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• ffmpeg audio video synchronisation mux

  19 juillet 2013, par Rahul Kumar

  I am trying to mux audio and video but the resultant is not what expected. The video is not shown in the output.

  rahul@hp : $ ffmpeg -i /Desktop/a.m4a -i /Desktop/a.mp4 -acodec copy -vcodec copy /Desktop/output.mkv
  ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
    built on Apr  2 2013 17:00:59 with gcc 4.6.3
  *** THIS PROGRAM IS DEPRECATED ***
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/rahul/Desktop/a.m4a' :
    Metadata :
      major_brand : dash
      minor_version : 0
      compatible_brands : iso6mp41
      creation_time : 2013-05-17 06:34:22
    Duration : 00:16:41.01, start : 500.506122, bitrate : 127 kb/s
      Stream #0.0(und) : Audio : aac, 44100 Hz, stereo, s16
      Metadata :
        creation_time : 2013-05-17 06:34:22
  Seems stream 0 codec frame rate differs from container frame rate : 47.95 (48000/1001) -> 23.97 (45000/1877)
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/home/rahul/Desktop/a.mp4' :
  
    Metadata :
  
      major_brand : dash
  
      minor_version : 0
  
      compatible_brands : iso6avc1mp41
  
      creation_time : 2013-05-17 06:34:22
  
    Duration : 00:16:40.61, start : 500.316311, bitrate : 675 kb/s
  
      Stream #1.0(und) : Video : h264 (Main), yuv420p, 1280x720, 23.97 tbr, 90k tbn, 47.95 tbc
  
      Metadata :
  
        creation_time : 2013-05-17 06:34:22
  
  Output #0, matroska, to '/home/rahul/Desktop/output.mkv' :
  
    Metadata :
  
      major_brand : dash
  
      minor_version : 0
  
      compatible_brands : iso6mp41
  
      creation_time : 2013-05-17 06:34:22
  
      encoder : Lavf53.21.1
  
      Stream #0.0(und) : Video : avc1 / 0x31637661, yuv420p, 1280x720, q=2-31, 1k tbn, 23.98 tbc
  
      Metadata :
  
        creation_time : 2013-05-17 06:34:22
  
      Stream #0.1(und) : Audio : aac, 44100 Hz, stereo
  
      Metadata :
  
        creation_time : 2013-05-17 06:34:22
  
  Stream mapping :
  
    Stream #1.0 -> #0.0
  
    Stream #0.0 -> #0.1
  
  Press ctrl-c to stop encoding
  
  frame=    0 fps=  0 q=-1.0 Lsize=   15643kB time=500.51 bitrate= 256.0kbits/s    
  
  video:0kB audio:15493kB global headers:0kB muxing overhead 0.967810%
  
  rahul@hp : $
  

  i tried using

  -map 0:v:0

  -map 1:v:0

  -map 0:v:1

  but all showed

  Number of stream maps must match number of output streams
  

• ffmpeg gives an error Option movflags not found

  12 juillet 2013, par Hemant

  In Ubuntu 12.04 LTS I have used -movflags frag_keyframe+empty_moov in my ffmpeg command :

  ffmpeg -i http://filesbe.vocativ.internal.net/03/44/SN/q1/xg/xl/0344SNq1xgxl.flv \
  
  -crf 32.0 -g 250 -keyint_min 25 -aspect 4:3  -movflags frag_keyframe -vcodec \
  
  libx264 -acodec aac -strict experimental -ar 44100 -ac 2 -b:a 128k -map 0:0 \
  
  -map 0:1 -f flv -y test.flv
  
  
  
  ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
  
    built on Apr  2 2013 17:02:36 with gcc 4.6.3
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  [flv @ 0x10569a0] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, flv, from 'http://filesbe.vocativ.internal.net/03/44/SN/q1/xg/xl/0344SNq1xgxl.flv':
  
    Metadata:
  
      starttime       : 0
  
      totalduration   : 64
  
      totaldatarate   : 710
  
      bytelength      : 5674798
  
      canseekontime   : true
  
      sourcedata      : BADC23401MH1326550770698632
  
      purl            :
  
      pmsg            :
  
    Duration: 00:01:03.96, start: 0.000000, bitrate: 718 kb/s
  
      Stream #0.0: Video: h264 (Main), yuv420p, 854x480, 590 kb/s, 25 tbr, 1k tbn, 50 tbc
  
      Stream #0.1: Audio: aac, 44100 Hz, stereo, s16, 128 kb/s
  
  [buffer @ 0x105c600] w:854 h:480 pixfmt:yuv420p
  
  [movie @ 0x105c440] seek_point:0 format_name:(null) file_name:/home/assetproxy/htdocs/transcoder/helper_asset/voca_scaled.png stream_index:0
  
  [overlay @ 0x1060840] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed filter 0 movie' and the filter 'Parsed filter 1 overlay'
  
  [scale @ 0x11d8300] w:90 h:51 fmt:rgb24 -> w:90 h:51 fmt:yuva420p flags:0x4
  
  [overlay @ 0x1060840] main w:854 h:480 fmt:yuv420p overlay x:754 y:419 w:90 h:51 fmt:yuva420p
  
  [overlay @ 0x1060840] main_tb:1/1000000 overlay_tb:1/25 -> tb:1/1000000 exact:1
  
  [libx264 @ 0x1059d20] using SAR=191/255
  
  [libx264 @ 0x1059d20] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
  
  [libx264 @ 0x1059d20] profile Main, level 3.0
  
  [libx264 @ 0x1059d20] 264 - core 120 r2151 a3f4407 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=6 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=0 b_adapt=1 b_bias=0 direct=1 weightb=0 open_gop=1 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=32.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.41 aq=1:1.00
  
  Option movflags not found.

• Making ffmpeg/javacv less verbose in java

  27 août 2013, par lejlot

  I have a Java application that uses ffmpeg library and javacv to load and process video files.

  I am currently using following code, for loading videofile to my data container.

  public boolean add(String videofile) {
  
          FrameGrabber g = new OpenCVFrameGrabber( videofile );
  
          try{ 
  
              g.start();
  
          }
  
          catch(Exception e){
  
              g = new FFmpegFrameGrabber( videofile );
  
              try {
  
                  g.start();
  
              }catch(Exception x){
  
                  return false;
  
              }
  
          }
  
          grabbers.add( new Pair(videofile, g) );
  
          frames.add( 0 );
  
          preprocessed=false;
  
          return true;        
  
      }

  Each time video is loaded, a library outputs a lot of meta information regarding video itself :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/lejlot/data/test.mp4' :
  Metadata :
  major_brand : isom
  minor_version : 512
  compatible_brands : isomiso2mp41
  encoder : Lavf53.21.1 Duration : 00:04:36.27, start : 0.000000, bitrate : 305 kb/s
  Stream #0:0(und) : Video : mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 303 kb/s, 20,85
  fps, 30 tbr, 1k tbn, 1k tbc
  Metadata :
  handler_name : VideoHandler

  which obviously I do not want to see. I cannot (do not want) to modify the libraries source codes, but rather modify my own so it can intercept this log and discard it.

  As far I tried to temporarly block the stdout/stderr streams through

  private static final devnull = new PrintStream(new OutputStream() {
  
          @Override
  
          public void write(int b) {
  
              //DO NOTHING
  
          }
  
          @Override
  
          public void write(byte[] b,int x,int y){
  
          }
  
     });
  
  
  
     /**
  
     * Blocks messages to stdout
  
     */
  
     public static void silentStdOut(){
  
       System.setOut(devnull);
  
     }
  
  
  
     /**
  
     * Blocks messages to stderr
  
     */
  
     public static void silentStdErr(){
  
       System.setErr(devnull);
  
     }

  but it does not seem to help, log message is still displayed

  public boolean add(String videofile) {
  
      Utils.silentStdErr();
  
      Utils.silentStdOut();
  
      FrameGrabber g = new OpenCVFrameGrabber( videofile );
  
      try{ 
  
          g.start();
  
      }
  
      ,,,

  "Raw" ffmpeg can be set to be less verbose using

  ffmpeg -loglevel panic

  but neither OpenCVFrameGrabber not FFmpegFrameGrabber give access to the tool's parameters.

  To sum up - how can I discard these log messages without modifing the libraries' source codes ?