13
votes
Accepted
Using h264 in loseless mode brings small unexpected results
It's an artifact of the player, not the encoder.
I used the command below to generate a RGB format capture in HuffYUV
ffmpeg -f dshow -video_size 1920x1080 -framerate 30 -i video="screen-capture-...
- 31.8k
6
votes
Accepted
Using ffmpeg with avfoundation, capture_cursor and capture_mouse_clicks options are ignored
Place those options before -i "1"
In ffmpeg, parameters and flags apply to the next input/output entry.
So,
ffmpeg {-flags for input1} -i input1 {-flags for input2} -i input2 {-flags for output1} ...
- 31.8k
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 =...
- 1,050
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 ...
- 2,467
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:
...
- 31.8k
3
votes
How should I encode my 4K video stream?
As mentioned by @Mulvya, I think the issue is the "slow" preset.
One option is encoding a compressed stream that is also lossless. For example, the x264 encoder can do this using "-preset ultrafast -...
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
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 ...
- 4,674
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 ...
- 2,281
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 ...
- 476
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 ...
- 13.6k
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 ...
- 2,405
2
votes
Crop Video temporary
FFMpeg might do what you need. It's pretty powerful commandline tool to convert video formats, sizes, etc.
Here is a clear and simple tutorial for installing FFMpeg and using basic functions
Here is ...
- 390
2
votes
Accepted
Record raw video with ffmpeg keeping the full color range
In this case, the problem didn't come from ffmpeg/avconv.
The rawvideo source I use offers different color formats to be used:
argb32
rgb24
bgr24
yuv444
yuv420
[...]
When I extract a png file (...
- 151
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
How to capture 4K screens?
As you know there are two solutions, one using your CPU, the other a dedicated GPU.
CPU Solution
As of today, the CPU solution exit for 4K content, at 60 fps, using x265 or x264 codec. x264 is ...
- 163
2
votes
Accepted
Flicker in the Capture, LED light source
Here is a blog posting from one of the leading LED fixture manufacturers, SORAA. (Their chief scientist won the Nobel Prize for the invention of the blue LED.) One of the design problems is that a ...
- 4,730
2
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=...
- 31.8k
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
Focus in Video vs Focus in Image
Focus is focus is focus, whether for still or video. But the story does not end there. Focal length, aperture, sensor size, circle of confusion, etc., all play a role in determining whether you ...
- 4,730
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
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 ...
- 2,405
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.
- 31.8k
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
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
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 ...
- 31.8k
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 ...
- 2,405
Only top scored, non community-wiki answers of a minimum length are eligible