NO!!! You must run a complex function to extract video dimensions from Sequence Parameter Sets. How to do this? Well first you must write your own Exp-Golomb decoder, or find one online… in live555 source code somewhere there is one for example… Then you must get one SPS frame. It has NAL=0x67 (NAL is the … Read more
Just put “?autoplay=1” in the url the video will autoload. So your url would be: http://www.youtube.com/embed/JW5meKfy3fY?autoplay=1 In case you wanna disable autoplay, just make 1 to 0 as ?autoplay=0
To output the codec_type ffprobe -loglevel error -show_entries stream=codec_type -of default=nw=1 input.foo Example result: codec_type=video codec_type=audio If you have multiple audio or video streams the output will show multiple video or audio entries. Same as above but output just the values ffprobe -loglevel error -show_entries stream=codec_type -of default=nw=1=nk=1 input.foo or: ffprobe -loglevel error -show_entries stream=codec_type … Read more
Ok, so for the last few day’s I’ve really been struggling with this issue. Here is my analysis and solution: In short the problem I tried to solve: I noticed that the HTML5 player does not stop downloading when the player is paused (at all, not even after a reasonable amount of time). Working with … Read more
I just came up with a general solution, which should work on most websites. I tried this on Chrome only, but this method should work with any other browser, though, as Dev Tools are pretty much the same in them all. Steps: Open the browser’s Dev Tools (usually F12, or Ctrl-Shift-I, or right-click and then … Read more
1) CMTimeMake(1,10) actually means a value of 1 and a timescale of 10. They are a numerator and denominator, so it is 1/10 of a second, not 1 second. 2) The result will be like CMTimeMake(2, 10), which is 2/10ths of a second.
Modern containers govern the time component of presentation of video (and audio) frames using timestamps, rather than framerate. So, instead of recording a video as 25 fps, and thus implying that each frame should be drawn 0.04 seconds apart, they store a timestamp for each frame e.g. Frame pts_time 0 0.00 1 0.04 2 0.08 … Read more
Use -qscale:v to control quality Use -qscale:v (or the alias -q:v) as an output option. Normal range for JPEG is 2-31 with 31 being the worst quality. The scale is linear with double the qscale being roughly half the bitrate. Recommend trying values of 2-5. You can use a value of 1 but you must … 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
var canvas = document.getElementById(‘canvas’); var ctx = canvas.getContext(‘2d’); var video = document.getElementById(‘video’); video.addEventListener(‘play’, function () { var $this = this; //cache (function loop() { if (!$this.paused && !$this.ended) { ctx.drawImage($this, 0, 0); setTimeout(loop, 1000 / 30); // drawing at 30fps } })(); }, 0); I guess the above code is self Explanatory, If not drop … Read more