13 votes
Accepted

Using h264 in loseless mode brings small unexpected results

It's an artifact of the player, not the encoder. I used the command below to generate a RGB format capture in HuffYUV ffmpeg -f dshow -video_size 1920x1080 -framerate 30 -i video="screen-capture-...
user avatar
  • 30.2k
8 votes
Accepted

Do video formats support colour profiles?

No most video formats (nearly all) do not allow custom ICC color profiles to be embedded. (Improvemet/correction: MP4s can have color profiles tagged in the metadata of a video file.) most video on ...
user avatar
8 votes
Accepted

why movie video is different from other videos (sports, news, or other)

Movies have certain "looks" to arouse certain moods. The lightning and color depends on the intention of the movie and each individual scene. Let's take the picture you linked as an example: The ...
user avatar
  • 5,382
8 votes
Accepted

Does transcoding always mean quality loss?

Generally, H.264 and H.265 (as well as others like VP9) are lossy codecs, at least in their default settings with most encoders. This means that whenever you re-encode from one to another (or even in ...
user avatar
  • 955
8 votes
Accepted

Correct "stripes" in VHS record

Those are interlacing artifacts. They become visible when the motion in the video is faster than the field rate, so that when both fields are combined into a progressive scan image, the movement is ...
user avatar
7 votes
Accepted

How to Record a Dark scene without any Noise?

With low light levels your brightest signal will be close to the noise floor, so you only really have three options: a camera with better low light performance (although this can only take you so far)...
user avatar
  • 2,291
7 votes
Accepted

What CRF or settings I should choose for h265 in order to achieve a similiar quality of h264?

The CRF scales for x264 and x265 do not correspond. x265 CRF 28 is supposed to be equivalent to x264 CRF 23. But x265 is not yet as mature in its development as x264, so take that CRF equivalence with ...
user avatar
  • 30.2k
7 votes

8bit vs 10bit vs 12bit

I can answer your first question. At the same bitrate and transcoding from an 8-bit source 10-bit HEVC is better than 8-bit HEVC, because it hardcodes dither. archived version of https://gist.github....
user avatar
  • 79
6 votes
Accepted

Screen refresh rate above 100 Hz noticeable?

No, there is no practical limit that we know of yet to what would be best, there is however a practical limit to what we can capture and display. In tests with airforce pilots, subjects were able ...
user avatar
  • 19.2k
6 votes
Accepted

Smartphone vs camcorder

There are a few things you are missing, and a few more you just aren't fully appreciating how much of a difference the things you mentioned make. First, the S6 sensor is not over 1/2 inch, it is 1/2....
user avatar
  • 19.2k
5 votes

Compare an original video with a transferred video?

There are quite a few programs that do so-called "full reference" measurement, i.e. comparing an original against a degraded signal: http://www.acceptv.com/en/products_vqa.php http://compression.ru/...
user avatar
  • 955
5 votes

Quality of VHS converted to DVD

One big loss in converting VHS to DVD arises from going through the composite domain. Both VHS and MPEG2 use a separated chroma paradigm -- on the VHS tape are two signals, essentially luma and ...
user avatar
  • 4,654
5 votes
Accepted

Why does editing a video by Adobe Premiere Pro more than once decreases its quality?

There is a big difference between saving your project, then returning to the project to do some additional changes, such as brightness adjustments, then exporting a media file, and exporting a media ...
user avatar
5 votes

Please explain video bit rate further

Per the OP's request, I will attempt to explicitly answer his single-sentence questions. First I need you to define bit rate. Bit rate is the number of bits per second used to encode a video stream (...
user avatar
5 votes

8bit vs 10bit vs 12bit

In my experience (using handbrake) increasing the bit depth increases the file size but not by much. However, lowering the CRF is what causes significantly larger files. I encoded several times the ...
user avatar
5 votes

Why Camtasia always produce video with a low quality, even if I record in 1280p, for example?

The quality of the images you posted look completely normal to me for what you are doing. You're taking a screenshot and scaling it down. That means that anything drawn as a single pixel in the user ...
user avatar
  • 2,146
5 votes

4:3 video has 720x480 resolution

525/60 digitized SD video according to Rec. 601 is indeed 720 pixels wide, 480 pixels high, including some blanking on the sides. Digital equivalent of 625/50 is 720x576. In both cases, frame aspect ...
user avatar
5 votes
Accepted

4:3 video has 720x480 resolution

There are 2 different things: The real width and height of frames (in pixels) – see the green part of the following picture. The displayed width and height (during the playback) – see the blue part ...
user avatar
  • 1,362
4 votes

Bad video quality on 600D

Should be mentioned that the 600D isn't exactly the best DSLR for video out there. The artifacts that you are experiencing in your footage are the result of high compression. Check your video settings ...
user avatar
  • 7,099
4 votes

How to digitise old NTSC home videos for highest quality (with PAL player)?

As far as deinterlacing: With a good deinterlacer (QTGMC, or at least ffmpeg's yadif=3,mcdeint=2), you can get smooth video at 60000/1001 (NTSC) fps. If your source has quick motions that you'd like ...
user avatar
  • 2,618
4 votes
Accepted

How can I make professional video using an iPad?

Trade in the iPad and buy a desktop or laptop that you can edit on. You will not produce professional results entirely on an iPad. I am not aware of any good video editing options for iPad, ...
user avatar
  • 19.2k
4 votes

Screen refresh rate above 100 Hz noticeable?

The reason why modern TVs have been pushing higher framerates is not because people can see much beyond 30-60Hz, but because if the source framerate and the display framerate doesn't match exactly, ...
user avatar
4 votes

Avconv rotating mpeg4 - video loses quality

There's no way to do this losslessly, other than setting a meta-data flag and depending on players to rotate the video. (This is what cell-phone cameras do). With avconv / ffmpeg, what you're doing ...
user avatar
  • 2,618
4 votes
Accepted

Rendered two videos from Adobe Premiere with the same settings but different resolution and they're the same file size

Well you've kinda answered your own question: Both videos have the same size because you used the same settings, specifically the settings for target bitrate and maximum bitrate (assuming you're using ...
user avatar
  • 5,382
4 votes

8bit vs 10bit vs 12bit

I've been running some tests lately (2H2020) concerning reducing the size of some high quality movies of my collection, just for PC to TV 1080p viewing, from 20-30mbps videos to 2-3mbps ones. To that ...
user avatar
  • 41
4 votes
Accepted

Does repeatedly saving a video degrade its quality?

MP4 isn't an ideal format for intermediate saves. If you know you'll be re-opening the file, save it as losslessly as practicable, and use MP4 only for the final output. That said, depending on the ...
user avatar
  • 4,654
4 votes

How to change framerate with HandBrake without side effects

FFMPEG is probably a better tool for the job, if you are prepared to deal with the command line. Install ffmpeg from the packages found here. These are all ready-built and should have all the included ...
user avatar
  • 13.4k
4 votes

how to burn full hd movies (1080px720p) in DVD

DVD Video is limited to Standard Def, not High Def (HD). Blu-Ray overcomes that limitation. Alternatively you can use the DVD as a filesystem and play arbitrary media using a computer. But as a ...
user avatar
4 votes

What is causing these horizontal lines moving vertically up the whiter portions of the video?

You seem to have a flickering light source that is out of sync with the camera's rolling shutter. Traditional lights You should first verify that you are filming in 60/30/24 fps in regions whose power ...
user avatar
  • 773
4 votes

What are these rectangular patterns in the frame?

Those are compression artifacts, where the original video has been compressed and has lost data. Block-based coding for quantisation leads to artifacts like this, as the information depth in the image ...
user avatar
  • 2,291

Only top scored, non community-wiki answers of a minimum length are eligible