joinllka.blogg.se - Python ffmpeg images to video

Same thing but using VLC to stream the live output to the web, Flash format: python capture.py | cvlc -demux=rawvideo -rawvid-fps= 30 -rawvid-width= 320 -rawvid-height= 240 -rawvid-chroma=RV24 -sout "#transcode There is no default, so this value must be specified explicitly.Īnd here’s a little something extra for the power users.

-pixel_format Set the input video pixel format.

-framerate Set input video frame rate.

Since there is no header in raw video specifying the assumed video parameters, the user must specify them in order to be able to decode the data correctly: Took a bunch of fiddling but I figured it out using the FFmpeg rawvideo demuxer: python capture.py | ffmpeg -f rawvideo -pixel_format bgr24 -video_size 640x480 -framerate 30 -i - foo.avi At least, that’s what seems to be coming off the camera.

I’m pretty sure the pixel order for the OpenCV image type (IplImage) is GBR, one byte per channel.

The captured frames are definitely 640×480.

SwScaler: 0x0 -> 640x480 is invalid scaling dimension Max_analyze_duration reachedĮstimating duration from bitrate, this may be inaccurate

Sadly, I can’t get the ffmpeg magic incantation quite right and it fails with libavutil 50.15. Now I want to pipe the output to ffmpeg as in: $ python capture.py | ffmpeg -f image2pipe -pix_fmt bgr8 -i -s 640x480 foo.avi Here’s a fairly straightforward example of reading off a web cam using OpenCV’s python bindings: '''capture.py''' import cv, sysĬap = cv.CaptureFromCAM( 0) # 0 is for /dev/video0 while True :