5
votes
Accepted
Call FFmpeg filter from source code (C API)
You can't just call a filter, You must instantiate a filter graph.
First you need to create a buffer and buffersink via:
AVFilterContext* source = 0;
AVFilterContext* sink = 0;
AVFilterGraph *graph =...
- 1,100
4
votes
Accepted
Why is my Linear FOV GoPro Hero 4 Black video distorted at edges?
The distortion you are seeing has nothing to do with ProTune or other codec settings. Its perspective distortion caused by the wide focal length of the GoPro Lens + The low quality of the GoPro Lens ...
- 2,487
3
votes
Accepted
Frame capture from videos: I-frame vs P-frames
"I, B and P" don't refer to the viewed frames, they refer to the encoded, stored forms of the frames. However the frame is encoded in the file or stream, when it appears on the screen or is extracted ...
- 4,684
3
votes
Accepted
FFmpeg : How to replace video background color with transparency? (while capturing)
GDIgrab supplies a RGB feed so the colorkey filter can work here.
Try
ffmpeg -i 1.mp4 -f gdigrab -framerate 25 -video_size 300x200 -i title="MyWindow"
-filter_complex
"[1]split[m][a];
[a]format=...
- 33.6k
3
votes
How to add a time stamp using ffmpeg to a screenshot capture of a video
Use
ffmpeg -start_at_zero -copyts -ss 00:00:14.435 -i input.mp4
-vf "drawtext=fontfile=/path/to/Arial.ttf:
fontsize=45:fontcolor=yellow:box=1:boxcolor=black:x=(W-tw)/2:y=H-th-10:
...
- 33.6k
3
votes
Accepted
DSLR vs CamCorders for video tutorials?
DSLRs tend to have much larger image sensors than camcorders, which tends to mean much less depth of field (DOF) for a given field of view. Shallow DOF is great for isolating subjects from their ...
- 4,730
3
votes
Software that captures and compresses simultaneously
Most consumer video recording software I know compresses on capture. Mpeg and others can be configured for lower quality if you want greater compression, but unless you are recording a plain black ...
- 2,316
3
votes
Accepted
Is video output in YUY2 color space lossless if the input is sRGB?
It's a bit of a semantics game. The YUY2 video mode is not "compressed," but it won't result in a bit-exact copy of RGB input. The luminance is full resolution in that mode, but the ...
- 486
3
votes
Camcorder Tape Capture
DV can be captured off tape with a firewire interface. Firewire was a data transfer protocol created by Apple, Panasonic and Sony that enabled the transfer of digital Video and data.
Firewire plugs ...
- 13.8k
3
votes
Which gives better quality SCART or S-VIDEO?
I'm a US-based broadcast engineer who hasn't worked on analog systems in long time, so I haven't had any direct experience with SCART connections. That said, there shouldn't be any difference in ...
- 2,404
3
votes
Accepted
How can I record videos like this one?
This video is mostly a screen recording, with the mouse cursor recorded separately from the screen itself. Software like ScreenFlow can do this. The "zoom in and move" animations, along with ...
- 8,162
2
votes
Using h264 in loseless mode brings small unexpected results
Hellow. You need 4:4:4 pixel format and High444 profile in libx264 or h264_nvenc or other h264 encoder. And I guess that qp 0 is better then crf 0. For example:
-c:v h264_nvenc -qp 0 -pix_fmt yuv444p -...
- 21
2
votes
Is there any free video screen capture applications?
Open Broadcaster Software is a (good)
Free and open source software for video recording and live streaming.
Download and start streaming quickly and easily on Windows, Mac or
Linux.
- 33.6k
2
votes
Need advice about VCR to PC connection
The problem is almost definitely with the tape or the VCR. Most likely the sync or black level is off or the control track is fluttering, which is throwing off the ADC in the capture dongle. You will ...
- 2,404
2
votes
Accepted
ffplay - Live capture video gradually lags behind
So I solved this by simply adding an audio stream instead of having "none" selected. Doing this makes -framedrop (default) work properly. I left the master clock as default as well (audio) instead ...
- 81
2
votes
Accepted
Request for Camcorder and Tripod Recommendations for Occasional Amatuer Usage, With Emphasis on Good Sound Quality
90% of good sound quality is mic placement. The remaining 90% is the microphone. The 90% that remains of that is the preamp. Because mic placement is so important, you either have to accept putting ...
- 4,730
2
votes
What should I do to improve the quality of the screen capture?
Try to use OBS (Open Broadcast Software) for screen capture.
Screen Capture with OBS
It not best option, but it easy to use and it free.
Best solution:
Capture to lossless codec like huffyuv, edit ...
- 675
2
votes
What should I do to improve the quality of the screen capture?
Windows Media Encoder creates files in wmv format (I guess), which is highly compressed. Make sure you follow the YouTube recommendations
- 1,139
2
votes
Is failure free streaming possible in todays world?
Streaming video between internally networked systems has become the standard in the Video Production / Post Production professional environment.
There is a lot to read about this but the answer to ...
- 154
2
votes
Recording 720p source with 1080p
It is best to match the source dimensions with your recoding dimensions. Using a larger number of pixels requires more data or bandwidth to encode the scaled source. You wont be able to make a sharper ...
- 411
2
votes
Accepted
Lossless Capture with FFmpeg
libx264 is a very efficient encoder, so that bitrate isn't unusual. In fact, it's on the higher side, but since you're capturing a game, I expect there is constant motion involved, and your preset is ...
- 33.6k
2
votes
Accepted
Retrieve and decode V-Chip data from an aired digital TV stream
V-Chip is encoded in the Extended Data Services (XDS) that is part EIA-608 captions. How it is actually transported in/with the video depends the signal type and medium.
Analog: Encoded with the ...
- 2,404
2
votes
Accepted
How do you make video look natural?
You pretty much found it out yourself.
Use 24FPS, 1/48, Aperture around f4. (Depending on your sensor size)
You really can't get a 1:1 look as our eyes have a diffrent way to see the world than a ...
- 1,081
2
votes
Is a UK PAL video tape compatible with a continental Europe PAL VHS/S-VHS player in terms of video and sound
The UK PAL VHS tapes will play back in a German PAL deck. The actual method of audio recording is not related to the PAL specification. VHS records up to two linear audio tracks. HiFi capable decks ...
- 21
2
votes
Accepted
How to make scenes look continuous?
For future videos, you better have a defined reference in all videos. For example a clapperboard or a standardized grey card. Then you can match all videos during colour grading both regarding the ...
- 1,421
1
vote
Recording 720p source with 1080p
While it is true that you can sometimes gain additional sharpness by recording at higher resolution and then downsampling after you have finished any other changes you plan to make, that isn't ...
- 19.4k
1
vote
Frame capture from videos: I-frame vs P-frames
Intra frames (I-frames, keyframes) are independent of other frames - they contain the complete information for reconstructing the frame's image. There is no need for reading other frames and computing ...
- 1,592
1
vote
Accepted
Highest quality way to extract a still from video
I doubt there will be much difference in the rendering capabilities between any of the software you list, as long as they play the video correctly. The biggest quality loss has already happened when ...
- 13.8k
1
vote
What output video format for Kazam requires less cpu power?
VP8 and H.264 should essentially be the same demand due to them being similar.
RAW is well, RAW, each specific pixel data, with no methods of reducing file space, this can cause very large file ...
- 31
Only top scored, non community-wiki answers of a minimum length are eligible