12 votes
Accepted

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

Let me explain you from scratch. MOV, MP4, AVI, MKV etc all these are just containers, It is just kind of wrapper which contains audio, video, text, metadata file together as one file. It does not ...
Unstoppable's user avatar
9 votes

Is there any AI upscale tool for videos?

There's a few options I've seen listed at https://sites.google.com/view/aiupscalingtutorials/ai-upscaling: (in no particular order) 1. ESRGAN An open source AI upscaler (super sampler) based on a ...
Simon East's user avatar
8 votes
Accepted

What's the difference between "visually lossless" and real lossless and what does this mean for future encodes?

Technically lossless, or real lossless, means that when the output is decoded by a conformant decoder, the result is mathematically identical to the input. Visually lossless is a non-rigorous term ...
Gyan's user avatar
  • 32.6k
7 votes
Accepted

Techniques for compressing a slideshow presentation video?

x264 is the best-in-class encoder for generating H.264 video streams and you can use it via ffmpeg, a command-line tool, to encode to a small-sized file. Get a binary from here - opt for the latest ...
Gyan's user avatar
  • 32.6k
5 votes
Accepted

Loss of quality while adding subtitle via FFmpeg

As you are hardcoding subtitles, the video (with the subtitles added) will be re-encoded. You can use the CRF rate control method to modulate the quality of the output. So, start with ffmpeg -i ...
Gyan's user avatar
  • 32.6k
4 votes
Accepted

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

I don't agree that the other answer is a good idea in general, because "-vf yadif" will drop half the frames, thus resulting in a poor substitute of the original footage. Here is the thing: 576i25 ...
Mephisto's user avatar
  • 275
4 votes

Video compression- how to prioritize one area over another?

This is an interesting question, but I don't think that you will find a good solution without changing your inputs (the video elements you are using). I'm not aware of any software that allows you to ...
optic's user avatar
  • 71
4 votes
Accepted

Camera flash produces unwanted artifacts on the video

This is actually a collateral effect of the concept of rolling shutter. Most video devices do not expose all the frame area at once. They expose starting from one side and (up or down) and move from ...
Rafael's user avatar
  • 1,152
4 votes
Accepted

Producing small H.264 files with Adobe Media Encoder vs ffmpeg/libx264

Adobe licenses its H.264 encoder from Mainconcept, which doesn't do that well at low bitrates. x264 is pretty much the frontier when it comes at low size output for a given quality target, or quality ...
Gyan's user avatar
  • 32.6k
3 votes

Converting WMV to MP4

All that matters is if the MP4 looks good to you. Of course, you may be able to compress more. There is no set bitrate to use. More complex or rapidly changing visuals require greater bitrate. Most ...
Gyan's user avatar
  • 32.6k
3 votes
Accepted

How do you dramatically reduce the size of a video while keeping the quality as much as possible?

I'm not familiar with handbrake, but this is basically a math problem. First, you have to decide on a codec. One of the 'best' codecs in regards to quality/filesize-ratio as well as device-...
MoritzLost's user avatar
  • 5,412
3 votes

Compressing of DSLR video

Theoretically Current DSLRs use H.264 compression for their video. Optimizing an already compressed image without losing quality is something commonly done for GIF, PNG or JPEG still images, and while ...
Duvrai's user avatar
  • 803
3 votes

How does the h.264 encoder determine where to put i-frames?

This is a complex topic, with the exact algorithm unique to each encoder. Below is a pseudocode explanation from a x264 developer. B-frames aren't accounted for, but basic logic should be similar. ...
Gyan's user avatar
  • 32.6k
3 votes
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Convert 1920x1080 Video to 720x480 With Letterboxing

You can use ffmpeg, a free command-line tool, to do this: Without letterboxing, NTSC wide pixel-aspect ffmpeg -i input.mp4 -vf "scale=720x480,setdar=16/9" -r 30000/1001 -c:v libx264 -crf 20 -c:a aac ...
Gyan's user avatar
  • 32.6k
3 votes
Accepted

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

There are a few video quality metrics available for you to use, primarily SSIM and also PSNR. You can use ffmpeg to convert the video and then compare the output. Step 1 Convert the video ffmpeg -i ...
Gyan's user avatar
  • 32.6k
3 votes
Accepted

x265: Is it possible to re-compress HEVC video without quality loss?

In strict mathematical terms, no. In terms of maintaining an acceptable image quality, yes. If you use CRF 18 and a preset like ultrafast now, you should be able to get a smaller acceptable file with ...
Gyan's user avatar
  • 32.6k
3 votes

YouTube Compression: Why?

You should upload the highest quality your tubes can afford. The current YouTube help text on uploads is misleading. It states: Your videos will process faster if you encode into a streamable file ...
Elijah Lynn's user avatar
3 votes

Reduce render file size in After Effects

You need to change the encoding settings. By default, AE uses the AVI animation codec, which is very good at retaining quality but creates incredibly large files. Using an intermediary codec like ...
KC McLaughlin's user avatar
3 votes

Archiving raw video

The way you have worded the question makes it difficult to answer. I keep all mine in default format, because disk space is so cheap. I have a bunch of 2 terabyte drives to store it on. If you want ...
Dr Mayhem's user avatar
  • 2,317
3 votes

Reencoding H.264 to H.264 made it 40% larger

You are using a quality based variable bitrate compression factor on something that already has artifacts. That means it is going to attempt to preserve the video exactly as it is, artifacts included ...
AJ Henderson's user avatar
  • 19.3k
3 votes
Accepted

Does increasing the framerate while not changing the content affects compression quality?

This depends on the specific encoder, and the compression standard, by itself, may not have anything to say about it. x264, which encodes to H.264, takes frame duration, into account, in its ...
Gyan's user avatar
  • 32.6k
3 votes
Accepted

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

This is a complex topic, so best to link and excerpt From https://sonnati.wordpress.com/2010/10/19/h-264-for-image-compression/ H.264 contains a number of new features that allow it to compress ...
Gyan's user avatar
  • 32.6k
3 votes

ffmpeg clear video cache

Solved by clearing browser cache.
sirshakir's user avatar
3 votes

What's the difference between "visually lossless" and real lossless and what does this mean for future encodes?

In addition to "visually lossless", there's the concept of "visually almost lossless": "Visually almost lossless" is usually established by static side-by-side viewing. ...
Mingye Wang's user avatar
3 votes

Software that captures and compresses simultaneously

Most consumer video recording software I know compresses on capture. Mpeg and others can be configured for lower quality if you want greater compression, but unless you are recording a plain black ...
Dr Mayhem's user avatar
  • 2,317
3 votes
Accepted

Is video output in YUY2 color space lossless if the input is sRGB?

It's a bit of a semantics game. The YUY2 video mode is not "compressed," but it won't result in a bit-exact copy of RGB input. The luminance is full resolution in that mode, but the ...
wrosecrans's user avatar
3 votes
Accepted

Video artifact removal and restoration - How can it be done? (Really?)

If I understand you correctly, then most of the restoration goals will be impossible to be reached. While my knowledge of existing videos tools is not extensive, I am still pretty sure such a software ...
Matt's user avatar
  • 1,401
2 votes

How to reduce the size of video to 700 mb

Ok one thing to note is the resolution of the video. Most 700mb torrents are not full HD. most are 720p or if they are 1080p they are in h.265 Assuming resolution is 1080p you can go from 2 gb to ...
mediatech15's user avatar
2 votes

Trading off resolution vs quality

Decreasing the size a little won't help much, decreasing it a bit more induces a fair bit of aliasing (unless it smooths it also) butchering the quality without much gained. Cutting the size 50% will ...
Rob's user avatar
  • 847
2 votes
Accepted

Prediction and Motion Estimation

The prediction comes in when actually adding the motion estimation to both frames t and t+1. Consider a video of a ninja cutting a melon in half, but shot at a very short shutter speed, so as to ...
Michael Tiemann's user avatar

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