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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1answer
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 ...
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1answer
369 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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3answers
3k 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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3answers
35k 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 ...
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1answer
50 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 ...
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1answer
349 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 ...
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1answer
397 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 ...
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1answer
65 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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1answer
163 views

What is the difference between .mts and .mp4 video files?

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 ...
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1answer
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 ...
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2answers
918 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 ...
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1answer
113 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 ...
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0answers
16 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....
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1answer
1k 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)....
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115 views

How to achieve the best quality with the least file size for 1 hour long videos

I want to achieve a 1 hour long video from 5 second animation clip with 1920x1080p res, with best quality with an acceptable file size because currently my videos are 100gb + after I render the 1 hour ...
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1answer
262 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 ...
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1answer
172 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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1answer
66 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 ...
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2answers
75 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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0answers
35 views

Including Subtitles in FCPX via Compressor Preset

I am wondering if it is possible to burn-in subtitles (SRT, role) when rendering video via a Compressor preset that is set up as a destination in FCPX? I am not seeing such an option readily available....
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1answer
70 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 ...
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0answers
22 views

Modern video encoders/decoders keep producing compression artifacts: what is the (potential) reason?

Follow-up question for: Grime-like blocking compression artifacts on the decompressed video (H.264). Context: while watching videos from time to time I continue notice the presence of compression ...
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7 views

Deduplicating video codec

Say I have a 10 second video that I want to loop 1000 times (not just loop-play it in its presentation form, but have the actual video file be 10000 seconds long). This video will contain the same ...
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4answers
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 ...
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1answer
119 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 ...
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0answers
30 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?
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0answers
22 views

recording uncompressed or > 150000 kb/S video on a smartphone or tablet

Is it possible to record uncompressed or > 150000 kb/S video on a smartphone or tablet? If so, how and what devices are compatible? I am able to do this with cheap logitech webcams, however the ...
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0answers
22 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 ...
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0answers
28 views

Are there video motion tests (to point camera at) to assess encoder settings, rates, etc? (currently working in OBS)

I want to measure the appearance quality of motion against a variety of OBS settings in a talking heads video. What is a good way to test for motion in a video recording/capture running 15-60 minutes? ...
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2answers
2k 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
657 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
3k 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 ...
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0answers
542 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 ...
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1answer
12 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. ...
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0answers
14 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 ...
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3answers
2k 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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3answers
76 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) ...
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1answer
39 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 ...
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1answer
12 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 ...
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1answer
42 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 ...
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1answer
351 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 ...
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4answers
20k 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 ...
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1answer
258 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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1answer
29 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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1answer
42 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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2answers
148 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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0answers
820 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....
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0answers
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 ...
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2answers
4k 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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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 ...