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Questions tagged [video]

The tag has no usage guidance.

0
votes
1answer
96 views

How to signal end of stream?

I am designing an interface for reading and writing video frames to various inputs and outputs. Stream operators seem to me a superb alternative to named functions for the task. This is the gist of it:...
1
vote
3answers
250 views

What algorithm is used in subtitles?

What algorithm does a video player use to find the subtitles to show at any given time? I'm building a video player that displays some notes on different times over a video. Each note has a starting ...
0
votes
2answers
189 views

How a standard video file is structured under the hood

I am new to looking into video file formats, and am wondering what it would take to parse one. To do that, I first would need to understand what the format looks like, so that's what this question is ...
1
vote
1answer
434 views

understanding video streaming on a servlet or webserver

This question has been asked quite a few times on StackOverflow and I would like to get an understanding of the concepts and process rather than directly solve a problem. I found the following post ...
3
votes
0answers
276 views

Perfect video processing pipeline?

I'm working on a modular video processing pipeline. It's currently presented as a tree of modules. Each module has a set of "results" and can dynamically request data results from other modules. Each ...
1
vote
1answer
466 views

Best approach to learn OpenCV to use with Swift? [closed]

I am trying to figure out how to use OpenCV with XCode's Swift. I need to do realtime video processing for the project I am working on, but I can't seem to find any good references on learning OpenCV ...
1
vote
2answers
1k views

Video streaming through Ajax calls

These days I have seen couple of sites (including Youtube) that stream videos through Ajax calls (XHR) in few MBs or even less than MB. For an example of what I said see the highlighted lines in the ...
-5
votes
3answers
2k views

What handles the work of video streaming in ASP.NET MVC?

I want to play video using ASP.NET MVC. In my understanding, the model deals with the video files stored in file system and data in database. The controller retrieves the path of video file from model ...
1
vote
0answers
129 views

Distributed Design to Speed Up Video Processing

Currently I have one web server running Django, which takes a series of images from a user, uploads them to an Amazon S3 bucket, and finally calls an Amazon Lambda instance, which runs a python script ...
1
vote
0answers
48 views

Xcode rolling video architecture

I am going to writing an App that records video but to save on memory space I want to allow the user to continually record and then, when something happens, they can save that period of time (post the ...
16
votes
1answer
2k views

Is progressive HTTP download a viable alternative to HLS/DASH/RTMP for providing live video?

I'm working on a website that needs to stream live video to users, and as such I've had to get my head around the sorry state of current browser-based video-streaming technology. The most popular ...
1
vote
0answers
128 views

block size and search window in Block matching technique for motion estimation

While reading different techniques for motion estimation, I came across the following line: "Usually the macro-block is taken to be of size 16 pixels and the search parameter is set to 7 pixels" in ...
0
votes
1answer
928 views

Difference between overhead of B frame and P frame

I understand that B frames either find the motion vector of the best matching block from either the past or the future reference frame. And P frames finds the motion vector of the best matching block ...
0
votes
2answers
1k views

Custom Video Player

I have a custom file type .mft which is basically a zip that has video inside (mpg,mp4,etc) that is encrypted/protected. My ideia is to create a custom video player which will read those .mft files, ...
3
votes
1answer
109 views

Are there any (free) video formats that include channels for arbitrary time-dependant data? [closed]

I'm in the process of writing an image analysis pipeline and I've hit a bit of a roadblock. Here's the 30,000-ft view: Images arrive as base64-encoded PNG images over standard input Images are ...
1
vote
1answer
1k views

ffmpeg: cut multiple input files with seeking to one output file [closed]

I have list of video files (loaded from database), each with start and end time of requested interval: # file begin end v1.mp4 1:01 2:01 v2.mp4 3:02 3:32 v3.mp4 2:03 5:23 And ...
5
votes
5answers
9k views

If we only know that a video is 720P, 480P or 240P can that unambiguously tell us of the resolution?

The main issue I have here is are the 720P, 480P, 240P... classes for defining video quality or do they unambiguously define the resolution of the video? For example, the wikipedia article about 240P ...
1
vote
2answers
112 views

Can I use the code for responsive video on this github link under a license?

This is the link: https://gist.github.com/jgarber/2302238 I am new to github and web development.So please bear with my questions. I would like to use the responsive video code on the link mentioned ...
-1
votes
2answers
191 views

Is it possible to build software that interprets video in real time? [closed]

Say you had a live video stream of a popular boardwalk that had thousands of pedestrians walk down it each day. Could software be written to count the number of people that walk by a camera and ...
0
votes
2answers
619 views

Average video frame size for video codec

In simple words, is it true that an average size of an encoded video frame would be FrameSize = BitRate/FrameRate? Because BitRate shows how much data we are transferring per time unit, and FrameRate ...
1
vote
0answers
481 views

Video streaming, with minimum delay

My goal is to stream a video from my pc, to a smartphone. However, i want the latency between us to be minimal. VIDEO -> ENCODING -> TRANSFER -> DECODING -> VIDEO I already know that the transfer ...
2
votes
2answers
420 views

Taking an audio file, automatically transcribing it, taking the output, and matching it to a transcript

We have transcripts of around 8000 videos. However, these transcripts do not have any timed text (ie: they are not time coded to the video) We are trying to ascertain whether software exists, or ...
7
votes
2answers
16k views

Does FFMpeg support gpu acceleration of media encoding/decoding?

I was wondering if ffmpeg supported gpu acceleration. I was reading on their websites and came across contradicting information. http://www.ffmpeg.org/general.html#Video-Codecs -H.264 / AVC / MPEG-4 ...
8
votes
1answer
6k views

What are MPEG I, P and B frames?

I was recently going over MPEG articles and videos to understand how it works. I understand what I, P and B frames do but I do not understand how the prediction is calculated. Assume that I want to ...
3
votes
5answers
2k views

What are the benefits and drawback of documentation vs tutorials vs video tutorials [closed]

Which types of learning resources do you find the most helpful, for which kinds of learning and/or perhaps at specific times? Some examples of types of learning you could consider: When starting to ...
0
votes
1answer
443 views

What are some feasible ideas for building a smart-device/console development portfolio? [closed]

I would like to start getting more contracts in the mobile, smart-device, and console development space and, having little prior work experience in the field, I need to build a portfolio of example ...
1
vote
1answer
158 views

Is it possible to modify a video codec + distribute it?

this is my first question on this particular stackexchange node, not sure if it's the most appropriate place for this question (if not, guidance to the appropriate node would be appreciated). the ...
7
votes
1answer
796 views

Help me understand how to stream video

I'm an experienced PHP web developer that is looking to understand the options available for streaming video. What I have: a video processing system (this one) that can provide output to various ...
24
votes
4answers
6k views

The perfect crossfade

I find it hard to describe this problem in words, which is why I made a video (45 seconds) to illustrate it. Here's a preview of the questions, please have a look at it on Vimeo: http://vimeo.com/...
4
votes
3answers
7k views

Advantage of using Swing over AWT [closed]

Why is Swing preferred over AWT? Which Swing component could be used for playing a video on it?
4
votes
2answers
7k views

How to make audio and video streaming servers work? [closed]

I am PHP MySQL developer and I am interested in the way television and radio are broadcasted over Internet live. I want to know how it works and and what are its requirements (which package of which ...