Stack Overflow
Stack Overflow

Questions tagged [video-processing]

Video processing deals mostly with filtering video frames. Most common filters are noise removal, contrast and color modifications. For questions related to trimming and modifying videos use [video-editing], and [video-encoding] for questions related to editing videos into any format.

Video processing is a particular case of signal processing, which often employs video filters and where the input and output signals are video files or video streams. Video processing techniques are used in television sets, VCRs, DVDs, video codecs, video players, video scalers and other devices.

Most common filters are noise removal, contrast and color modifications. Relevant questions should include specific filters.

See also:

3028 questions
22
votes
7 answers

MOV to Mp4 video conversion iPhone programmatically

I am developing media server for Play station 3 in iPhone. I came to know that PS3 doesn't support .MOV file so I have to convert it into Mp4 or something other transcode which PS3 support. This is what I have done but it crashes if I set different…
Elegant Microweb
  • 476
  • 2
  • 4
  • 12
22
votes
2 answers

Extract list of specific frames using ffmpeg

I'm trying to use ffmpeg on a video to extract a list of specific frames, denoted by their frame numbers. So lets say I want to extract just one frame from 'test_video.mp4', frame number 150 to be exact. I can use the following command ffmpeg -i…
John Allard
  • 3,564
  • 5
  • 23
  • 42
22
votes
7 answers

Finding an interesting frame in a video

Does anyone know of an algorithm that I could use to find an "interesting" representative thumbnail for a video? I have say 30 bitmaps and I would like to choose the most representative one as the video thumbnail. The obvious first step would be…
Sam Saffron
  • 128,308
  • 78
  • 326
  • 506
21
votes
1 answer

FFmpeg - Overlay one video onto another video?

I understand that this is a very open ended question. I have done some initial reading into FFmpeg, but now require some guidance. Problem I have a video input.mov. I would like to overlay another video on top of overlay.wov. The result should be…
cdrev
  • 5,750
  • 4
  • 20
  • 27
19
votes
4 answers

How to create videos from images with php?

Let's say I have 10 images and I want to combine those images in a video like a slideshow. For example I want to show each image for 5 seconds and then continue with next image for another 5 seconds. If it's possible, it will be perfect to include…
mirza
  • 5,685
  • 10
  • 43
  • 73
19
votes
8 answers

FFMPEG: Extracting 20 images from a video of variable length

I've browsed the internet for this very intensively, but I didn't find what I needed, only variations of it which are not quite the thing I want to use. I've got several videos in different lengths and I want to extract 20 images out of every video…
Vapire
  • 4,568
  • 3
  • 24
  • 41
19
votes
3 answers

Convert video with ffmpeg using gpu

I have video sharing site and convert video with ffmpeg but it take a lot of time for converting. how can do it fast and safe? I think when ffmpeg match with GPU it helps me but I find no good reference to use. Which application or reference can…
sdnaghdi
  • 587
  • 2
  • 6
  • 19
18
votes
2 answers

Extracting DCT coefficients from encoded images and video

Is there a way to easily extract the DCT coefficients (and quantization parameters) from encoded images and video? Any decoder software must be using them to decode block-DCT encoded images and video. So I'm pretty sure the decoder knows what they…
mpenkov
  • 21,621
  • 10
  • 84
  • 126
18
votes
2 answers

how to reduce size of video before upload to server programmatically in android

I want to upload video to server, when I catch video from gallery or record from camera , the server response to me that error but when I upload video with size 2 MB , it is uploading successfully. How can I compress the video to reduce the size? I…
mostafa hashim
  • 360
  • 1
  • 5
  • 24
18
votes
2 answers

How can HTML5 video's byte-range requests (pseudo-streaming) work?

If you play an HTML5 video for a video that is hosted on a server that accepts range requests, then when you try to seek ahead to a non-buffered part of the video you'll notice from the network traffic that the browser makes a byte range-request.…
bhh1988
  • 1,262
  • 3
  • 15
  • 30
17
votes
3 answers

How can I solve "Unable to open 'raise.c' " Error?(VSCODE , LINUX)

( OS and Version: Ubuntu 18.4 , VS Code Version: Vscode 1.4 ,C/C++ Extension Version:0.26) Hello, I have read all the articles about "raise.c" and none of them solved my problem, I just wrote a simple OpenCV code which captures webcam's frames. each…
Hamid Reza
  • 492
  • 1
  • 4
  • 14
17
votes
6 answers

How to read a frame from YUV file in OpenCV?

How to read a frame from YUV file in OpenCV?
Jason
  • 379
  • 2
  • 3
  • 8
17
votes
3 answers

Android: Alternative to the deprecated Context.MODE_WORLD_READABLE?

From here I know a way to write a file and be accessible to other app and other intent, but now that the Context.MODE_WORLD_READABLE is deprecated how can I safely accomplish this? FileOutputStream out = myActivity.openFileOutput(fileTo,…
Marl
  • 1,492
  • 2
  • 22
  • 37
16
votes
1 answer

How to seek in FFmpeg C/C++

Does anyone know how to implement seeking by seconds (or milliseconds) in FFmpeg. I currently have a loop running through the frames of a video using av_read_frame() and I want to determine what time this frame should be at in seconds. If it gets to…
DRiFTy
  • 11,269
  • 11
  • 61
  • 77
16
votes
4 answers

How to play a video in a Seamless loop using media source extensions

I am working on media source extension to play the video in a seamless loop without any delay. I have done an extensive r&d about it and also done different things. Now i am working on this code
dev
  • 555
  • 1
  • 13
  • 31
1 2
3
…
99 100