You can use libswscale from FFmpeg like this: #include <libswscale/swscale.h> SwsContext * ctx = sws_getContext(imgWidth, imgHeight, AV_PIX_FMT_RGB24, imgWidth, imgHeight, AV_PIX_FMT_YUV420P, 0, 0, 0, 0); uint8_t * inData[1] = { rgb24Data }; // RGB24 have one plane int inLinesize[1] = { 3*imgWidth }; // RGB stride sws_scale(ctx, inData, inLinesize, 0, imgHeight, dst_picture.data, dst_picture.linesize); Note that you … Read more
First you need to create a SwsContext (you need to do this only once) : struct SwsContext *resize; resize = sws_getContext(width1, height1, AV_PIX_FMT_YUV420P, width2, height2, PIX_FMT_RGB24, SWS_BICUBIC, NULL, NULL, NULL); You need two frames for conversion, frame1 is the original frame, you need to explicitly allocate frame2 : AVFrame* frame1 = avcodec_alloc_frame(); // this is … Read more
Use the mpdecimate filter, whose purpose is to “Drop frames that do not differ greatly from the previous frame in order to reduce frame rate.” This will generate a console readout showing which frames the filter thinks are duplicates. ffmpeg -i input.mp4 -vf mpdecimate -loglevel debug -f null – To generate a video with the … Read more
With re-encoding: ffmpeg -y -i seeing_noaudio.mp4 -vf “setpts=1.25*PTS” -r 24 seeing.mp4 Without re-encoding: First step – extract video to raw bitstream ffmpeg -y -i seeing_noaudio.mp4 -c copy -f h264 seeing_noaudio.h264 Remux with new framerate ffmpeg -y -r 24 -i seeing_noaudio.h264 -c copy seeing.mp4
For recent versions of Debian/Ubuntu (Debian 9+ or Ubuntu 16.04+) install the php-dev dependency package, which will automatically install the correct version of php{x}-dev for your distribution: sudo apt install php-dev Older versions of Debian/Ubuntu: For PHP 5, it’s in the php5-dev package. sudo apt-get install php5-dev For PHP 7.x (from rahilwazir comment): sudo apt-get … Read more
I’ve been playing around with this for a few days. That “ffmpegprogress” thing helped, but it was very hard to get to work with my set up, and hard to read the code. In order to show the progress of ffmpeg you need to do the following: run the ffmpeg command from php without it … Read more
To extract the audio stream without re-encoding: ffmpeg -i input-video.avi -vn -acodec copy output-audio.aac -vn is no video. -acodec copy says use the same audio stream that’s already in there. Read the output to see what codec it is, to set the right filename extension.
Seems like faststart support has been included in ffmpeg. FFmpeg Formats Documentation: -movflags faststart Run a second pass moving the moov atom on top of the file. This operation can take a while, and will not work in various situations such as fragmented output, thus it is not enabled by default.
Use the drawtext filter for simple text on video. If you need more complex timing, formatting, or dynamic text see the subtitles filter. This answer focuses on the drawtext filter. Example Print Stack Overflow in white text onto center of video, with black background box of 50% opacity: ffmpeg -i input.mp4 -vf “drawtext=fontfile=/path/to/font.ttf:text=”Stack Overflow”:fontcolor=white:fontsize=24:box=1:[email protected]:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2″ -codec:a … Read more
This should do the trick: ffmpeg -re -i infile.ext -g 52 \ -c:a aac -b:a 64k -c:v libx264 -b:v 448k \ -f mp4 -movflags frag_keyframe+empty_moov \ output.mp4 frag_keyframe causes fragmented output, empty_moov will cause output to be 100% fragmented; without this the first fragment will be muxed as a short movie (using moov) followed by … Read more