Recherche avancée

Sur d’autres sites (11068)

• Revision 1092140379 : No longer use use_lastframe_partitioning speed feature The speedup in rd_pick_p

  6 septembre 2014, par Yunqing Wang

  Changed Paths :
   Modify /vp9/encoder/vp9_speed_features.c

  
  
  No longer use use_lastframe_partitioning speed feature

  The speedup in rd_pick_partition() function makes it possible
  to drop use_lastframe_partitioning feature. By doing that, we
  achieve good PSNR gain with small speed loss. Also, this makes
  encoding loop less complicated. The code cleanup patch will
  follow.

  Borg tests showed :
  1. At speed 2,
  stdhd set : 0.201% PSNR gain, 0.133% SSIM gain ;
  derf set : 0.262% PSNR gain, 0.276% SSIM gain.
  2. At speed 3,
  stdhd set : 0.139% PSNR gain, 0.109% SSIM gain ;
  derf set : 0.447% PSNR gain, 0.442% SSIM gain.

  The average speed loss over selected test clips is within 1%
  with the worst case of 4%.

  Change-Id : Icfd2ded7869372b585a6972855d933b3d0280d90

• ffmpeg to rip mp3 from mp4 in ruby

  11 septembre 2014, par RichardC

  Trying to make basic Ruby script utilising ffmpeg to download a video from Youtube and then rip the mp3 from that video.
  Problem is each time the script fails when trying to separate the two, even though the command themselves run fine outside of the.
  I think the issue is that Ruby is treating the video as a string, but I’m not sure.

  def input
  
      #print "Enter Video URL: "
  
      #@target_video = gets
  
      #@target_video ||= ''
  
      #@target_video.chomp
  
      @target_video = 'https://www.youtube.com/watch?v=bYG1qccSUAw'
  
  end
  
  
  
  def grab
  
      #@video = `viddl-rb #{@target_video}`
  
      `viddl-rb #{@target_video}`
  
  end
  
  
  
  def rip
  
      `ffmpeg -i #{grab} new.mp3`
  
  end
  
  
  
  input
  
  rip

  I tested it in irb and when I tried @video.class it returned string, I think this is where it’s going wrong but I’m not certain.
  The video does download successfully but fails on teh rip.

  Output and error :

  ruby youtube_downloader.rb 
  
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
  
                                   Dload  Upload   Total   Spent    Left  Speed
  
  100 30.4M  100 30.4M    0     0  2580k      0  0:00:12  0:00:12 --:--:-- 2683k
  
  ffmpeg version 2.3.3 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Aug 25 2014 19:47:15 with Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.3.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  
    libavutil      52. 92.100 / 52. 92.100
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 48.100 / 55. 48.100
  
    libavdevice    55. 13.102 / 55. 13.102
  
    libavfilter     4. 11.100 /  4. 11.100
  
    libavresample   1.  3.  0 /  1.  3.  0
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Loading: No such file or directory
  
  sh: line 1: Plugins: command not found
  
  sh: line 2: Will: command not found
  
  sh: line 3: Analyzing: command not found
  
  sh: line 4: Using: command not found
  
  sh: line 5: [YOUTUBE]: command not found
  
  sh: line 6: [YOUTUBE]: command not found
  
  sh: line 7: Using: command not found
  
  sh: line 8: Download: command not found
  
  sh: line 9: Error:: command not found
  
  sh: line 11: Backtrace:: command not found
  
  sh: -c: line 12: syntax error near unexpected token `:27:in'
  
  sh: -c: line 12: `(eval):27:in `initialize''

• Handling correctly the ffmpeg & ffprobe with php

  29 septembre 2014, par cocco

  Handling correctly the ffmpeg & ffprobe with php

  maybe not relevant final goals :

  1. upload clip with ajax
  2. get ajax info from ffprobe using php as json executing ffprobe once only (no ffmpeg)
  3. handle all calculations with javascript
  4. maybe an extra php script tool that can create gifs, extract frames(thumbs), or a video grid preview
  5. when rdy ajax the conversion info to the final php conversion script executing ffmpeg once only (just the final ffmpeg string.).

  I’m trying to write my own ffmpeg local web video editor that converts all formats to mp4 automatically. As mp4 is the most compatible container now and the h264+aac/+ac3 is also one of the best compressions. I also want to be able to cut, crop, resize, remove streams, add streams and more. I’m stuck on some simple problems :

  1. HOW TO GET THE INFO ?

  I’m using ffprobe to get the file information as json with the following command :

  ffprobe -v quiet -print_format json -show_format -show_streams -show_packets '.$video

  this gives you a lot of information, but some relevant stuff is not always present. I need the duration (in milliseconds),the fps (as a float) and the total frames (as an integer).

  i know that these values can sometimes be found inside this array :

  format.duration //Total duration
  
  streams[0].duration //Video duration
  
  streams[1].duration //Audio duration
  
  
  
  streams[0].avg_frame_rate //Average framerate
  
  streams[0].r_frame_rate //Video framerate
  
  
  
  streams[0].nb_frames //Total frames

  but most of the time nb_frames is missing, also avg_frame_rate differs from r_frame_rate, which is also not always available.

  I know that i could use multiple commands to increase the chance to get the correct values.. but srsly ???

  //fps
  
  ffmpeg -i INPUT 2>&1 | sed -n "s/.*, \(.*\) fp.*/\1/p" 
  
  //duration
  
  ffmpeg -i INPUT 2>&1 | awk '/Duration/ {split($2,a,":");print a[1]*3600+a[2]*60+a[3]}'
  
  //frames
  
  ffmpeg -i INPUT -vcodec copy -f rawvideo -y /dev/null 2>&1 | tr ^M '\n' | awk '/^frame=/ {print $2}'|tail -n 1

  I don’t want to execute ffmpeg 3 times to get this information ; I’d prefer to just use ffprobe.

  So... is there an elegant way to get the extra info that is not always present inside the ffprobe output (fps, frames, duration) ???

  In the preview i want to be able to jump correctly to a specific frame (NOT TIME). if the above parameters are aviable i can do that using this command.

  ffmpeg -i INPUT -vf 'select=gte(n\,FRAMENUMBER)' -vframes 1 -f image2 OUTPUT

  using the above command by setting the framenumber to the last frame always returns a black frame.
  if there are 50 frames (for example) the range is 1-50 — correct ? Frame 50 is black, frame 1 is ok, frame 0 returns an error...

  ---

  2. WHILE READING THE LOG HOW TO SKIP ERRORS AND DETERMINE IF THE CONVERSION IS FINISHED ?

  I’m able to upload one single video per time (per page) and i can read the current progress from the ffmpeg generated output log until i don’t close the page. more control/multiple conversions would be nice.

  i’m reading the last line of the log with a custom tail function but as this is a log that also includes errors i don’t always get a nice line containing the desidered values. btw to check if the progress is complete i check if the last line CONTAINS the WORD frame ....

  How can i find out when the conversion progress is finished ?

  maybe a way to delete the log with ffmpeg command ??And skip/log the errors ??

  i’m using server sent events to read the log...
  here is the php code

  <?php
  
  setlocale(LC_CTYPE, "en_US.UTF-8");
  
  function tailCustom($filepath,$lines=1,$adaptive=true){
  
   // a custom function to get the last line of a textfile.
  
  }
  
  function send($data){
  
   echo "id: ".time().PHP_EOL;
  
   echo "data: ".$data.PHP_EOL;
  
   echo PHP_EOL;
  
   ob_flush();
  
   flush();
  
  }
  
  header('Content-Type: text/event-stream');
  
  header('Cache-Control: no-cache');
  
  while(true){
  
   send(tailCustom($_GET['log'].".log"));
  
   sleep(1);
  
  }
  
  ?>

  And here the SSE js

  function startSSE(fn){
  
   sse=new EventSource("ffmpegProgress.php?log="+encodeURIComponent(fn));
  
   sse.addEventListener('message',conversionProgress,false);
  
  }
  
  function conversionProgress(e){
  
   if(e.data.substr(0,6)=='frame='){
  
    inProgress=true;
  
    var x=e.data.match(/frame=\s*(.*?)\s*fps=\s*(.*?)\s*q=\s*(.*?)\s*size=\s*(.*?)\s*time=\s*(.*?)\s*bitrate=\s*(.*?)\s*$/);
  
    x.shift();x={frame:x[0]*1,fps:x[1]*1,q:x[2],size:x[3],time:x[4],bitrate:x[5]};
  
  var elapsedTime = ((new Date().getTime()) - startTime);
  
  var chunksPerTime = timeString2ms(x.time) / elapsedTime;
  
  var estimatedTotalTime = duration / chunksPerTime;
  
  var timeLeftInSeconds = Math.abs(elapsedTime-(estimatedTotalTime*1000));
  
  var withOneDecimalPlace = Math.round(timeLeftInSeconds * 10) / 10;
  
    conversion.innerHTML='Time Left: '+ms2TimeString(timeLeftInSeconds).split('.')[0]+'<br />'+
  
    'Time Left2: '+(ms2TimeString(((frames-x.frame)/x.fps)*1000)+(timeString2ms(x.time)/(duration*1000)*100|0)).split('.')[0]+'<br />'+
  
    'Estimated Total: '+ms2TimeString(estimatedTotalTime*1000).split('.')[0]+'<br />'+
  
    'Elapsed Time: '+ms2TimeString(elapsedTime).split('.')[0];
  
   }else{
  
    if(inProgress){
  
     sse.removeEventListener('message',conversionProgress,false);
  
     sse.close();
  
     sse=null;
  
     conversion.textContent='Finished in '+ms2TimeString((new Date().getTime()) - startTime).split('.')[0];
  
     //delete log/old file??
  
     inProgress=false;
  
    }
  
   }
  
  }

  EDIT

  HERE IS A SAMPLE OUTPUT after detecting h264 codec in a m2ts with ac3 audio

  As most devices can already read h264 i just need to convert the audio in aac and copy the same audio AC3 as second track. and put everything inside a mp4 container. So that i have a Android/chrome/ios & more browsers compatible file.

  $opt="-map 0:0 -map 0:1 -map 0:1 -c:v copy -c:a:0 libfdk_aac -metadata:s:a:0 language=ita -b:a 128k -ar 48000 -ac 2 -c:a:1 copy -metadata:s:a:1 language=ita -movflags +faststart";
  
  
  
  $i="in.m2ts";
  
  $o="out.mp4";
  
  $t="title";
  
  $y="2014";
  
  $progress="nameoftheLOG.log";
  
  
  
  $cmd="ffmpeg -y -i ".escapeshellarg($i)." -metadata title=".$t." -metadata date=".$y." ".$opt." ".$o." null >/dev/null 2>".$progress." &";

  if you have any questions about the code or want to see more code just ask...