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• EC2 for video-encoding

  24 septembre 2012, par TK Kocheran

  I have a potential job which will require me to do some video encoding with FFMPEG and x264. I'll have a series of files which I'll need to encode once, then I'll be able to bring down the instances. Since I'm not really sure of the resource utilization of x264 and FFMPEG, what kind of instances should I get ? I'm thinking either a

  High-CPU Extra Large Instance

  7 GB of memory
  20 EC2 Compute Units (8 virtual cores with 2.5 EC2 Compute Units each)
  1690 GB of instance storage
  64-bit platform
  I/O Performance : High
  API name : c1.xlarge

  or, alternatively a

  Cluster GPU Quadruple Extra Large Instance

  22 GB of memory
  33.5 EC2 Compute Units (2 x Intel Xeon X5570, quad-core “Nehalem” architecture)
  2 x NVIDIA Tesla “Fermi” M2050 GPUs
  1690 GB of instance storage
  64-bit platform
  I/O Performance : Very High (10 Gigabit Ethernet)
  API name : cg1.4xlarge

  What should I use ? Does x264/FFMPEG perform better with faster/more CPUs or does it really pound the GPU more ? In any case, it seems that the Cluster GPU seems to be the higher performance instance. What should I prefer ?

• Using ffmpeg to play file on windows, should use directshow to render the decoded frame [on hold]

  22 juillet 2013, par Terry

  I want to write a video file player using ffmpeg(support many format).

  However ffmpeg(/ffplay.exe) using SDL to render the video frame and play the audio sound. I only want to support windows platform. I think the default windows technology/api is more suitalbe for me to render the decoded frame. Do you think so ?

  If so, should I use direct show, or just using direct draw for video frame and direct sound for audio frame.

  If using direct show, I think I need to wrapper a direct show source filter(/splitter), then pass down the decoded video/audio frame data to render filter.

  Please help me which is the best choice ?

• Compile ffmpeg with librtmp

  22 avril 2013, par HighFlyingFantasy

  When compiling ffmpeg for OSX, I can simply use the :

  ./configure --enable-librtmp --enable-gpl

  command and get a build that can I/O with an rtmp stream.

  If I attempt to compile for iOS using :

  ./configure \
  
  --disable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-ffserver \
  
  --disable-mmx \
  
  --enable-gpl \
  
  --enable-shared \
  
  --enable-librtmp \
  
  --enable-avresample \
  
  --enable-cross-compile \
  
  --enable-pic \
  
  --sysroot="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs /iPhoneOS6.1.sdk" \
  
  --target-os=darwin \
  
  --cc="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-gcc-4.2" \
  
  --extra-cflags="-arch armv7s -mfpu=neon -miphoneos-version-min=6.1" \
  
  --extra-ldflags="-arch armv7s -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk -miphoneos-version-min=6.1" \
  
  --arch=arm \
  
  --cpu=cortex-a9 \
  
  --prefix=compiled/armv7s 

  it errors out saying ERROR: librtmp cannot be found. Specifically :

      /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-gcc-4.2 -arch armv7s -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk -miphoneos-version-min=6.1 --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk -Wl,-dynamic,-search_paths_first -I/usr/local/include -L/usr/local/lib -o /var/folders/4m/8hcrycqx777_ksz6d32nrn_m0000gp/T//ffconf.b2zp97z8 /var/folders/4m/8hcrycqx777_ksz6d32nrn_m0000gp/T//ffconf.VhdlpSe1.o -lrtmp -lz -lssl -lcrypto -lm -lbz2 -lz
  
  ld: warning: ld: warning: ignoring file /usr/local/lib/librtmp.dylib, file was built for unsupported file format ( 0xcf 0xfa 0xed 0xfe 0x 7 0x 0 0x 0 0x 1 0x 3 0x 0 0x 0 0x 0 0x 6 0x 0 0x 0 0x 0 ) which is not the architecture being linked (armv7s): /usr/local/lib/librtmp.dylibignoring file /usr/local/lib/libz.a, file was built for archive which is not the architecture being linked (armv7s): /usr/local/lib/libz.a
  
  
  
  Undefined symbols for architecture armv7s:
  
    "_RTMP_Socket", referenced from:
  
        _check_RTMP_Socket in ffconf.VhdlpSe1.o
  
       (maybe you meant: _check_RTMP_Socket)
  
  ld: symbol(s) not found for architecture armv7s
  
  collect2: ld returned 1 exit status
  
  ERROR: librtmp not found

  I have already compiled openssl for ios using ios-openssl found on github and librtmp through rtmpdump