For example, set the resolution to auto and let the online video plays,
How can I measure the bit rate of this video transmission?
I've captured a pcapng file, it should be under TCP, but which ones are transmitting video clips? How should I check?
Related
I have a rtsp stream from a pretty good camera (my mobile phone).
I am getting the stream using opencv:
cv2.VideoCapture(get_camera_stream_url(camera))
However, the image quality I get is way bellow my mobile phone camera. I understand that rtsp protocol may lower the resolution but still, the image quality is not good for OCR.
However, although I have a VIDEO stream, the object I am recording is a static one. So, it is expected that all frames from the video should more or less the same, except for noise or lighting issues.
I was wondering if it is possible to get a 10 seg video with several frames and combine it to a SINGLE frame with better sharpness, reducing the noise.
Is it viable? How?
Now, I have two options, a GoPro and an arduino OV7670 camera module, but if any better camera is available for image processing, I have the budget to buy (less than 100$).
For real time data processing go with the Arduino OV7670, because with the GoPro you would need a HDMI to Arduino video input. WiFi Preview on the GoPro has a ~1-3 second lag and its very low resolution.
I am working on a project, we want to minimize the size in the sound part of a video. I know we can use ACAudioSession to record a pure audio, and can set the quality detailed into sampling rate, number of channels.
But when I want to design a video taker which record records audio at the same time. I found for the AVCaptureSession, I can only set the quality of video and audio together using sessionPreset, which leads the quality of video and audio decrease at the same time.
I am wondering whether there is a way to keep the video in high quality while manage to reduce the size of audio when taking a video?
Appreciate for the help.
For a project I'm working on, I'm trying to stream video to an iPhone through its headphone jack. My estimated bitrate is about 200kbps (If i'm wrong about this, please ignore that).
I'd like to squeeze as much performance out of this bitrate as possible and sound is not important for me, only video. My understanding is that to stream a a real-time video I will need to encode it with some codec on-the-fly and send compressed frames to the iPhone for it to decode and render. Based on my research, it seems that H.265 is one of the most space efficient codecs available so i'm considering using that.
Assuming my basic understanding of live streaming is correct, how would I estimate the FPS I could achieve for a given resolution using the H.265 codec?
The best solution I can think of it to take a video file, encode it with H.265 and trim it to 1 minute of length to see how large the file is. The issue I see with this approach is that I think my calculations would include some overhead from the video container format (AVI, MKV, etc) and from the audio channels that I don't care about.
I'm trying to stream video to an iPhone through its headphone jack.
Good luck with that. Headphone jack is audio only.
My estimated bitrate is about 200kbps
At what resolution? 320x240?
I'd like to squeeze as much performance out of this bitrate as possible and sound is not important for me, only video.
Then, drop the sound streams all together. Really though, 200kbit isn't enough for video of any reasonable size or quality.
Assuming my basic understanding of live streaming is correct, how would I estimate the FPS I could achieve for a given resolution using the H.265 codec?
Nobody knows, because you've told us almost nothing about what's in this video. The bandwidth required for the video is a product of many factors, such as:
Resolution
Desired Quality
Color Space
Visual complexity of the scene
Movement and scene changes
Tweaks and encoding parameters (fast start? low latency?)
You're going to have to decide what sort of quality you're willing to accept, and decide subjectively what the balance between that quality and frame rate is. (Remember too that if there isn't much going on, you basically get frames for free since they take very little bandwidth. Experiment.)
The best solution I can think of it to take a video file, encode it with H.265 and trim it to 1 minute of length to see how large the file is.
Take many videos, typical of what you'll be dealing with, and figure it out from there.
The issue I see with this approach is that I think my calculations would include some overhead from the video container format (AVI, MKV, etc) and from the audio channels that I don't care about.
Your video stream won't have a container at all? Not even TS? You can use FFmpeg to dump the raw stream data for you.
How to find out the frame rate of a video ?How to do in C++ OpenCV?
I want to read the different number of video with respective of frames per second.
It has to work on all Video formats? .Avi, .MP4, .Flv
easy (just take with a grain of salt, see remarks below):
VideoCapture cap("ma.avi");
double fps = cap.get(CV_CAP_PROP_FPS);