Recherche avancée

Sur d’autres sites (3973)

• Stream to youtube from xvfb using ffmpeg and x11grab

  13 décembre 2017, par Ivan Sergeev

  I want to make stream from virtual display to youtube via ffmpeg.
  I’m using this code :

  #! /bin/bash
  
  
  
  BITRATE="2500k"                                    
  
  FPS="30"                                       
  
  
  
  YOUTUBE_URL="rtmp://a.rtmp.youtube.com/live2"  
  
  YOUTUBE_KEY="..."                                     
  
  
  
  SOURCE="./test.mp4"
  
  
  
  export DISPLAY=44
  
  sudo xvfb-run -a -n 44 -l -s "-screen 0, 1280x720x24" google-chrome -start-maximized https://upload.wikimedia.org/wikipedia/commons/2/2c/Rotating_earth_%28large%29.gif --no-sandbox >/dev/null &
  
  
  
  ffmpeg -threads 0 -y -v verbose -re \
  
   -f x11grab -video_size 1280x720 -i :44 \
  
   -vcodec libx264 -pix_fmt yuv420p -preset ultrafast -r $FPS -g $(($FPS * 2)) -b:v $BITRATE -bufsize 512k \
  
   -acodec libmp3lame -ar 44100 -threads 0 -crf 25 -b:a 712000 -bufsize 512k \
  
   -f flv "$YOUTUBE_URL/$YOUTUBE_KEY"

  And I don’t receive any errors, but youtube cannot start stream(

  In my log :

  Stream mapping:
  
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  frame=    4 fps=0.0 q=17.0 size=      72kB time=00:00:00.50 bitrate=1186.9kbits/s
  
  frame=    6 fps=5.9 q=17.0 size=     106kB time=00:00:00.93 bitrate= 931.2kbits
  
  frame=    8 fps=5.3 q=17.0 size=     141kB time=00:00:01.36 bitrate= 846.4kbits/s
  
  frame=   11 fps=5.4 q=16.0 size=     188kB time=00:00:02.00 bitrate= 771.9kbits/s
  
  frame=   13 fps=5.2 q=15.0 size=     217kB time=00:00:02.43 bitrate= 730.5kbits/s
  
  frame=   15 fps=5.0 q=14.0 size=     241kB time=00:00:02.86 bitrate= 687.2kbits/s
  
  frame=   18 fps=5.1 q=14.0 size=     270kB time=00:00:03.53 bitrate= 625.2kbits/s
  
  frame=   20 fps=4.9 q=15.0 size=     294kB time=00:00:03.96 bitrate= 608.3kbits/s

  etc.

  However, if I do stream from file, but not x11grab stream is starting normal.

  What I’m doing wrong ?
  Any ideas, guys, please)

• FFmpeg error : ratecontrol_init : can't open stats file

  6 octobre 2017, par oldo.nicho

  I’ve setup an AWS EC2 instance running Ubuntu 14.04 and have installed FFmpeg so that I can compress and transcode video.

  I’m trying to do a two pass conversion with the following code :

  ffmpeg -i input-file.avi -codec:v libx264 -profile:v high -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -vf scale=702:-1 -threads 0 -pass 1 -an -f mp4 ~/encoded/null

  and second pass :

  ffmpeg -i input-file.avi -codec:v libx264 -profile:v high -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -vf scale=702:-1 -threads 0 -pass 2 -codec:a libfdk_aac -b:a 128k -f mp4 output-file.mp4

  However I get the following error :

  ffmpeg version N-77283-g91c2a33 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  
    configuration: --prefix=/home/ubuntu/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/ubuntu/ffmpeg_build/include --extra-ldflags=-L/home/ubuntu/ffmpeg_build/lib --bindir=/home/ubuntu/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree
  
    libavutil      55. 11.100 / 55. 11.100
  
    libavcodec     57. 17.100 / 57. 17.100
  
    libavformat    57. 20.100 / 57. 20.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 21.100 /  6. 21.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, avi, from 'input-file.avi':
  
    Duration: 01:18:05.29, start: 0.000000, bitrate: 2025 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile) (XVID / 0x44495658), yuv420p, 720x480 [SAR 1:1 DAR 3:2], 1789 kb/s, 29.97 fps, 29.97 tbr, 29.97 tbn, 29.97 tbc
  
      Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, fltp, 224 kb/s
  
  [libx264 @ 0x1e04240] using SAR=1/1
  
  [libx264 @ 0x1e04240] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
  
  [libx264 @ 0x1e04240] ratecontrol_init: can't open stats file
  
  Output #0, mp4, to '/home/ubuntu/encoded/null':
  
      Stream #0:0: Video: h264, none, q=2-31, 128 kb/s, SAR 1:1 DAR 0:0, 29.97 fps
  
      Metadata:
  
        encoder         : Lavc57.17.100 libx264
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg4 (native) -> h264 (libx264))
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  The command as written above works fine on my local computer (running OSX). Would anyone have any suggestions as to how to fix this problem ?

• Create video Thumbnail using Node js Error

  15 juillet 2017, par Andrea

  I want to create a video thubmbnail through fluent-ffmpeg library, the problems are that I don´t know if I need to create a folder to store the images, and how and where to create it. Also Im getting this error ffmpeg stdout: undefined, the complete code below :

  ffmpeg("http://upload.wikimedia.org/wikipedia/commons/7/79/Big_Buck_Bunny_small.ogv")
  
                      .on('filenames', function(filenames) {
  
                          console.log('Will generate ' + filenames.join(', ') + ' into tempfiles.')
  
                      })
  
                      .on('end', function() {
  
                          console.log('1 Screen shot successfully taken');
  
  
  
                      })
  
                      .on('error', function(err, stdout, stderr) {
  
                          console.log("ffmpeg stdout:\n" + stdout);
  
                          console.log("ffmpeg stderr:\n" + stderr);
  
                      })
  
                      .screenshots({
  
                          count: 1,
  
                          filename: "file_name",
  
                          size: '240x240',
  
                      });

  also how can I get the byte[] from that screenshot, so I can use it later in my code ?