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• avcodec/sanm : codec37 : reimplement comp4

  11 mars, par Manuel Lauss

  avcodec/sanm : codec37 : reimplement comp4
  Compression 4 code 0 means copy from delta buffer without mv,
  
  AND start of a skip run.  This gets rid of the extra case and column
  
  index manipulation and implements this as it is implemented in the
  
  original game exe, i.e. as a special case for after mv copy.
  Signed-off-by : Manuel Lauss <manuel.lauss@gmail.com>
  

  • [DH] libavcodec/sanm.c

• FFmpeg compose, multi layers and filters

  10 octobre 2019, par jadeshohy

  Pretty new to FFmpeg. We would like to use FFmpeg as a important part of an AR project.

  Currently, we find it is not easy for us.

  We want to compose the footages with FFmpeg.

  We got 5 layers, wanted to blend them with specific mode, like the things in After Effects.

  • layer-1/ [A.webm] video，vp9 codec, which has a transparent BG,has to be added as [normal mode]

  • layer-2/ [B.mp4] video, optical-flare things with black BG,has to be added as [screen mode]

  • layer-3/ [C.mp4] video, some motion graphic things with light BG,has to be added as [overlay mode]

  • layer-4/ [BG.MP4], backgound things, has to be added as [normal mode]

  After we blend those 4 (like pre-compose,use blend filter), we want to add another layer-5/[icon.png] which is the special icon.

  Layer-5 need to overlay the pre-compose. We have to overlay it at the special position (use overlay filter ?).

  Cause [icon.png] may change frequently. we want to deal with that after the 4 layer blending.

  But at the first step, when we set normal mode for layer-1 in blend filter, layer-1 [A.webm] lost the transparent BG，it gave us a black BG which block all other things.
  Blend filter can not handle the alpha channel of vp9 webm ?
  When we set the mode of layer-1 to screen mode,the translucent thing was not what we need.

  Could you please give us some commands to achieve the blend above ?

  The commands that really work will be extremely useful for our FFmpeg initiation.

  ffmpeg -c:v libvpx-vp9 -i transparent.webm -i bg.mp4 -filter_complex "[0:v]format=yuva420p [a]; [1:v]format=yuv420p [b]; [a][b]blend=all_mode='normal':shortest=1:all_opacity=1,format=yuv420p" output.mp4 >log
  
  ffmpeg version 4.1.4 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.4_1 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  [libvpx-vp9 @ 0x7f8876008600] v1.8.0
  
      Last message repeated 1 times
  
  Input #0, matroska,webm, from 'transparent.webm':
  
    Metadata:
  
      encoder         : Chrome
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0(eng): Video: vp9 (Profile 0), yuva420p(tv), 640x360, SAR 1:1 DAR 16:9, 60 fps, 60 tbr, 1k tbn, 1k tbc (default)
  
      Metadata:
  
        alpha_mode      : 1
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'bg.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.83.100
  
    Duration: 00:00:04.00, start: 0.000000, bitrate: 728 kb/s
  
      Stream #1:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x360, 725 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  [libvpx-vp9 @ 0x7f8877806600] v1.8.0
  
  Stream mapping:
  
    Stream #0:0 (libvpx-vp9) -> format
  
    Stream #1:0 (h264) -> format
  
    format -> Stream #0:0 (libx264)
  
  Press [q] to stop, [?] for help
  
  [libvpx-vp9 @ 0x7f8877806600] v1.8.0
  
  [libx264 @ 0x7f8877817200] using SAR=1/1
  
  [libx264 @ 0x7f8877817200] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 0x7f8877817200] profile High, level 3.1
  
  [libx264 @ 0x7f8877817200] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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
  
  Output #0, mp4, to 'output.mp4':
  
    Metadata:
  
      encoder         : Lavf58.20.100
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 60 fps, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        encoder         : Lavc58.35.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  frame=  239 fps=113 q=-1.0 Lsize=     232kB time=00:00:03.93 bitrate= 482.5kbits/s dup=1 drop=2 speed=1.86x
  
  video:228kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.586669%
  
  [libx264 @ 0x7f8877817200] frame I:1     Avg QP:20.55  size:  5385
  
  [libx264 @ 0x7f8877817200] frame P:62    Avg QP:24.42  size:  2373
  
  [libx264 @ 0x7f8877817200] frame B:176   Avg QP:31.31  size:   456
  
  [libx264 @ 0x7f8877817200] consecutive B-frames:  1.3%  0.8%  2.5% 95.4%
  
  [libx264 @ 0x7f8877817200] mb I  I16..4: 18.6% 68.4% 13.0%
  
  [libx264 @ 0x7f8877817200] mb P  I16..4:  1.6%  4.0%  0.7%  P16..4: 14.8%  7.0%  4.5%  0.0%  0.0%    skip:67.5%
  
  [libx264 @ 0x7f8877817200] mb B  I16..4:  0.2%  0.0%  0.0%  B16..8: 17.4%  2.5%  0.4%  direct: 0.5%  skip:78.9%  L0:53.1% L1:40.4% BI: 6.6%
  
  [libx264 @ 0x7f8877817200] 8x8 transform intra:60.1% inter:60.4%
  
  [libx264 @ 0x7f8877817200] coded y,uvDC,uvAC intra: 16.6% 27.4% 10.7% inter: 3.0% 2.2% 0.1%
  
  [libx264 @ 0x7f8877817200] i16 v,h,dc,p: 56% 37%  6%  2%
  
  [libx264 @ 0x7f8877817200] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 40%  6% 48%  1%  1%  1%  1%  1%  1%
  
  [libx264 @ 0x7f8877817200] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 35% 22% 23%  3%  3%  4%  3%  4%  3%
  
  [libx264 @ 0x7f8877817200] i8c dc,h,v,p: 57% 20% 21%  2%
  
  [libx264 @ 0x7f8877817200] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x7f8877817200] ref P L0: 69.3% 12.8% 13.6%  4.3%
  
  [libx264 @ 0x7f8877817200] ref B L0: 92.9%  5.9%  1.1%
  
  [libx264 @ 0x7f8877817200] ref B L1: 96.1%  3.9%
  
  [libx264 @ 0x7f8877817200] kb/s:467.59

• Why is the ffmpeg command have a variable bit rate

  5 juin 2013, par Trace

  I have this command

  ffmpeg -i test.mp3 -ac 1 -ab 64000 -ar 44100 output.mp3

  The requirements are

  mp3 (mpeg-1 layer 3) 
  
  Bit rate: 64kbps CBR(constant Bit Rate) 
  
  Sampling rate: 44.1 
  
  Bit depth: 16bit 
  
  Channels: mono

  The sample rate is correct, but file came through with a variable bit rate, not constant bit rate

  Any ideas what im missing here