Briefly, the error means that you can’t use a static library to be linked w/ a dynamic one. The correct way is to have a libavcodec compiled into a .so instead of .a, so the other .so library you are trying to build will link well. The shortest way to do so is to add … Read more
getID3 supports video formats. See: http://getid3.sourceforge.net/ Edit: So, in code format, that’d be like: include_once(‘pathto/getid3.php’); $getID3 = new getID3; $file = $getID3->analyze($filename); echo(“Duration: “.$file[‘playtime_string’]. ” / Dimensions: “.$file[‘video’][‘resolution_x’].” wide by “.$file[‘video’][‘resolution_y’].” tall”. ” / Filesize: “.$file[‘filesize’].” bytes<br />”); Note: You must include the getID3 classes before this will work! See the above link. Edit: If … Read more
After looking around the net. The only working solution I found is supplied by Bambuser which ported ffmpeg to use in their android application. Code is here: http://bambuser.com/opensource Basically you copy the .so files to your jni/lib directory, along with any .h files you might need, create a JNI wrapper through javah, and it works. … Read more
ffprobe ffprobe -v error -select_streams v:0 -count_packets -show_entries stream=nb_read_packets -of csv=p=0 input.mp4 This actually counts packets instead of frames but it is much faster. Result should be the same. If you want to verify by counting frames change -count_packets to -count_frames and nb_read_packets to nb_read_frames. What the ffprobe options mean -v error This hides “info” … Read more
I enclosed C++ code for grabbing frames. It requires OpenCV version 2.0 or higher. The code uses cv::mat structure which is preferred to old IplImage structure. #include “cv.h” #include “highgui.h” #include <iostream> int main(int, char**) { cv::VideoCapture vcap; cv::Mat image; const std::string videoStreamAddress = “rtsp://cam_address:554/live.sdp”; /* it may be an address of an mjpeg stream, … Read more
Caveat: I’ve never used ffmpeg, but in working with other questions concerning the program, it appears that, like ssh, ffmpeg reads from standard input without actually using it, so the first call to Convert is consuming the rest of the file list after read gets the first line. Try this Convert() { ffmpeg -i “$1” … Read more
This answer is written with Linux and Python in mind, but the general idea can be applied to any OS and language supported by OpenCV. The VideoCapture class not opening the video file can have many causes, but the following three applies to most cases. OpenCV FFMPEG support: By default OpenCV uses ffmpeg to read … Read more
Replace audio ffmpeg -i video.mp4 -i audio.wav -map 0:v -map 1:a -c:v copy -shortest output.mp4 The -map option allows you to manually select streams / tracks. See FFmpeg Wiki: Map for more info. This example uses -c:v copy to stream copy (mux) the video. No re-encoding of the video occurs. Quality is preserved and the … Read more
The answer to the original question should not scale the video but instead fix the height not divisible by 2 error. This can be achieve using this filter: -vf “pad=ceil(iw/2)*2:ceil(ih/2)*2” Full command: ffmpeg -i frame_%05d.jpg -vcodec libx264 \ -vf “pad=ceil(iw/2)*2:ceil(ih/2)*2” -r 24 \ -y -an video.mp4 Basically, .h264 needs even dimensions so this filter will: … Read more
Examples to add a watermark / logo image on video using the overlay filter. Centered ffmpeg -i input.mp4 -i logo.png -filter_complex “overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2” -codec:a copy output.mp4 or with the shortened overlay options: overlay=(W-w)/2:(H-h)/2 Top left This is the easy one because the default, if you provide no options to overlay, is to place the image in … Read more