I know this is a really old question, but as Google seems to like it I thought it would be worth pointing out that I wrote a Node.js video streaming module (Github, or via NPM) that’s hopefully worth a look too.
If the JPEG encoding step is too performance intensive, you could always store the frames uncompressed as BMP images: ffmpeg -i file.mpg -r 1/1 $filename%03d.bmp This also has the advantage of not incurring more quality loss through quantization by transcoding to JPEG. (PNG is also lossless but tends to take much longer than JPEG to … Read more
I have tested by using object-fit: fill in CSS Works good. video { object-fit: fill; } From MDN (https://developer.mozilla.org/en-US/docs/Web/CSS/object-fit): The object-fit CSS property specifies how the contents of a replaced element should be fitted to the box established by its used height and width. Value: fill The replaced content is sized to fill the element’s … Read more
Combining the scene filter (for detecting scene changes) and the showinfo filter should achieve what you want: ffmpeg -i input.flv \ -filter:v “select=”gt(scene,0.4)”,showinfo” \ -f null \ – 2> ffout This command extracts all frames that differ from the previous frame by more than (gt) 0.4 (on a scale from 0 to 1). For these … Read more
The latest builds of FFMPEG include a new option “segment” which does exactly what I think you need. ffmpeg -i INPUT.mp4 -acodec copy -f segment -vcodec copy -reset_timestamps 1 -map 0 OUTPUT%d.mp4 This produces a series of numbered output files which are split into segments based on Key Frames. In my own testing, it’s worked … Read more
Add -vf format=yuv420p (or the alias -pix_fmt yuv420p) as an output option ffmpeg -framerate 30 -i input_%05d.png -vf format=yuv420p output.mp4 Otherwise ffmpeg will attempt to preserve as much color information as it can, but most players can only decode YUV 4:2:0.
Use the segment muxer to break the input into segments: ffmpeg -i testfile.mp4 -c copy -f segment -segment_time 1200 testfile_piece_%02d.mp4 This will split the source at keyframes, so segments may not be exactly 1200 seconds long. And the timestamps aren’t reset, so some players will fail to play the 2nd and latter segments. If playability … Read more
Use ffprobe Example 1: With keys / variable names ffprobe -v error -show_entries stream=width,height -of default=noprint_wrappers=1 input.mp4 width=1280 height=720 Example 2: Just width x height ffprobe -v error -select_streams v -show_entries stream=width,height -of csv=p=0:s=x input.m4v 1280×720 Example 3: JSON ffprobe -v error -select_streams v -show_entries stream=width,height -of json input.mkv { “programs”: [ ], “streams”: [ … Read more
Once published live stream to SRS, over RTMP by OBS, FFmpeg or other encoder, you could play the stream on other devices. Generally there are serval players, on both H5 or mobile: HLS, about 5~10s latency, easy to play, you only need a H5 video tag, or hls.js. HTTP-FLV, about 1~3s latency, also very easy, … Read more
You can watch the graph you created using GraphEdit, a tool from the DirectShow SDK. In GraphEdit, select File->Connect to remote Graph… In order to find your graph in the list, you have to register it in the running object table: void AddToRot( IUnknown *pUnkGraph, DWORD *pdwRegister ) { IMoniker* pMoniker; IRunningObjectTable* pROT; GetRunningObjectTable( 0, … Read more