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• stream & play incompleted mpeg-4 file

  6 mai 2017, par maytide

  I’m using MediaRecorder to record screen on android device, the output file format is mpeg-4 and without a "moov atom" in front.

  Now I want to stream this mpeg-4 file to remote server in real-time and make it playable, how can i achieve this ?

  Any suggestions will be greatly appreciated.

• ffmpeg not setting GOP size for x264

  5 juillet 2012, par Chris Robinson

  Can someone please explain to me why the following settings :

  ffmpeg -i test.avi -vcodec libx264 -g 2 -keyint_min 1 -sc_threshold 100000000 -bf 1 test.mp4

  produces the following output :

  ffmpeg version N-41668-g564bb24 Copyright (c) 2000-2012 the FFmpeg developers
  
  built on Jun 17 2012 20:18:05 with gcc 4.6.3
  
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libass --enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --ena  libavutil      51. 58.100 / 51. 58.100
  
    libavcodec     54. 25.100 / 54. 25.100
  
    libavformat    54.  6.101 / 54.  6.101
  
    libavdevice    54.  0.100 / 54.  0.100
  
    libavfilter     2. 81.100 /  2. 81.100
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0. 15.100 /  0. 15.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  Input #0, avi, from 'test.avi':
  
    Metadata:
  
      encoder         : Lavf54.6.101
  
    Duration: 00:00:01.70, start: 0.000000, bitrate: 4258 kb/s
  
  Stream #0:0: Video: mpeg4 (Simple Profile) (DIVX / 0x58564944), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 29.97 tbn, 30k tbc
  
  Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16, 128 kb/s
  
  [buffer @ 0000000004115600] w:1280 h:720 pixfmt:yuv420p tb:1001/30000 fr:30000/1001 sar:1/1 sws_param:flags=2
  
  [ffmpeg_buffersink @ 00000000041157a0] No opaque field provided
  
  [libx264 @ 000000000411f120] using SAR=1/1
  
  [libx264 @ 000000000411f120] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
  
  [libx264 @ 000000000411f120] profile High, level 3.1
  
  [libx264 @ 000000000411f120] 264 - core 125 r2200 999b753 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - 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=36 lookahead_threads=6 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 keOutput #0, mp4, to 'test.mp4':
  
    Metadata:
  
      encoder         : Lavf54.6.101
  
      Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 30k tbn, 29.97 tbc
  
      Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, s16, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg4 -> libx264)
  
    Stream #0:1 -> #0:1 (mp3 -> libvo_aacenc)
  
  Press [q] to stop, [?] for help
  
  [libvo_aacenc @ 0000000001ebe240] Que input is backward in time
  
  Last message repeated 8 times
  
  frame=   35 fps=0.0 q=-1.0 Lsize=     466kB time=00:00:01.10 bitrate=3466.6kbits/s dup=1 drop=0    
  
  
  
  video:436kB audio:28kB global headers:0kB muxing overhead 0.558509%
  
  [libx264 @ 000000000411f120] frame I:1     Avg QP:24.93  size: 92398
  
  [libx264 @ 000000000411f120] frame P:28    Avg QP:26.82  size: 12010
  
  [libx264 @ 000000000411f120] frame B:6     Avg QP:30.37  size:  2764
  
  [libx264 @ 000000000411f120] consecutive B-frames: 74.3%  5.7%  8.6% 11.4%
  
  [libx264 @ 000000000411f120] mb I  I16..4: 41.5% 40.1% 18.4%
  
  [libx264 @ 000000000411f120] mb P  I16..4:  3.9%  1.4%  0.6%  P16..4: 14.3%  4.7%  3.2%  0.0%  0.0%    skip:72.0%
  
  [libx264 @ 000000000411f120] mb B  I16..4:  1.1%  0.4%  0.1%  B16..8: 14.2%  2.8%  0.6%  direct: 1.1%  skip:79.8%  L0:49.8% L1:39.5% BI:10.8%
  
  [libx264 @ 000000000411f120] 8x8 transform intra:29.9% inter:76.4%
  
  [libx264 @ 000000000411f120] coded y,uvDC,uvAC intra: 31.1% 34.4% 18.7% inter: 10.2% 6.3% 3.0%
  
  [libx264 @ 000000000411f120] i16 v,h,dc,p: 62% 34%  3%  0%
  
  [libx264 @ 000000000411f120] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 23% 38%  4%  4%  3%  3%  2%  5%
  
  [libx264 @ 000000000411f120] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 40% 35% 16%  1%  2%  2%  1%  1%  1%
  
  [libx264 @ 000000000411f120] i8c dc,h,v,p: 52% 20% 24%  3%
  
  [libx264 @ 000000000411f120] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 000000000411f120] ref P L0: 70.5% 10.1% 12.1%  7.3%
  
  [libx264 @ 000000000411f120] ref B L0: 81.1% 16.9%  2.0%
  
  [libx264 @ 000000000411f120] ref B L1: 89.7% 10.3%
  
  [libx264 @ 000000000411f120] kb/s:3050.18

  Why am I not getting an I-Frame every second frame ? Is there something else I can set to do enforce this ? If not, can you suggest how to do this using the mpeg4 codec. It's vital that I can extract what type of frame has been encoded during the encoding process and that I can set a specific GOP structure.

• ffmpeg compose multiple files [on hold]

  28 avril 2017, par Seba

  We are looking for an ffmpeg development to compose multiple matroska files to a single mpeg4 file.
  Bellow are the requirements definition for this composer :

  • Technology :
    FFmpeg Fast Video Processing.
    AWS to iOS and Android Streaming.

  • Input :
    Webm Video and Audio Individual files.

  • Output :
    MPEG4 Video and Audio Single file.

  • Resizable :
    Mobile Phone Display Size.

  • Background
    Vertical Video.
    0 (Transparent) to 1 Video.

  • Front :
    Circular Videos.
    0 to 9 Videos.

  • Layout : image

  Any help would be appreciated