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• Timestamp discontinuity issue in HTTP Live Streaming

  25 décembre 2014, par user3663917

  I was trying to do HTTP Live streaming. The segmentation of the files were done using FFMPEG. The segments are of 5 seconds each. In my case every one minute the PCR values of the input "ts" is reset, ie in the segmented files the segments created after every one minute is having a different range of pcr compared to the previous segments(discontinuity in pcr). These segments work fine in apple devices but in android devices the stream gets stuck after one minute. Is there some method to overcome this issue either in the server side or in the android side ?

• ffmpeg options for playing in iPad WebView with tag

  19 septembre 2013, par Waynn Lue

  I'm trying to convert a video to be played in a tag in a WebView in iOS. I've tried the options at this link but it still doesn't seem to play. I've found videos that do successfully play, though, so I'm sure it's possible, I just can't seem to get any working. Here's the ffmpeg -i output for something that works.

  Here's what I tried from the wiki :

  ffmpeg -i {filename} -acodec aac -ac 2 -strict experimental -ab 160k -vcodec libx264 -preset slow -profile:v baseline -level 30 -maxrate 10000000 -bufsize 10000000 -b 1200k -f mp4 -threads 0 {filename}.ipad.mp4

  But the file doesn't play in the WebView.

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.m4v' :
    Metadata :
      major_brand : M4V 
      minor_version : 1
      compatible_brands : M4V M4A mp42isom
      creation_time : 2005-12-20 20:20:15
    Duration : 00:01:25.50, start : 0.000000, bitrate : 209 kb/s
      Stream #0:0(eng) : Audio : aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 115 kb/s
      Metadata :
        creation_time : 2005-12-20 20:20:15
        handler_name : Apple Sound Media Handler
      Stream #0:1(eng) : Video : h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 320x240, 90 kb/s, 10 fps, 10 tbr, 1k tbn, 2k tbc
      Metadata :
        creation_time : 2005-12-20 20:20:15
        handler_name : Apple Video Media Handler
  

  And here's the output for my input file :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'cheerfulness.mov' :
    Metadata :
      major_brand : qt  
      minor_version : 537199360
      compatible_brands : qt  
      creation_time : 2013-07-31 00:47:22
    Duration : 00:00:06.00, start : 0.000000, bitrate : 120849 kb/s
      Stream #0:0(eng) : Video : h264 (Main) (avc1 / 0x31637661), yuv420p, 1200x1920, 120823 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 60k tbc
      Metadata :
        creation_time : 2013-07-31 00:48:33
        handler_name : Apple Alias Data Handler
  

  edit : Here's the full output of the command :

  wlue :$ ffmpeg -i cheerfulness.mov -acodec aac -ac 2 -strict experimental -ab 160k -vcodec libx264 -preset slow -profile:v baseline -level 30 -maxrate 10000000 -bufsize 10000000 -b 1200k -f mp4 -threads 0 output.ipad.mp4
  ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
    built on Sep 18 2013 18:44:15 with Apple LLVM version 4.2 (clang-425.0.28) (based on LLVM 3.2svn)
    configuration : —prefix=/usr/local/Cellar/ffmpeg/1.2.1 —enable-shared —enable-pthreads —enable-gpl —enable-version3 —enable-nonfree —enable-hardcoded-tables —enable-avresample —enable-vda —cc=cc —host-cflags= —host-ldflags= —enable-libx264 —enable-libfaac —enable-libmp3lame —enable-libxvid
    libavutil      52. 18.100 / 52. 18.100
    libavcodec     54. 92.100 / 54. 92.100
    libavformat    54. 63.104 / 54. 63.104
    libavdevice    54.  3.103 / 54.  3.103
    libavfilter     3. 42.103 /  3. 42.103
    libswscale      2.  2.100 /  2.  2.100
    libswresample   0. 17.102 /  0. 17.102
    libpostproc    52.  2.100 / 52.  2.100
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'cheerfulness.mov' :
    Metadata :
      major_brand : qt  
      minor_version : 537199360
      compatible_brands : qt  
      creation_time : 2013-07-31 00:47:22
    Duration : 00:00:06.01, start : 0.000000, bitrate : 120849 kb/s
      Stream #0:0(eng) : Video : h264 (Main) (avc1 / 0x31637661), yuv420p, 1200x1920, 120823 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 60k tbc
      Metadata :
        creation_time : 2013-07-31 00:48:33
        handler_name : Apple Alias Data Handler
  Please use -b:a or -b:v, -b is ambiguous
  [libx264 @ 0x7fa67401fa00] frame MB size (75x120) > level limit (1620)
  [libx264 @ 0x7fa67401fa00] DPB size (5 frames, 17280000 bytes) > level limit (0 frames, 3110400 bytes)
  [libx264 @ 0x7fa67401fa00] MB rate (269730) > level limit (40500)
  [libx264 @ 0x7fa67401fa00] using cpu capabilities : MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX
  [libx264 @ 0x7fa67401fa00] profile Constrained Baseline, level 3.0
  [libx264 @ 0x7fa67401fa00] 264 - core 125 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options : cabac=0 ref=5 deblock=1:0:0 analyse=0x1:0x111 me=umh subme=8 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=abr mbtree=1 bitrate=1200 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=10000 vbv_bufsize=10000 nal_hrd=none ip_ratio=1.40 aq=1:1.00
  Output #0, mp4, to 'output.ipad.mp4' :
    Metadata :
      major_brand : qt  
      minor_version : 537199360
      compatible_brands : qt  
      encoder : Lavf54.63.104
      Stream #0:0(eng) : Video : h264 ([33][0][0][0] / 0x0021), yuv420p, 1200x1920, q=-1—1, 1200 kb/s, 30k tbn, 29.97 tbc
      Metadata :
        creation_time : 2013-07-31 00:48:33
        handler_name : Apple Alias Data Handler
  Stream mapping :
    Stream #0:0 -> #0:0 (h264 -> libx264)
  Press [q] to stop, [?] for help
  frame=  180 fps= 16 q=-1.0 Lsize=     828kB time=00:00:06.00 bitrate=1129.2kbits/s    
  video:826kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.177851%
  [libx264 @ 0x7fa67401fa00] frame I:2     Avg QP:32.23  size : 20942
  [libx264 @ 0x7fa67401fa00] frame P:178   Avg QP:41.03  size :  4515
  [libx264 @ 0x7fa67401fa00] mb I  I16..4 : 90.1%  0.0%  9.9%
  [libx264 @ 0x7fa67401fa00] mb P  I16..4 :  6.8%  0.0%  0.0%  P16..4 : 16.8%  0.6%  0.2%  0.0%  0.0%    skip:75.5%
  [libx264 @ 0x7fa67401fa00] final ratefactor : 37.56
  [libx264 @ 0x7fa67401fa00] coded y,uvDC,uvAC intra : 1.2% 16.4% 2.1% inter : 0.1% 3.4% 0.1%
  [libx264 @ 0x7fa67401fa00] i16 v,h,dc,p : 49% 23%  4% 24%
  [libx264 @ 0x7fa67401fa00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu : 13%  8% 36%  8% 12%  9%  8%  4%  2%
  [libx264 @ 0x7fa67401fa00] i8c dc,h,v,p : 88%  6%  5%  1%
  [libx264 @ 0x7fa67401fa00] ref P L0 : 47.7% 22.0% 16.7%  5.7%  7.9%
  [libx264 @ 0x7fa67401fa00] kb/s:1126.21
  

• trying to build a audio video format convertion tool help required

  19 février 2012, par moon

  hello i am going to build a windows desktop tool that can convert the audio and video formats of all types.

  i am in technology selection phase.

  thinking about java and ffmpeg for this purpose but i come to know there are some formats that ffmpeg can not convert for them what should i do ?

  second is there ffmpge api for java to use intead of using it through process builder ?

  and at last is there any other approach that is more easy and stable from described above ?

  AVI, MPG, MPEG, VOB, WMV, MP4, M4V,

  ASF, MOV, QT, 3GP, DAT, OGM, DVR-MS, FLV, MKV, RM, RMVB, VRO, TS, AMV,
  F4V, MTS, MT2S, WAV, MP3, WMA, OGG, APE,

  M4A, MPC, WV, AMR, AC3, AU to AVI, MPEG, MOV, WMV, MP4, RM, iPod,
  iPad, HTC, PSP, iPhone, Zune, BlackBerry, Apple

  TV, PS3, Xbox360, Creative ZEN, Archos, iRiver, 3GP, FLV, SWF, WAV,
  MP3, WMA, M4A, AMR, AAC, AIFF and AC3

  help required

  regards.