142 views

Looking for a suitable lossy video codec to quickly record video in-game

I'm working on integrating a video recording functionality inside of a game, so that game footage can be automatically encoded to video and shared online from within the game. Currently I've ...
3
votes
2answers
878 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 ...
3
votes
1answer
131 views

Exam Question - end-to-end delay from video capture to video playout

Hi I'm preparing for my exam tomorrow and I've come across a 17 Mark question which seems trivially easy, so I think I'm missing a key point giving the rest of this exam is fairly difficult. The ...
3
votes
1answer
317 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 ...
2
votes
1answer
35k 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 ...
2
votes
2answers
503 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'...
2
votes
2answers
410 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 ...
2
votes
1answer
54 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 ...
2
votes
2answers
39 views

Last bit of RGB changed

I'm going to compress a video but I have one problem. Is a frame with a bit(last bit) of each color(RGB) changed unacceptable or distinguishable from the original one in HD?
2
votes
1answer
87 views

Archiving raw video

I am trying to organize the videos on my external harddrive. I have a lot of home video shot with a hand held camera, and now I am using a GoPro 4 camera that I record 4K video with. It consumes a lot ...
2
votes
2answers
2k views

What deinterlacing filter should I use to encode/compress a PAL MPEG-2 576i 25fps raw file?

I have a PAL MPEG-2 576i 25fps raw capture (presumably either straight from satellite or a DVD recorder) that I would like to encode to AVC. I'd like to deinterlace the file during compression with ...
2
votes
1answer
2k views

Convert 1920x1080 Video to 720x480 With Letterboxing

I'm trying to find the best application on windows to do this HD to SD conversion for a video server which requires files to be exactly 720x480/29.97fps MP4 H.264 to function. I can't find any options ...
2
votes
1answer
1k views

How do DVDs avoid the blockyness that plagues dark scenes in most video files?

When a DVD is ripped to a file on a computer the dark scenes typically get compressed to the point of illegibility; huge squares of black are all set to the same value, removing all the detail. This ...
2
votes
1answer
1k views

Playing back 1080p and 720p videos (same bitrate) on a 720p display

Suppose a high quality, uncompressed video is re-encoded twice, with almost identical encoding settings at a relatively low bitrate of 4mbps, but at different resolutions, first at 1080p, and then at ...