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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questions
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7 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
5 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 "...
3
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0answers
18 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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1answer
19 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
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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0answers
5 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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3answers
34 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 ...
0
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1answer
27 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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190 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 ...
2
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1answer
114 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
25 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
75 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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0answers
57 views
How to use record video with ffmpeg
can someone tell me how I can record a video + audio and can I specify the fps and the resolution of the output file ?
I'm very new to ffmpeg so i don't know much.
Thanks.
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1answer
58 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 ...
0
votes
1answer
325 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 ...
3
votes
1answer
113 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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1answer
164 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
369 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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0answers
235 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
29 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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votes
1answer
32 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
47 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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0answers
15 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
117 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
43 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
32 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.
0
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1answer
38 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
602 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
156 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 ...
3
votes
3answers
166 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
132 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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124 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
23 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
44 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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1answer
44 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 ...
0
votes
1answer
538 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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vote
3answers
77 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
693 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 ...
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0answers
121 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 ...
3
votes
2answers
284 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 ...
1
vote
2answers
33 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.
...
2
votes
1answer
293 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 ...
0
votes
1answer
26 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
75 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
81 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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1answer
1k 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
472 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
3k 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 ...
1
vote
1answer
605 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 ...
