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• How do I improve the quality of a video produced from still PNG images ?

  9 avril 2012, par cormullion

  I'm trying to create a video from a few hundred PNG images. The PNG images look OK to me, e.g. here are two in MacOS X Preview :

  

  They're about 1200 pixels square, 16 bit RGB, no transparency.

  But my attempt to make a few hundred of these into a video is encountering the following problem - nearly every frame has this yellow corruption (artefacts ?), that sort of blocky flickery stuff you see on poor quality videos :

  

  The ffmpeg command I'm using is something like this :

  ffmpeg -f image2 -i /tmp/image-%07d.png -vcodec mpeg4 -vb 20M -r 20 poincare.mov

  I've tried changing a few parameters, but I probably changed the wrong ones. Any idea which parameters I should be changing, and to what value ?

  Console output is :

   ffmpeg -f image2 -i /tmp/image-%07d.png -vcodec mpeg4 -vb 30M -r 30 poincare.mov
  
      FFmpeg version UNKNOWN, Copyright (c) 2000-2010 the FFmpeg developers
  
      built on Nov  9 2010 12:20:29 with gcc 4.2.1 (Apple Inc. build 5664)
  
      configuration: --prefix=/Users/worth/OtherApps/ffmpeg/ffmpeg/../local/x86_64 --enable-static --enable-shared --enable-gpl --enable-version3 --enable-libmp3lame --enable-pthreads --enable-libvorbis --enable-libx264 --enable-libxvid --enable-libspeex --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-libvpx --enable-memalign-hack --disable-debug --disable-stripping --arch=x86_64
  
    libavutil     50.33. 0 / 50.33. 0
  
    libavcore      0.12. 0 /  0.12. 0
  
    libavcodec    52.94. 3 / 52.94. 3
  
    libavformat   52.84. 0 / 52.84. 0
  
    libavdevice   52. 2. 2 / 52. 2. 2
  
    libavfilter    1.59. 0 /  1.59. 0
  
    libswscale     0.12. 0 /  0.12. 0
  
      Input #0, image2, from '/tmp/image-%07d.png':
  
    Duration: 00:08:55.44, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: png, rgb48be, 1200x1198, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  File 'poincare.mov' already exists. Overwrite ? [y/N] y
  
  [buffer @ 0x101301ae0] w:1200 h:1198 pixfmt:rgb48be
  
  [ffsink @ 0x101301d50] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'out'
  
  [scale @ 0x101302090] w:1200 h:1198 fmt:rgb48be -> w:1200 h:1198 fmt:yuv420p flags:0xa0000004
  
  Output #0, mov, to 'poincare.mov':
  
    Metadata:
  
      encoder         : Lavf52.84.0
  
      Stream #0.0: Video: mpeg4, yuv420p, 1200x1198, q=2-31, 30000 kb/s, 30 tbn, 30 tbc
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press [q] to stop encoding
  
  frame=13386 fps= 27 q=2.0 Lsize=  536132kB time=535.43 bitrate=8202.7kbits/s    
  
  video:535981kB audio:0kB global headers:0kB muxing overhead 0.028261%

• FFMPEG wmv conversion to flv

  25 novembre 2012, par Brandon Grossutti

  anyone using ffmpeg

  I have a fairly simple wmv exported by a user from movie maker with standard output and want to convert to .flv using

  C :>ffmpeg -i "E :\Jab Core 4 Recounters.wmv" -vcodec flv "C :\Net Projects\SVN\IntegratedAlgorithmics\src\MediaAdmin\MediaAdmin\bin\Debug\Movies\Jab Core 4 Recounters.flv" -ar 44100

  the output / error i receive is

  FFmpeg version 0.5, Copyright (c) 2000-2009 Fabrice Bellard, et al.
  
    configuration: --enable-gpl --enable-postproc --enable-swscale --enable-avfilt
  
  er --enable-avfilter-lavf --enable-pthreads --enable-avisynth --enable-libfaac -
  
  -enable-libfaad --enable-libmp3lame --enable-libspeex --enable-libtheora --enabl
  
  e-libvorbis --enable-libxvid --enable-libx264 --enable-memalign-hack
  
    libavutil     49.15. 0 / 49.15. 0
  
    libavcodec    52.20. 0 / 52.20. 0
  
    libavformat   52.31. 0 / 52.31. 0
  
    libavdevice   52. 1. 0 / 52. 1. 0
  
    libavfilter    0. 4. 0 /  0. 4. 0
  
    libswscale     0. 7. 1 /  0. 7. 1
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
    built on Mar 16 2009 16:09:18, gcc: 4.2.4 [Sherpya]
  
  [wmv3 @ 0x1c0d490]Extra data: 8 bits left, value: 0
  
  
  
  Seems stream 1 codec frame rate differs from container frame rate: 1000.00 (1000
  
  /1) -> 30.00 (30/1)
  
  Input #0, asf, from 'E:\Jab Core 4 Recounters.wmv':
  
    Duration: 00:01:55.99, start: 5.000000, bitrate: 813 kb/s
  
      Stream #0.0: Audio: wmav2, 48000 Hz, stereo, s16, 192 kb/s
  
      Stream #0.1: Video: wmv3, yuv420p, 640x480, 586 kb/s, 30 tbr, 1k tbn, 1k tbc
  
  
  
  Output #0, flv, to 'C:\Net Projects\SVN\IntegratedAlgorithmics\src\MediaAdmin\Me
  
  diaAdmin\bin\Debug\Movies\Jab Core 4 Recounters.flv':
  
      Stream #0.0: Video: flv, yuv420p, 640x480, q=2-31, 200 kb/s, 90k tbn, 30 tbc
  
  
  
      Stream #0.1: Audio: libmp3lame, 48000 Hz, stereo, s16, 64 kb/s
  
  Stream mapping:
  
    Stream #0.1 -> #0.0
  
    Stream #0.0 -> #0.1
  
  [wmv3 @ 0x1c0d490]Extra data: 8 bits left, value: 0
  
  [libmp3lame @ 0x1c0d8d0]flv does not support that sample rate, choose from (4410
  
  0, 22050, 11025).
  
  Could not write header for output file #0 (incorrect codec parameters ?)

  i added th -ar switch when i got the error the first time

  the codec info i have on the file is as follows

  General
  
  Complete name                    : E:\Jab Core 4 Recounters.wmv
  
  Format                           : Windows Media
  
  File size                        : 11.3 MiB
  
  Duration                         : 2mn 0s
  
  Overall bit rate mode            : Variable
  
  Overall bit rate                 : 780 Kbps
  
  Maximum Overall bit rate         : 949 Kbps
  
  Encoded date                     : UTC 2009-03-07 07:02:41.121
  
  Writing application              :  6.0.6000.16386 / Windows Movie Maker
  
  Application                      : Windows Movie Maker 6.0.6000.16386
  
  
  
  Video
  
  ID                               : 2
  
  Format                           : VC-1
  
  Format profile                   : MP@ML
  
  Codec ID                         : WMV3
  
  Codec ID/Info                    : Windows Media Video 9
  
  Codec ID/Hint                    : WMV3
  
  Duration                         : 2mn 0s
  
  Bit rate mode                    : Variable
  
  Bit rate                         : 587 Kbps
  
  Width                            : 640 pixels
  
  Height                           : 480 pixels
  
  Display aspect ratio             : 4/3
  
  Frame rate                       : 30.000 fps
  
  Resolution                       : 24 bits
  
  Scan type                        : Progressive
  
  Bits/(Pixel*Frame)               : 0.064
  
  Stream size                      : 8.46 MiB (75%)
  
  Language                         : en-us
  
  
  
  Audio
  
  ID                               : 1
  
  Format                           : WMA2
  
  Format profile                   : L3
  
  Codec ID                         : 161
  
  Codec ID/Info                    : Windows Media Audio 2
  
  Description of the codec         : Windows Media Audio 9.2 - VBR Quality 90, 48 kHz, stereo 1-pass VBR
  
  Duration                         : 2mn 0s
  
  Bit rate mode                    : Variable
  
  Bit rate                         : 186 Kbps
  
  Channel(s)                       : 2 channels
  
  Sampling rate                    : 48.0 KHz
  
  Resolution                       : 16 bits
  
  Stream size                      : 2.68 MiB (24%)
  
  Language                         : en-us

  i see alot of people with this issue with so solution or cause

  any ideas would be helpful
  thanks in advance

• live video streaming not playing on dash.js player using ffmpeg, nginx-rtmp in raspberry pi

  15 août 2016, par sparks

  I am trying to stream a live video from raspberry pi & pi camera module to web browser.But the video doesn’t play.I am using Nginx-rtmp and ffmpeg to process the video. On the client side i use dash js player trying to play the video but no luck.I see the warning on the terminal

  [flv @ 0x2c3b950] Failed to update header with correct duration.
[flv @ 0x2c3b950] Failed to update header with correct filesize.

  But i am not sure if this could be the issue. Anybody knows what might be wrong ?I don’t expect a straight answer but i am sure somebody can guide me in the right direction. Thank you in advance. Here is my set up

  Nginx.conf

  events {
  
    worker_connections  1024;
  
   }
  
  
  
  
  
   http     {
  
          include       mime.types;
  
          default_type  application/octet-stream;
  
  
  
  
  
  sendfile        on;
  
  
  
  keepalive_timeout  65;
  
  
  
  server {
  
      listen       80;
  
      server_name 192.168.1.114 localhost;
  
      location / {
  
          root   /var/www;
  
          index  index.html index.htm;
  
      }
  
  
  
  
  
      location /dash {
  
          root /var/www;
  
          add_header Cache-Control no-cache;
  
      }
  
  
  
       location /dash.js{
  
          root /var/www;
  
        }
  
  
  
       location /hls {
  
         types {
  
          application/vnd.apple.mpegurl m3u8;
  
          video/mp2t ts;
  
        }
  
  
  
        root /var/www;
  
        index index.html;
  
        add_header Cache-Control no-cache;
  
      }
  
  
  
      location /rtmpcontrol{
  
          rtmp_control all;
  
       }
  
  
  
      location /rtmpstat{
  
          rtmp_stat all;
  
       }
  
  
  
      #error_page  404              /404.html;
  
  
  
  
  
             error_page   500 502 503 504  /50x.html;
  
      location = /50x.html {
  
          root   html;
  
      }
  
  
  
         }
  
   rtmp {
  
     server {
  
      listen 1935;
  
  
  
      chunk_size 4000;
  
  
  
      application rtmp {
  
          live on;
  
          hls on;
  
          dash on;
  
          dash_path /var/www/dash;
  
          hls_path /var/www/hls;
  
      }
  
    }
  
  }

  baseline.html

      
  
      
  
      
  
      
  
  
  
      
  
      
  
  
  
      
  
      
  
  
  
      
  
      <code class="echappe-js">&lt;script src='http://stackoverflow.com/feeds/tag/dash.all.js'&gt;&lt;/script&gt;
  &lt;script&gt;<br />
  
          function getUrlVars() {<br />
  
              var vars = {};<br />
  
              var parts = window.location.href.replace(/[?&amp;amp;]+([^=&amp;amp;]+)=([^&amp;amp;]*)/gi, function(m,key,value) {<br />
  
                  vars[key] = value;<br />
  
              });<br />
  
              return vars;<br />
  
          }<br />
  
  <br />
  
          function startVideo() {<br />
  
              var vars = getUrlVars(),<br />
  
                  url = &quot;http://192.168.1.114:80/dash/stream.mpd&quot;,<br />
  
                  video,<br />
  
                  context,<br />
  
                  player;<br />
  
  <br />
  
              if (vars &amp;amp;&amp;amp; vars.hasOwnProperty(&quot;url&quot;)) {<br />
  
                  url = vars.url;<br />
  
              }<br />
  
  <br />
  
              video = document.querySelector(&quot;.dash-video-player video&quot;);<br />
  
              context = new Dash.di.DashContext();<br />
  
              player = new MediaPlayer(context);<br />
  
  <br />
  
              player.startup();<br />
  
  <br />
  
              player.attachView(video);<br />
  
              player.setAutoPlay(false);<br />
  
  <br />
  
              player.attachSource(url);<br />
  
          }<br />
  
      &lt;/script&gt;
      &lt;body onload=&quot;startVideo()&quot;&gt;
  
              
          
  

  How i grab and push video stream

   raspivid -w 640 -h 480 -fps 25 -t 0 -b 1800000 -o - | ffmpeg -y -f h264 -i - -vcodec libx264  -f flv -rtmp_buffer 100 -rtmp_live live rtmp://localhost:1935/rtmp/stream

  When i run the above command, i see the following on the terminal

      ffmpeg version N-81256-gd3426fb Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.9.2 (Raspbian 4.9.2-10)
  
    configuration: --enable-gpl --enable-libx264 --enable-nonfree
  
    libavutil      55. 28.100 / 55. 28.100
  
    libavcodec     57. 51.100 / 57. 51.100
  
    libavformat    57. 44.100 / 57. 44.100
  
    libavdevice    57.  0.102 / 57.  0.102
  
    libavfilter     6. 49.100 /  6. 49.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, h264, from 'pipe:':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: h264 (High), yuv420p, 640x480, 25 fps, 25 tbr, 1200k tbn, 50 tbc
  
  [tcp @ 0x2c3c850] Connection to tcp://localhost:1935 failed (Connection refused), trying next address
  
  [libx264 @ 0x2c50d80] using cpu capabilities: ARMv6 NEON
  
  [libx264 @ 0x2c50d80] profile High, level 3.0
  
  [libx264 @ 0x2c50d80] 264 - core 148 r2705 3f5ed56 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  [flv @ 0x2c3b950] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
  Output #0, flv, to 'rtmp://localhost:1935/rtmp/stream':
  
    Metadata:
  
      encoder         : Lavf57.44.100
  
      Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 640x480, q=-1--1, 25 fps, 1k tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc57.51.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
  ^Cmmal: Aborting program.0 size=     930kB time=00:00:45.44 bitrate= 167.7kbits/s speed=1.03x     
  
  
  
  [flv @ 0x2c3b950] Failed to update header with correct duration.
  
  [flv @ 0x2c3b950] Failed to update header with correct filesize.
  
  frame= 1197 fps= 26 q=-1.0 Lsize=     976kB time=00:00:47.76 bitrate= 167.5kbits/s speed=1.04x    
  
  video:953kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.484349%
  
  [libx264 @ 0x2c50d80] frame I:5     Avg QP:18.91  size:  3600
  
  [libx264 @ 0x2c50d80] frame P:299   Avg QP:21.38  size:  1486
  
  [libx264 @ 0x2c50d80] frame B:893   Avg QP:20.62  size:   574
  
  [libx264 @ 0x2c50d80] consecutive B-frames:  0.4%  0.0%  1.0% 98.6%
  
  [libx264 @ 0x2c50d80] mb I  I16..4: 10.1% 87.1%  2.8%
  
  [libx264 @ 0x2c50d80] mb P  I16..4:  3.8%  7.4%  0.0%  P16..4: 34.2%  2.1%  1.5%  0.0%  0.0%    skip:51.0%
  
  [libx264 @ 0x2c50d80] mb B  I16..4:  0.2%  0.3%  0.0%  B16..8: 20.1%  0.4%  0.0%  direct: 3.8%  skip:75.1%  L0:48.6% L1:50.9% BI: 0.6%
  
  [libx264 @ 0x2c50d80] 8x8 transform intra:68.1% inter:97.0%
  
  [libx264 @ 0x2c50d80] coded y,uvDC,uvAC intra: 10.1% 27.5% 1.8% inter: 2.0% 12.9% 0.1%
  
  [libx264 @ 0x2c50d80] i16 v,h,dc,p: 18% 20%  9% 53%
  
  [libx264 @ 0x2c50d80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 11% 58%  2%  2%  1%  2%  1%  1%
  
  [libx264 @ 0x2c50d80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 26% 30%  3%  4%  4%  6%  2%  2%
  
  [libx264 @ 0x2c50d80] i8c dc,h,v,p: 66% 18% 15%  1%
  
  [libx264 @ 0x2c50d80] Weighted P-Frames: Y:1.7% UV:1.3%
  
  [libx264 @ 0x2c50d80] ref P L0: 58.2%  2.2% 25.5% 14.1%  0.1%
  
  [libx264 @ 0x2c50d80] ref B L0: 81.7% 13.3%  5.0%
  
  [libx264 @ 0x2c50d80] ref B L1: 93.6%  6.4%
  
  [libx264 @ 0x2c50d80] kb/s:162.87
  
  Exiting normally, received signal 2.

  On my var/www/dash directory

   stream-0.m4a  stream-19200.m4a  stream-29200.m4a  
  
   stream-9600.m4a    stream-init.m4a  stream.mpd      stream-raw.m4v
  
   stream-0.m4v  stream-19200.m4v  stream-29200.m4v  stream-9600.m4v    stream-init.m4v  stream-raw.m4a