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• How to compile BlackMagic SDK to FFMPEG

  22 août 2018, par Манаф Иракский

  In Mac OS 10.13 I have installed FFMPEG via
  brew install ffmpeg
  I have downloaded the latest BlackMagic SDK from BlackMagic websit.

  I am not sure how I can compile black magic SDK to my ffmpeg.

  Here is the update

  Manafs-MacBook-Pro:ffmpeg Manaf$ ./configure —prefix="$HOME/ffmpeg_build" —extra-cflags="-I$HOME/ffmpeg_build/include" —extra-ldflags="-L$HOME/ffmpeg_build/lib" —bindir="$HOME/bin" —enable-gpl —enable-nonfree —enable-libfdk_aac —enable-libfreetype —enable-libmp3lame —enable-libopus —enable-libvorbis —enable-libvpx —enable-libx264 —enable-libx265 —enable-decklink —extra-cflags=-I/Users/Manaf/Desktop/BM_SDK/Mac/include/ —extra-ldflags=-L/Users/Manaf/Desktop/BM_SDK/Mac/include/

  install prefix /Users/Manaf/ffmpeg_build

  source path .

  C compiler gcc

  C library

  ARCH x86 (generic)

  big-endian no

  runtime cpu detection yes

  standalone assembly yes

  x86 assembler nasm

  MMX enabled yes

  MMXEXT enabled yes

  3DNow ! enabled yes

  3DNow ! extended enabled yes

  SSE enabled yes

  SSSE3 enabled yes

  AESNI enabled yes

  AVX enabled yes

  AVX2 enabled yes

  AVX-512 enabled yes

  XOP enabled yes

  FMA3 enabled yes

  FMA4 enabled yes

  i686 features enabled yes

  CMOV is fast yes

  EBX available yes

  EBP available yes

  debug symbols yes

  strip symbols yes

  optimize for size no

  optimizations yes

  static yes

  shared no

  postprocessing support yes

  network support yes

  threading support pthreads

  safe bitstream reader yes

  texi2html enabled yes

  perl enabled yes

  pod2man enabled yes

  makeinfo enabled yes

  makeinfo supports HTML no

  External libraries : (lots of them I just removed them for this post)

  External libraries providing hardware acceleration :(here too)
  Libraries :(Here too)
  Programs:ffmpeg ffprobe

  Enabled decoders :(here too- so many)

  Enabled hwaccels :(here too)

  Enabled parsers :(here too)

  Enabled demuxers :(here too)

  Enabled muxers :(here too)

  Enabled protocols :(here too)

  Enabled filters :(here too)

  Enabled bsfs :(here too)

  Enabled indevs :

  avfoundation decklink lavfi

  Enabled outdevs :

  decklink

  License : nonfree and unredistributable

  libavutil/avconfig.h is unchanged

  libavcodec/parser_list.c is unchanged

  libavcodec/bsf_list.c is unchanged

  libavformat/demuxer_list.c is unchanged

  libavformat/muxer_list.c is unchanged

  libavdevice/indev_list.c is unchanged

  libavdevice/outdev_list.c is unchanged

  libavformat/protocol_list.c is unchanged

  Manafs-MacBook-Pro:ffmpeg Manaf$ ffmpeg -devices

  ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  built with Apple LLVM version 7.0.2 (clang-700.1.81)
  configuration : —prefix=/usr/local/Cellar/ffmpeg/3.4.2 —enable-shared —enable-pthreads —enable-version3 —enable-hardcoded-tables —enable-avresample —cc=clang —host-cflags= —host-ldflags= —disable-jack —enable-gpl —enable-libass —enable-libfdk-aac —enable-libfontconfig —enable-libfreetype —enable-libmp3lame —enable-libopus —enable-libvorbis —enable-libvpx —enable-libx264 —enable-libx265 —enable-libxvid —enable-opencl —enable-videotoolbox —disable-lzma —enable-nonfree

  libavutil 55. 78.100 / 55. 78.100

  libavcodec 57.107.100 / 57.107.100

  libavformat 57. 83.100 / 57. 83.100

  libavdevice 57. 10.100 / 57. 10.100

  libavfilter 6.107.100 / 6.107.100

  libavresample 3. 7. 0 / 3. 7. 0

  libswscale 4. 8.100 / 4. 8.100

  libswresample 2. 9.100 / 2. 9.100

  libpostproc 54. 7.100 / 54. 7.100

  Devices :

  D. = Demuxing supported

  .E = Muxing supported

  —

  D avfoundation AVFoundation input device

  D lavfi Libavfilter virtual input dev

  Thanks,

  ./ffmpeg -devices

  ffmpeg version N-90585-g46129b4044 Copyright (c) 2000-2018 the FFmpeg developers
  built with Apple LLVM version 7.0.2 (clang-700.1.81)
  configuration : —prefix=/Users/Manaf/ffmpeg_build —extra-cflags=-I/Users/Manaf/ffmpeg_build/include —extra-ldflags=-L/Users/Manaf/ffmpeg_build/lib —bindir=/Users/Manaf/bin —enable-gpl —enable-nonfree —enable-libfdk_aac —enable-libfreetype —enable-libmp3lame —enable-libopus —enable-libvorbis —enable-libvpx —enable-libx264 —enable-libx265 —enable-decklink —extra-cflags=-I/Users/Manaf/Desktop/BM_SDK/Mac/include/ —extra-ldflags=-L/Users/Manaf/Desktop/BM_SDK/Mac/include/

  libavutil 56. 12.100 / 56. 12.100

  libavcodec 58. 17.100 / 58. 17.100

  libavformat 58. 10.100 / 58. 10.100

  libavdevice 58. 2.100 / 58. 2.100

  libavfilter 7. 14.100 / 7. 14.100

  libswscale 5. 0.102 / 5. 0.102

  libswresample 3. 0.101 / 3. 0.101

  libpostproc 55. 0.100 / 55. 0.100

  Devices :

  D. = Demuxing supported

  .E = Muxing supported

  —

  D avfoundation AVFoundation input device

  DE decklink Blackmagic DeckLink output

  D lavfi Libavfilter virtual input device

• Changing bit-rate with timestamp copy still offsets events by 1 or 2 frames

  10 avril 2018, par harkmug

  As a novice user, I am trying to understand the following. I have an mp4 (encoder=Lavf57.66.104) that is 127 MB in size and I use the following to reduce its size :

  ffmpeg -i original.mp4 -start_at_zero -copyts -b:v 1000k -c:a copy output.mp4

  The duration and number of frames stay the same after this process, however, when I annotate (using ELAN) the same events (at millisecond level, e.g. a blink) the output video (encoder=Lavf57.55.100) seems to be offset relative to the original by 1 or 2 frames.

  Can someone help me understand this shift ? Thanks !

  UPDATE (2018-04-10) :
  As per @Mulvya’s suggestion, ran :

  ffmpeg -i original.mp4 -copyts -b:v 1000k -c:a copy output.mp4

  Looking at the two files :

  fprobe -v error -select_streams v:0 -show_frames -show_entries frame=key_frame,pkt_pts_time,pict_type,coded_picture_number -of default=noprint_wrappers=1:nokey=1 -of csv=p=0 original.mp4 | head -n 5
  
  
  
  1,5292.861000,I,0
  
  0,5292.894333,P,1
  
  0,5292.927667,P,2
  
  0,5292.961000,P,3
  
  0,5292.994333,P,4

  Same for output :

  1,5292.866016,I,0
  
  0,5292.899349,P,1
  
  0,5292.932682,P,2
  
  0,5292.966016,P,3
  
  0,5292.999349,P,4

  Trying to understand how to get the same time-stamps for the same frames. Maybe this is not possible ?

• FFMpeg mixing audio to video creates silent video after audio is added,

  25 mars 2018, par 1234567

  mixing audio to video creates silent video after audio is added, using FFMpeg

  this is the command I am using

  "-y","-i",j,"-filter_complex","amovie="+audio+":loop=999,asetpts=N/SR/TB,atrim=0:18,adelay=50000|50000,aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=1.5[a1];[0:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=2.0[a2];[a1][a2]amerge,pan=stereo:c0code>

  I have a video which is 2 mins 7 seconds ling, I want to ’mix’ audio to a part starting from 50 seconds to 68 seconds

  What i want is to keep original sound from video and mix audio to existing sound of video(not over write) it, (keep old video sound and new audio in video)

  what happens is till 50 seconds video has its own sound, from 50 -68 the audio over writes the video sound and from then till end it is silent

  what i want is video to have its sound through out the video and mix from 50 -68 seconds the audio to it

  this graphic can explain a bit of what i want and what i am getting

  What i want
  what i am getting
  another problem that I am facing is
  if i try this on a silent video (video with no sound at all) this code fails this is the error that I am getting

  ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8 (GCC)
  
    configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
    libavutil      55. 17.103 / 55. 17.103
  
    libavcodec     57. 24.102 / 57. 24.102
  
    libavformat    57. 25.100 / 57. 25.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 31.100 /  6. 31.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/sdcard0/abcd/Videos/20180325_164206.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2018-03-25 16:44:15
  
    Duration: 00:02:05.21, start: 0.000000, bitrate: 1585 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x1280, 1584 kb/s, SAR 1:1 DAR 9:16, 11.83 fps, 90k tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        creation_time   : 2018-03-25 16:44:15
  
        handler_name    : VideoHandle
  
  [mp3 @ 0xaca26b40] Skipping 0 bytes of junk at 417.
  
  [Parsed_pan_9 @ 0xac9b17e0] This syntax is deprecated. Use '|' to separate the list items.
  
  Stream specifier ':a' in filtergraph description amovie=/storage/sdcard0/abcd/Videos/baby.mp3:loop=999,asetpts=N/SR/TB,atrim=0:18,adelay=50000|50000,aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=1.5[a1];[0:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume=2.0[a2]; [a1][a2]amerge,pan=stereo:c0code>

  how can we add audio to a silent video