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• Revision 1434f7695b : Skip ref frame mode search conditioned on predicted mv residuals This commit ma

  3 novembre 2014, par Jingning Han

  Changed Paths :
   Modify /vp9/encoder/vp9_pickmode.c

  
  
  Skip ref frame mode search conditioned on predicted mv residuals

  This commit makes the RTC coding mode to conditionally skip the
  reference frame mode search, when the predicted motion vector of
  the current reference frame gives more than two times sum of
  absolute difference compared to that of other reference frames.

  It reduces the runtim by 1% - 4% for speed -5 and -6. The average
  compression performance is improved by about 0.1% in both settings.

  It is of particular benefit to light change scenarios. The
  compression performance of test clip mmmovingvga.y4m is improved by
  6.39% and 15.69% at high bit rates for speed -5 and -6, respectively.

  Speed -5
  vidyo1 16555 b/f, 40.818 dB, 12422 ms ->
  16552 b/f, 40.804 dB, 12100 ms

  nik 33211 b/f, 39.138 dB, 11341 ms ->
  33228 b/f, 39.139 dB, 11023 ms

  mmmoving 33263 b/f, 40.935 dB, 13508 ms ->
  33256 b/f, 41.068 dB, 12861 ms

  Speed -6
  vidyo1 16541 b/f, 40.227 dB, 8437 ms ->
  16540 b/f, 40.220 dB, 8216 ms

  nik 33272 b/f, 38.399 dB, 7610 ms ->
  33267 b/f, 38.414 dB, 7490 ms

  mmmoving 33255 b/f, 40.555 dB, 7523 ms ->
  33257 b/f, 40.975 dB, 7493 ms

  Change-Id : Id2aef76ef74a3cba5e9a82a83b792144948c6a91

• avcodec/av1dec : parse and export Metadata OBUs

  5 mars 2023, par James Almer

  avcodec/av1dec : parse and export Metadata OBUs
  This includes Mastering Display, Content light level, and some ITU-T T35
  
  metadata like closed captions and HDR10+.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/av1dec.c
  • [DH] libavcodec/av1dec.h

• Node.js Stream Mp3 to http without having to save file

  21 août 2016, par user2758113

  I am trying to stream just audio from a youtube link straight to http with node.js.

  My code looks like this, I am using express 4.0.

  var express = require('express');
  
  var router = express.Router();
  
  var ytdl = require('ytdl');
  
  var ffmpeg = require('fluent-ffmpeg');
  
  var fs = require('fs');
  
  
  
  router.get('/', function(req, res) {
  
  
  
    var url = 'https://www.youtube.com/watch?v=GgcHlZsOgQo';
  
    var video = ytdl(url)
  
  
  
    res.set({
  
        "Content-Type": "audio/mpeg"
  
    })
  
  
  
    new ffmpeg({source: video})
  
        .toFormat('mp3')
  
        .writeToStream(res, function(data, err) {
  
          if (err) console.log(err)
  
        })
  
  
  
  });
  
  
  
  module.exports = router;

  Now, I’m able to stream the video’s audio to the response if I save the file then pipe it to the response, but I’d rather try to figure out some way to go from downloading to ffmpeg to response.

  Not sure if this is possible. The main goal is to keep it as light weight as possible, and not have to read from files.

  I’ve seen this code which is essentially what I’d like to do minus the saving to a file part.