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• How to configure FFMPEG to generate position independent code on IOS

  8 juillet 2013, par madadi

  I am developing an app on iOS which makes use of FFMPEG for video decoding. I want to get 'position independent code' of FFMPEG working on my app. --enable-pic option in the FFMPEG configuration generates position independent code only if I set --disable-asm. I concluded this when I ran the otool on my app(otool -hv 'appname'). Below are the details :

  If I set --enable-pic alone, below is the output with otool :

  magic     cputype  cpusubtype  caps  filetype  ncmds  sizeofcmds  flags
  
  MH_MAGIC  ARM      V7          0x00  EXECUTE   29     3724        NOUNDEFS DYLDLINK TWOLEVEL WEAK_DEFINES BINDS_TO_WEAK

  If I set --enable-pic and --disable-asm below is the output with otool,

  magic     cputype  cpusubtype  caps  filetype  ncmds  sizeofcmds  flags
  
  MH_MAGIC  ARM      V7          0x00  EXECUTE   51     5520        NOUNDEFS DYLDLINK TWOLEVEL WEAK_DEFINES BINDS_TO_WEAK **PIE** 

  Below are my configuration settings for FFMPEG(build-ffmpeg-ios.sh) :

  if [  `uname` =  "Darwin" ]; then
  
    SEDCMD="sed -i '' "
  
  else
  
    SEDCMD="sed -i "
  
  fi
  
  
  
  
  
  make clean
  
  ./configure \
  
      --prefix=$PREFIX \
  
      --enable-version3 \
  
      --enable-static \
  
      --disable-shared \
  
      --disable-doc \
  
      --disable-ffmpeg \
  
      --disable-ffplay \
  
      --disable-ffprobe \
  
      --disable-ffserver \
  
      --disable-avdevice \
  
      --disable-avfilter \
  
      --disable-postproc \
  
      --enable-small \
  
      --cross-prefix="$DEVROOT/usr/bin/" \
  
      --enable-cross-compile \
  
      --target-os=darwin \
  
      --arch=$ARCH \
  
      --cpu=$CPU \
  
      --cc="$CC" \
  
      --as="$AS" \
  
      --extra-cflags="$CFLAGS" \
  
      --extra-ldflags="$CFLAGS" \
  
      --disable-symver \
  
      --disable-debug \
  
      --disable-indevs \
  
      --disable-encoders \
  
      --disable-bsfs \
  
      --enable-pic \
  
      --disable-filters \
  
      $CONFIGURE_FLAGS || exit 1;
  
  $SEDCMD 's/HAVE_INLINE_ASM 1/HAVE_INLINE_ASM 0/g' config.h
  
  make install || exit 1;

  And below is the make file I use(iOS.mk) :

  FFMPEG_LIBS := libavcodec.a libavformat.a libavutil.a libswscale.a
  
  
  
  IOS_ARMV7_FFMPEG_LIB := $(addprefix build/ios/armv7/lib/, $(FFMPEG_LIBS))
  
  
  
  IOS_UNI_FFMPEG_LIB := $(addprefix build/ios/universal/lib/, $(FFMPEG_LIBS))
  
  
  
  
  
  
  
  IPHONE_SDK_VERSION := "5.0"
  
  IPHONE_DEPLOY_SDK := "3.2"
  
  
  
  ALL_IOS_LIBS := $(IOS_UNI_FFMPEG_LIB) 
  
  
  
  build/ios/universal/lib/%.a : build/ios/armv7/lib/%.a
  
      mkdir -p build/ios/universal/lib
  
      lipo -create -output $@ $^
  
  
  
  
  
  
  
  $(IOS_ARMV7_FFMPEG_LIB): 
  
      export PREFIX="`$(ABSPATH) build/ios/armv7`" && \
  
      export ARCH="arm" && \
  
      export CPU="cortex-a8" && \
  
      export IOS_BASE_SDK="$(IPHONE_SDK_VERSION)" && \
  
      export IOS_DEPLOY_TGT="$(IPHONE_DEPLOY_SDK)" && \
  
      export CONFIGURE_FLAGS="--enable-neon" && \
  
      export PATH="`$(ABSPATH) venders`:$$PATH" && \
  
      cd venders/ffmpeg && bash ../iphone-compile.sh arm7 ../build-ffmpeg-ios.sh

  Can someone please help me with getting the FFMPEG up and running with both 'pic' and assembly optimization enabled. Without assembly optimizastion, FFMPEG would not be helpful to me as the video decoding is extremely slow.

• Transcode each stream in a different thread with ffmpeg

  30 mai 2018, par hedgar2017

  Is there a way of forcing ffmpeg to encode each audio stream in a different thread ?

  ffmpeg
  
      -i audio1.ac3 -c:a libopus
  
      -i audio2.ac3 -c:a libopus
  
      -i audio3.ac3 -c:a libopus
  
      output.mkv

  I mean only ffmpeg’s own instruments, without multiple processes and other OS features.

  Normally, there is only one core saturated, so encoding a file with many audio streams is very long.

  Exact command :

  ffmpeg -loglevel verbose
  
      -i 'Ярость (Fury).mkv'
  
      -i 'Fury (2014) [Ukr & Eng, Sub Eng] BDRip-AVC [Hurtom & HELLYWOOD].mkv'
  
      -threads 0 -max_muxing_queue_size 65536 -avoid_negative_ts 1 -metadata title=2014.Fury.BDRip.HEVC.1080p
  
      -map 0:0 -c:v copy -metadata:s:v:0 title=2014.Fury.BDRip.HEVC.1080p -disposition:v:0 +defaug-[forced
  
      -map 0:2 -c:a libopus -application audio -vbr on -packet_loss 0 -frame_duration 20 -mapping_family 255 -compression_level 10 -metadata:s:a:0 language=eng -metadata:s:a:0 title=Original -disposition:a:0 +defaug-[forced
  
      -map 1:1 -c:a libopus -application audio -vbr on -packet_loss 0 -frame_duration 20 -mapping_family 255 -compression_level 10 -metadata:s:a:1 language=ukr -disposition:a:1 -default-forced
  
      -map 0:1 -c:a libopus -application audio -vbr on -packet_loss 0 -frame_duration 20 -mapping_family 255 -compression_level 10 -metadata:s:a:2 language=rus -metadata:s:a:2 title=Dub -disposition:a:2 -default-forced
  
      -map 0:10 -c:s copy -metadata:s:s:0 language=eng -metadata:s:s:0 title=Original -disposition:s:0 -default-forced
  
      -f matroska ./2014.Fury.BDRip.HEVC.1080p.mkv

  Log :

  ... inputs ...
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:2 -> #0:1 (dts (dca) -> opus (libopus))
  
    Stream #1:1 -> #0:2 (ac3 (native) -> opus (libopus))
  
    Stream #0:1 -> #0:3 (ac3 (native) -> opus (libopus))
  
    Stream #0:10 -> #0:4 (copy)
  
  Press [q] to stop, [?] for help
  
  [graph_2_in_0_1 @ 0000019ca2cb29c0] tb:1/48000 samplefmt:fltp samplerate:48000 chlayout:0x60f
  
  [format_out_0_3 @ 0000019ca2cb20c0] auto-inserting filter 'auto_resampler_0' between the filter 'Parsed_anull_0' and the filter 'format_out_0_3'
  
  [auto_resampler_0 @ 0000019ca2cb27c0] ch:6 chl:5.1(side) fmt:fltp r:48000Hz -> ch:6 chl:5.1(side) fmt:flt r:48000Hz
  
  [libopus @ 0000019ca2c9f3c0] No bit rate set. Defaulting to 384000 bps.
  
  [graph_0_in_0_2 @ 0000019ca2cb1ac0] tb:1/48000 samplefmt:fltp samplerate:48000 chlayout:0x60f
  
  [format_out_0_1 @ 0000019ca2cb1bc0] auto-inserting filter 'auto_resampler_0' between the filter 'Parsed_anull_0' and the filter 'format_out_0_1'
  
  [auto_resampler_0 @ 0000019ca2cb14c0] ch:6 chl:5.1(side) fmt:fltp r:48000Hz -> ch:6 chl:5.1(side) fmt:flt r:48000Hz
  
  [libopus @ 0000019ca292c980] No bit rate set. Defaulting to 384000 bps.
  
  [graph_1_in_1_1 @ 0000019ca2cb2bc0] tb:1/48000 samplefmt:fltp samplerate:48000 chlayout:0x60f
  
  [format_out_0_2 @ 0000019ca2cb26c0] auto-inserting filter 'auto_resampler_0' between the filter 'Parsed_anull_0' and the filter 'format_out_0_2'
  
  [auto_resampler_0 @ 0000019ca2cb0dc0] ch:6 chl:5.1(side) fmt:fltp r:48000Hz -> ch:6 chl:5.1(side) fmt:flt r:48000Hz
  
  [libopus @ 0000019ca292e980] No bit rate set. Defaulting to 384000 bps.
  
  Output #0, matroska, to './2014.Fury.BDRip.HEVC.1080p.mkv':
  
    Metadata:
  
      DATE_RELEASED   : 2014
  
      title           : 2014.Fury.BDRip.HEVC.1080p
  
      Released by     : Buba5473 for NNM-Club
  
      Copyright       : Encoded by Goor80
  
      encoder         : Lavf58.12.100
  
      Chapter #0:0: start 0.000000, end 478.228000
  
      Metadata:
  
        title           : Chapter 01
  
      ... chapters ...
  
      Stream #0:0: Video: hevc (Main 10), 1 reference frame, yuv420p10le(tv), 1920x800 (0x0) [SAR 1:1 DAR 12:5], q=2-31, 23.98 fps, 23.98 tbr, 1k tbn, 1k tbc (default)
  
      Stream #0:1(eng): Audio: opus (libopus) ([255][255][255][255] / 0xFFFFFFFF), 48000 Hz, 5.1(side), flt, delay 312, 384 kb/s (default)
  
      Stream #0:2(ukr): Audio: opus (libopus) ([255][255][255][255] / 0xFFFFFFFF), 48000 Hz, 5.1(side), flt, delay 312, 384 kb/s
  
      Stream #0:3(rus): Audio: opus (libopus) ([255][255][255][255] / 0xFFFFFFFF), 48000 Hz, 5.1(side), flt, delay 312, 384 kb/s
  
      Stream #0:4(eng): Subtitle: subrip
  
  [matroska @ 0000019ca2d17f00] Starting new cluster due to timestamp=6175.5kbits/s speed=10.2x
  
  [matroska @ 0000019ca2d17f00] Starting new cluster due to timestamp=7530.8kbits/s speed=8.74x
  
  [matroska @ 0000019ca2d17f00] Starting new cluster due to timestamp=7955.1kbits/s speed=9.02x
  
  frame=156607 fps=205 q=-1.0 size= 8321971kB time=01:48:51.85 bitrate=10437.1kbits/s speed=8.55x
  
  ... not finished yet ...

  fps is always around 3000/number_of_audio_channels, meaning all audio transcoding is done with the only thread.

• ffmpeg was not found on your system in Azure service fabric application

  17 novembre 2023, par dotnet developer

  I have a stateless service fabric application, which uses ffmpeg.exe to convert video files. ffmpeg.exe is added to the project and it's properties set to Content & Copy always. When I install the app on Azure VM (Service Fabric 5 node cluster), it has been deployed to D :\SvcFab_App\Sample_App1\Sample.Code.1.0.0. (D drive is temp storage on Azure VM). When ever I try to convert a video file, I am getting ffmpeg.exe was not found on your system exception. I am able to convert files in development environment and on on-prem server without any exception.

  


  I tried to access ffmpeg.exe using Path.Combine(Directory.GetCurrentDirectory(), “ffmpeg.exe”) and Path.Combine(FabricRuntime.GetActivationContext().GetCodePackageObject(“Code”).Path, “ffmpeg.exe”)