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Questions tagged [video]

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3 votes
1 answer
86 views

Why Is Inverse Quantization and Inverse Transform Taken Before Motion Estimation in H.264?

Here is the block diagram of the pipeline for the H.264 encoder (Fundamentals of Multimedia by Ze-Nian Li, Mark S. Drew and Jiangchuan Liu). The feedback loop is used for motion estimation, but why ...
Xosrov's user avatar
  • 131
1 vote
1 answer
206 views

How is a video file read frame by frame without loading the entire video file in memory?

As I understand that a video file is a binary file, the frames are not really present in a contiguous manner in a video file, so reading the video file by doing a seek and reading it frame by frame ...
Himanshuman's user avatar
2 votes
2 answers
1k views

Why does a software video encoder create higher quality output than a hardware video encoder

It is said commonly that a software video encoder has creates higher quality output than hardware encoder. Higher quality here means higher picture quality at a given bit rate. Hardware encoders are ...
jw_'s user avatar
  • 171
0 votes
1 answer
44 views

File size and screen recording

First and foremost, I would like an academic reference on how screen recording "works." I have tried searching online, but I only get results for the software itself. Exactly how does screen ...
AQuestion's user avatar
2 votes
2 answers
230 views

identify abrupt frame changes in a video

The frames of live streams or videos, in general, do not flow smoothly. A sports game would have multiple cameras recording the game and hence, there will be camera switches in the stream. I am ...
Yashas's user avatar
  • 275
1 vote
2 answers
279 views

How does RAMDAC get notified about framebuffer write?

I'm learning computer graphics, and I read this course lecture in order to understand how graphics I/O works under the hood. But the following explanation was not very clear to me: The values in ...
user6039980's user avatar
0 votes
1 answer
215 views

Sample K representative frames within a video

I have an image-based processing module that takes photos for some computer vision processing. I have many videos, but I need to sample representative frames as its inputs, preferably those frames ...
Tina J's user avatar
  • 131
-1 votes
1 answer
221 views

Scheduling Algorithm for Video Player

Background: In a nutshell. I coded a video player application (on linux). I used a proprietary library/API, with this, video and audio frames comes with well defined format. After decoding (via API), ...
the kamilz's user avatar
1 vote
1 answer
688 views

Algorithm for weighted elliptic curve fit

Background: I was trying to detect a face solely on the bases of features and the confidence of the features found. I am using a method to identify the features along with the response (confidence). ...
Akshay Rathod's user avatar
1 vote
1 answer
2k views

How to feed videos to a neural network

I have been coding and testing Neural Networks for a while but as of now I have only used IMAGE datasets. (i.e. I have M training images and N testing images). Some datasets are video datasets. The ...
user avatar
1 vote
0 answers
23 views

Convergent cameras stitching

I am currently working on a computer vision problem that involve 8 convergent cameras. I am trying to recreate a 2D image (I actually don't care of the shape of the image) that is the representation ...
Axel's user avatar
  • 11
0 votes
1 answer
371 views

Comparing 2 video files [closed]

I have a bunch of wmv files (~300), named the following way: video1.wmv -> videox.wmv. Some of these video files, are exact ...
Adam Baranyai's user avatar
1 vote
2 answers
870 views

How to label a video for supervised learning?

I have just started discovering the machine learning world! I found many tutorials showing how to deal with different types of data. I walked through some tensorFlow tutorials and I think they have ...
Sumo's user avatar
  • 11
0 votes
0 answers
59 views

Filter bubble algorithms for presenting related video lists

In a filter bubble, what are some of the techniques and best ways to determine the relationship between a video that is watched or liked, and the list of related videos to be presented to the browsing ...
Jack Maddington's user avatar
4 votes
1 answer
5k views

Why does a color video compress better than a black and white video?

It was asked in an exam why a color video compress better than a black and white (grayscale) video using MPEG but can't find anything explaining it. In other words, we would apparently get a better ...
Stéphane Bruckert's user avatar
10 votes
4 answers
2k views

How does a computer play a video while doing something else?

How is video playback done on a computer? It's obviously not relying purely on the CPU, since video playback continues when a user performs another activity, such as typing into a YouTube comment ...
Ellen Spertus's user avatar
0 votes
1 answer
84 views

Compression technique exploiting common similarities

I asked this on StackOverflow, but it was determined more appropriate to post here. So it goes like this.. For people concerned about users having slow connections and timeout issues, it is known ...
null elif's user avatar
1 vote
0 answers
1k views

Compare 2 video files (could be in different formats and quality) by content [closed]

I'm interested - is it possible to implement algorithm which could compare 2 video files and answer, are they the same with some level of precision. Is currently exist some methods which allow to ...
Ph0en1x's user avatar
  • 141
3 votes
0 answers
117 views

Lossless Video Compression Pipeline

The only paper I can find about an implementation of a lossless video codec is an article by Michael Niedermayer which explains the FF1V compression pipeline. I'm wondering if anyone else has found ...
ninjaneer's user avatar
  • 131
5 votes
1 answer
158 views

Why are blocking artifacts serious when there is fast motion in MPEG?

Why are blocking artifacts serious when there is fast motion in MPEG? Here is the guess I made: In MPEG, each block in an encoding frame is matched with a block in the reference frame. If the ...
Bear's user avatar
  • 153