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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1answer
650 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
20 views

Trim (remove frames from) live video from webcam

I have a webcam that captures video stream. After 30 seconds I want to remove 1 sec of the video from the start and keep capturing the video stream and so on. In short, I only want to save the latest ...
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1answer
29 views

If I screen-capture a snapshot from a HDR movie, will the snapshot image be a HDR image?

I have a HDR movie content playing on a HDR supported PC, using software like the VLC layer. If I take a snapshot to get a png image file, will the image file include the HDR information? That is, if ...
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2answers
6k 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
12 views

using canon 5D markiii or Olympus OMD EM5 as computer video camera?

I tried the EOS utility and cam link USBs but nothing works for the two cameras that I own---canon 5D mark iii or Olympus OMD EM5. I understand that they are pretty old models. I was wondering if ...
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1answer
33 views

Camtasia Studio video files are too big

I've been trying to export an HD video from a screen recording created with Camtasia studio, but every rendering is returning videos with 80 mb/s of bitrate, I'm setting it to 65% quality, MP4. If I ...
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2answers
372 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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1answer
326 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
150 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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1answer
236 views

Can't capture video from dshow device. FFmpeg finish immediately resulting empty file

I'm digitizing my old tape recordings from usb dongle. Everything been ok, I digitized several tapes, but I'm abandoned this project for a while and reinstalled windows. Keeping on secondary drive the ...
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0answers
19 views

How many I-frames are in a single shot?

I have some fundamental questions on shots and I-frames. When we apply shot detection on a video, how many I-frames will exist in a shot? How many frames exist between two I-frames? And does the shot ...
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1answer
170 views

How to up scale video resolution for Video Card

I've a Black Magic Declink Mini Recorder Frame Grabber which supports minimum 720p as Video Input. But my camera has a VGA resolution which ostensibly will give output in 640*480 resolution. The card ...
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1answer
802 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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1answer
19 views

How to make scenes look continuous?

So I shoot scenes with my cellphone (whether FHD or UHD). But other scenes I take them from clips I find online in a subscription service. If I try to make the video of contiguous scenes combining ...
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2answers
21 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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2answers
23 views

Record for an hour using mobile phone

I want to record someone speaking for about an hour without any gaps. To do this i'm using a Samsung Galaxy s8. The default video application splits the video into 4gb files when recording longer ...
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1answer
414 views

FFmpeg Can't Capture Window Rendered with Secondary GPU

Edit: I am using the terms "primary" & "secondary" cards below loosely. I'm just assuming the Intel card is considered the first card. I recently discovered how to use my secondary graphics card (...
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1answer
17 views

Is video output in YUY2 color space lossless if the input is sRGB?

I am considering purchasing one of these: https://static.cloner-alliance.com/manual/ca-1080fl_user_manual_v1.1.pdf It claims to be able to capture "uncompressed video", but in the list of ...
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3answers
48 views

Syncing Audio and Video

I have am doing a video recording podcast. I am recording the audio with Audacity with my 4 Shure mics hooked up into my Clarett 4pre USB. I am recording the video with OBS Studio a Cannon Vixia GF ...
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0answers
10 views

Variable audio drift from screen captured VR project in Unity

I'm new to video editing, and I need to sync up the audio and video from two different sources for a Virtual Reality game. Basically, I have the VR itself running in Unity on one computer, with the ...
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1answer
39 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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2answers
32 views

Permanent metadata for videos

Is there any existing container (video format) in which the metadata is immutable? I am new to this topic and my use case is that once a video is recorded, I want to preserve the metadata (for ex ...
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0answers
18 views

Poor Capture Quality with Camtasia

I build video tutorials. I need to capture video in raw high-quality format so I can hand it to the editor. But, when I record video in Camtasia 2019 or 2020 (new version), the editor complains that ...
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1answer
32 views

Why does my VCR output a grayscale video if I use an S-Video cable?

I asked here if an S-Video cable could improve the output quality of my VCR (Sharp VC-M401SM). The answers were promising so I bought this S-Video cable (they send me a 2 m cable instead of 0.5 m). ...
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0answers
25 views

Benefits of component/RGB connector (vs. S-video or composite) for VHS capture?

I know it's 2020 but I still have a few VHS tapes to digitise. I do not expect the picture quality to be necessarily good enough to worry about this question. Still, I would hate to lose any tiny ...
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1answer
25 views

USB Webcam not working with USB Microphone

I have two USB devices: a webcam and a microphone. I can play the webcam's video into VLC and GUVCView. However, I want to use the microphone for another application. The issue is that launching ...
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1answer
53 views

Best practice for recording video calls

I’m a video producer isolated because of Covid19. I’m going to be spending a tonne of time recording guests over video calls. So far I’ve been asking them to record audio locally, recording the ...
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0answers
12 views

Application specific screen recorder for Android

For windows, using OBS studio, I can record the screen of a particular application. If in between, I open another window, the recorder records only the selected window and not the window on top. But ...
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0answers
13 views

FUJIFILM X-T4 live stream capabilites

I'm trying to find out how useful FUJIFILM X-T4 will be as a streaming device. According to the specs it is able to record decent DCI4K 60 fps 10bits. It is also capable of emitting it properly via ...
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0answers
10 views

Recording WebCam + live viewing what I am recording not possible: system requirements?

I want to record a video using my WebCam + live viewing the video I am recording to check if everything looks as I want it to look. When using VLC, e.g. with the "stream" option and turning on "...
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1answer
38 views

Best camera for turnkey studio recordings

I work for a university, and I will be working on setting up a small recording studio for our department. The purpose of the recording studio will be to record high-quality educational content. We ...
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1answer
24 views

How to get a TV channel to stream as IP camera

My apartment building is broadcasting security cameras via a TV channel. I want to watch this broadcast on an IP camera viewer software (and there combine it with IP cameras that I am using). Is that ...
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1answer
33 views

Can I capture different native resolutions with the same CCD-Sensor?

Im working on a paper for my university and need capturings of the same scene in different native resolutions. Im currently using the Logitech BRIO camera with OBS for capturing. My question is: If ...
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1answer
30 views

How to record myself while not noticing myself?

I am using an Android Oreo phone. I would like to make a video of myself, but while I make it, I want the screen to go blank. This is so that looking at myself on the phone while I record will not ...
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0answers
386 views

FFmpeg 2017 vs 2019 decoding performance improvement

I was trying to do some basic profiling on ffmpeg, following my previous question here. I have a relatively high-bitrate .ts file (17mbps), and I have two versions of ffmpeg (2017.3 and 2019.4), and ...
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1answer
328 views

DeckLink recording using ffmpeg on Ubuntu 18.04 doesn't start

I've been spending the 24 hours troubleshooting this problem, but am getting a bit stuck. Pre-info: I'm running an Ubuntu 18.04 server with a DeckLink Duo 2 card inside. Goal: Capture video from the ...
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1answer
113 views

Compile FFmpeg example code

I was trying to compile an FFmpeg example code HERE that illustrates how to use filters using it's C APIs. I compiled the code (throuh a universal make). As the usage suggests, I'm doing this: ./...
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1answer
16 views

Software that captures and compresses simultaneously

I'm trying to find open-source software that compresses video captured from a webcam automatically. I'm thinking of automatically compressing like in post-production. For example, compressing the file ...
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1answer
568 views

Call FFmpeg filter from source code (C API)

I'm trying to find out how to call a FFmpeg filter (freezedetect) from within FFmpeg's source code. I see the filter's file is under libavfilter/vf_freezedetect.c, but I don't know how to use that ...
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0answers
2k views

Extract the frame (in image format) at exactly every minute (or second) from a video (by ffmpeg)

Motivation: I would like to seek the frame, then take high quality and exact time screenshots (images) from a video. The video is length is 00:48:43.71 and 23.98 fps (we can think it is 24 fps, isn't ...
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3answers
204 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
138 views

Is a UK PAL video tape compatible with a continental Europe PAL VHS/S-VHS player in terms of video and sound

I've read that the difference between UK PAL and Continental PAL is the carrier frequency used for the audio. But is that referring to: the (now former) analogue TV broadcasts the encoding on the ...
3
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1answer
168 views

Why is my Linear FOV GoPro Hero 4 Black video distorted at edges?

I installed the latest firmware as of 09-APR-2019 to my GoPro Hero 4 Black. I recorded video in 1080 60fps in LINEAR FOV mode with ProTune enabled. Why am I seeing lens distortion at the edges? For ...
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0answers
533 views

Desktop Capture Has Become Choppy/Jerky with FFmpeg

Recently, videos produced by capturing a window on my system using FFmpeg have become choppy/jerky, as if frames have been dropped or duplicated. FFmpeg will sometimes report that a number of frames ...
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1answer
30 views

What is the good video equveilent of 1300D?

I was surfing the net and I found this answer. Bottom line with the canon rebel series cameras is that the video is pulled from a low resolution capture of the chip which is normally used for ...
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1answer
33 views

How do you make video look natural?

I want the videos that I will shoot to feel natural and I don't know what I have to do. The research I did in the internet says aperture of our eyes are around F/8 in bright conditions and around F/2 ...
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1answer
57 views

Retrieve and decode V-Chip data from an aired digital TV stream

I'm trying to retrieve and decode V-chip data from my TV streams (NTSC/ATSC digital streams). Apparently these data are embedded somewhere in the stream itself, but I have no clue how they are ...
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1answer
491 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 ...
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0answers
16 views

Horizontal noise on RCA capture

I'm trying to record some Wii footage using a Silvercrest capture card. I've managed to get the drivers working and recorded a snippet via an RCA A/V cable. However, there's a weird kind of noise - ...
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1answer
55 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 ...