Questions tagged [video-capture]
the process of capturing a video signal with a computer, using a capture device (PCI-E, USB, Thunderbolt)
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24 views
Is there image degradation when you apply the same chroma subsampling iteratively?
I have digitalized a set of old family VHS tapes. As you know, VHS relied on chroma subsampling. And the capture device creates files with the 4:2:2 tag. Now, when I encode again with ffmpeg to get ...
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1answer
29 views
How to capture / digitise a live satellite stream
I have coordinates, descrambling codes, et al for a live satellite broadcast. I'm looking to capture that feed into a digital stream that I can feed into AWS's Video services.
My experience is ...
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1answer
18 views
How to split video output signal from 1 PC to 40 projectors?
I am thinking of implementing this by daisy-chaining multiple splitters but I am not sure if it will work.
Does anyone know of a cost-effective solution to this?
Thanks.
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0answers
9 views
How to make HD-SDI cable?
If i get rg6 75 ohm and terminate it with bnc clip and pug it to switcher and camera. We have use rg 6 for cable tv connecting and if those cables are terminated with BNC clip which are used in CCTV ...
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1answer
16 views
making mouse click action obvious in a screen-cast video-capture
One of the challenges, in creating a tutorial video via screen video capture, is that it becomes a challenge to make obvious which mouse action was used to produce a certain action on the screen.
The ...
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1answer
78 views
Lossless Capture with FFmpeg
I’ve been attempting to do lossless game capture as I’ve been working on a program to do frame rate analysis. I haven’t had much luck finding a program that does lossless capture as AmaRecTV, Dxtory, ...
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3answers
43 views
Recording 720p source with 1080p
I have started video recording some of my game sessions recently. Some of the consoles I am using output 720p and I was wondering what the effect would be, if I record them with 1080p:
How does that ...
2
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2answers
39 views
Frame capture from videos: I-frame vs P-frames
I'm trying to capture various frames within a x264-encoded video files into png files (in python), and then compare the quality of them:
cap = cv2.VideoCapture(filename);
//get frame_number for ...
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1answer
32 views
resend headers NUT formats
If I do this
ffmpeg -f dshow -video_size 720x480 -framerate 29.97 -i video="Roxio Video Capture USB":audio="Line (Roxio Video Capture USB)" -c:v mjpeg -c:a pcm_s16le -map 0:v -map 0:a -f fifo -...
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0answers
42 views
FFMPEG Speed drops and warnings
I've been trying to stream from a BlackMagic DeckLink Mini Recorder to 4 different outputs using FFMPEG, but i get a huge delay let say more than 60 seconds of delay, it takes a long time to buffer on ...
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0answers
119 views
Converting VHS tapes to digital using capture device and VLC player, image is jerky
I am trying to convert my old home videos to digital.
I bought a capture device and used EasyCAP which worked fine for the first three videos tapes. Then my computer installed an update and the ...
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0answers
38 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 ...
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0answers
16 views
Video recording framerate limitation causes? (e.g. 1080p at only 60fps despite same camera records in 2160p?)
I know, smartphone cameras are maybe not the primary interest of professional videographers, but I am interested into the technical aspects.
They can also be relevant for real cameras.
There are ...
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2answers
40 views
Is failure free streaming possible in todays world?
Is streaming video from one PC to a physical second PC with recording it there, without getting any frame drops, artefacts, basicly everything what the source video don't have, in todays world doable ...
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0answers
30 views
HDMI Splitter Shutting off Output Channel
Hey so what I'm trying to do is take HDMI input (from a computer) to a splitter from which one channel goes to some viewing device (projector or something) while the other channel goes through a ...
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0answers
33 views
How do I connect a Grundig SVR 4004 video recorder to a converter to digitise SVC tapes?
I'm looking to digitise some old SVC tapes on a Grundig SVR 4004 video recorder. Here is the Wikipedia entry.
I understand I should use a cheap USB converter such as this one but haven't been able to ...
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1answer
37 views
Highest quality way to extract a still from video
I have a MP4 that I really really want a still from.
I want to make a canvas from that still.
I have access to: Adobe premiere elements 12, ffmpeg and gimp.
I want the still to be the highest ...
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1answer
162 views
What output video format for Kazam requires less cpu power?
Please tell me what is the appropriate StackExchange site to post this question if it doesn't fit here.
I use Kazam to capture my videoconferences. It gets too CPU-demanding but the program is ...
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3answers
69 views
Looking for the fastest way shoot video on a camera and review it on a laptop
Our freestyle ski team is looking to invest in a system that allows athletes to immediately review their competition ski runs with their coach after they get to the bottom. While they're playing back ...
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0answers
325 views
What timing settings in VirtualDub should be used for VHS capture via EasyCap?
I want to digitize my VHS (PAL) home video tapes using an old video cassette player and EasyCap. Here is the photo of my EasyCap chips for reference:
After several days of reading how to perform ...
1
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0answers
76 views
Is the Flycam Galaxy Arm and Vest compatible with a Steadicam Solo?
I am planning on getting myself a Steadicam Solo Stabilizer and Monopod from B&H Photo Video. However, for my purposes I would really need an arm and vest kit that I could mount it onto. While I ...
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2answers
116 views
Mounted Canon VIXIA HF G20 -
Church installation. We have the camcorder mounted 12' above the floor and I have to use a ladder to get to the camera to take out the SD card and then replace it after I have downloaded the video for ...
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2answers
30 views
What should I do to improve the quality of the screen capture?
I'm creating videos to post to YouTube.
My videos are about some jobs I do on the computer.
I watched some of my videos posted and that the quality of the video capture was not very good and clear.
...
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1answer
154 views
AVI Capture in VirtualDub: MP3 Compression
I would like to capture my old VHS tapes to my HDD. I already was successful installing the xvid codec which gives me an acceptable video compression.
But somehow I am not able to set audio ...
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1answer
22 views
PCIe video capture card
Is it better to go with a video capture card with h.264 encoding or just a raw input port? I have powerful pc but not sure best card to use for high quality image, reliability, and ease of install.
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1answer
38 views
Is there any free video screen capture applications?
I am trying to find a totally free screen capture application for Windows and MacOS. Is there any free apps that don't put watermark on the video ?
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1answer
22 views
Need advice about VCR to PC connection
I need advice for something I want to do with VCR to PC image transfering. I have bought a video capture usb (RCA to usb) but there is a problem with the image... It's shaking right and left.
Like ...
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0answers
71 views
Which stabilizer for my GH5
Since a week, i search a stabilizer for my panasonic GH5. I have read some articles which speak about difference between gimbal and steadycam. I want to capture my hike, landscape, and somes other ...
1
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1answer
452 views
ffplay - Live capture video gradually lags behind
I have a Magewell capture device that I'm trying to preview with ffplay. It works great, except over time the video will become choppy and lag behind the actual live feed. Right clicking on the ...
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1answer
353 views
capture card for thunderbolt 3.0
I'm a youtube gamer and I'm interested in making the transition from pc to mac. Unfortunately, I'm not too familiar with macs and any challenges their usb thunderbolts will pose. I want to get the ...
2
votes
1answer
1k views
How to add a time stamp using ffmpeg to a screenshot capture of a video
I am trying to output a screenshot of a video at an specified time and the resulting picture should have a black square with the time that was given initially.
So far I was only able to produce a ...
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1answer
382 views
ffmpeg: Why did my capture speed drop? (can no longer capture using same command)
I've been using the following command to capture video with ffmpeg for the past two months using my Blackmagic Intensity Pro 4K capture card:
ffmpeg -bm_v210 1 -rtbufsize 1500M -threads 4 -f decklink ...
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0answers
31 views
Capturing videos of specific length using Canon EOS in LiveMode
I would like to capture videos of a specific length on my computer, using the Canon EOS 750D.
More precisely I want to put it on a tripod for one week and it should take videos of a chosen length and ...
2
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2answers
523 views
Video capture software for 10-bit 4K
I have a Blackmagic Intensity Pro 4K video capture card and Panasonic GH4, which can output 10-bit 4K from the HDMI port.
I'm running Windows 10 and I have two 1 TB SSDs, but with write speeds of ...
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1answer
747 views
Cheap option for recording HDMI output
I have been looking for a way for my PC to record HDMI output so I can record my gaming console without buying an expensive capture card. I already have a HDMI splitter I'm just looking for some cheap ...
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0answers
14 views
How do I import minidv video to windows?
I've connected my camcorder to the pc via firewall,driver was also installed but when I plug in and out nothing happen. (Except the sound). Do i need any software?
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1answer
23 views
which camera glasses allow recording while connected to power source
I am trying to use camera glasses for documenting benchwork.
Most of available models allow 1 to max 2h hours of recording for as long as the battery lasts and only allow next recording after the ...
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2answers
116 views
Why you need hardware (e.g. capture card) for video input?
To fully understand the how it works: you pick any device with HDMI output (let's say GoPro to reduce the variations) and you'll need a capture card for retreaving the data as multimedia signal. ...
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2answers
1k views
How to create screen capture video without losing it's quality?
I want to create screen capture tutorials such as https://laracasts.com/series/php7-up-and-running/episodes/1 (with the HD option) for YouTube. On laracasts' videos, words are excellently readable, ...
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1answer
4k views
FFmpeg : How to replace video background color with transparency? (while capturing)
I want to capture a window and overlay it on another video.
This is my command:
ffmpeg -i MainVideo.avi
-f gdigrab -framerate 25 -video_size 300x200 -i title="MyWindow"
-filter_complex "[0]setpts=...
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1answer
21 views
Request for Camcorder and Tripod Recommendations for Occasional Amatuer Usage, With Emphasis on Good Sound Quality
The title just about tells all about my question, but for a few more specifics, I want to record some monologue rehearsals (of myself) in an empty hall, and will later probably have some live ...
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2answers
41 views
DSLR vs CamCorders for video tutorials?
I'm planning to record video tutorials for a project of mine without compromising on the quality and I would like to know the best option to shoot them
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0answers
548 views
H264 capture from Mini Recorder
I've got a Blackmagic Design Ultrastudio Mini Recorder, which allows me to record HDMI and SDI in. In the list of supported codecs for capturing from it (both in premiere and its own software), I see ...
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2answers
4k views
How can I record adobe flash player stream
I am learning english and I want record this stream.
It's using flash player and in addition include PDF doc.
thanks for your interest
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1answer
566 views
Capture a wpf window : The flickering issue
I made a simple animation (as crawl text) using C#-WPF.
The animation is smooth and excellent. (in wpf window)
But when I capture it by FFmpeg as video it has flickering problem.
Please see sample1 ...
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3answers
876 views
What Options Are There for Importing Mini DV and Hi-8 Tapes to Thunderbolt?
So, it looks like FireWire is dead, and, along with it, all those FireWire ports on Mini DV cams and A/D converters from the 2000's. So what options exist today for getting Mini DV and Hi-8 tape ...
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1answer
1k views
ffmpeg buffered recording
need some advice to solve the problem
ffmpeg is receiving the nonstop live stream (rtmp source) from camera monitoring entry gates
after trigger is fired (gate/door is open) I need to create the ...
1
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1answer
34 views
Focus in Video vs Focus in Image
This is kind of a weird question, but how does focus in video work? I understand how focus works for single, still images. And, I understand that a video is a sequence of images. However, unlike ...
4
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1answer
3k views
How should I encode my 4K video stream?
I'm capturing uncompressed 4K video from my Sony A7R II via a video capture device, and am using ffmpeg to save the video.
My problem is I don't know what codec to use. The two options I tried are:
...
1
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2answers
5k views
Using ffmpeg to stream to or from Blackmagic Decklink Card
I want to use blackmagic cards with ffmpeg to stream their input but there is a problem.
When I use "H264 Pro" Encoder as a "decklink" or "dshow" input, I see this error in command line output of ...
