Recherche avancée

Sur d’autres sites (4452)

• Big problems while compiling FFMPEG for iOS5

  7 juin 2013, par Vlad Bogdan

  I'm trying to compile the ffmpeg library for iOS5. I tried different options but none works.

  I downloaded this : https://github.com/ciphor/ffmpeg4ios .

  I tried the original build_armv7 but it didn't work. I edited the build_arm7 file and now it looks like this :

  #!/bin/tcsh -f
  
  
  
  if (! -d armv7) mkdir armv7
  
  if (! -d lib) mkdir lib
  
  
  
  rm armv7/*.a
  
  
  
  make clean
  
  
  
  ./configure --disable-network --disable-mpegaudio-hp --disable-lpc --disable-vaapi 
  
  --disable-vdpau --disable-hwaccels --disable-mmx --disable-mmx2 --disable-sse 
  
  --disable-ssse3 --disable-avx --disable-amd3dnow --disable-amd3dnowext --disable-vis 
  
  --disable-mmi --disable-doc --disable-yasm --disable-ffmpeg --disable-ffplay 
  
  --disable-ffprobe --disable-ffserver --disable-rdft --disable-dxva2 --disable-encoders 
  
  --disable-decoders --enable-decoder=h264 --disable-bsfs --disable-protocols 
  
  --disable-indevs --disable-outdevs --disable-devices --disable-filters --disable-demuxers --enable-demuxer=h264 
  
  --disable-muxers --disable-parsers --enable-parser=h264 --enable-cross-compile --arch=arm 
  
  --target-os=darwin 
  
  --cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-llvm-gcc-4.2 --as='gas-preprocessor/gas-preprocessor.pl /Aplications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-llvm-gcc-4.2' 
  
  --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk --cpu=cortex-a8 
  
  --extra-cflags='-pipe -Os -gdwarf-2 -issysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk -m${thumb_opt:-no-thumb} 
  
  -mthumb-interwork' --extra-ldflags='-arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk' --enable-pic
  
  
  
  
  
  make
  
  
  
  mv libavcodec/libavcodec.a armv7/
  
  mv libavdevice/libavdevice.a armv7/
  
  mv libavformat/libavformat.a armv7/
  
  mv libavutil/libavutil.a armv7/
  
  mv libswscale/libswscale.a armv7/
  
  
  
  rm lib/*.a
  
  
  
  cp armv7/*.a lib/

  But i get this error :

  /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-llvm-gcc-4.2 is unable to create an executable file.
  C compiler test failed.

  I looked all over the Internet. I have read all the posts on stackoverflow about this but none helped me. Please tell me what i'm doing wrong and please don't post me links : trust me, i saw them all !

• Want to convert my 16:9 size MKV video to 4:3 size AVI video file

  19 septembre 2012, par Bimal Rekhadiya

  I have a video in MKV format and it's size is 720x304 (16:9 ratio) size video.

  I want to convert it to AVi format (using xvid video codec). The output file size should be 480x360 (4:3 ratio) and also want to keep the original (16:9) ratio so it should be cinemascope (black areas at top and bottom).

  I am on Ubuntu linux OS so I can use mencoder, avconv(ffmpeg) or any tool that work on Linux.

  I am trying this command :

  avconv -i sample.mkv -vcodec libxvid -r 25 -b 1200 -aspect 4:3 -q 1 t.avi

  But the problem is that the video is stretched to 4:3 and I want to keep original video's ratio and want to add black boxes at top and bottom so it will look cinemascope.

  Please provide me command to do this.

• Converting .mp4 to .webm with FFMPEG

  24 septembre 2012, par DAVYM

  Any chance someone can help me make this a 2 or 3 pass command :

  Using "FFmpeg Win64 Static build by Kyle Schwarz, compiled on : Sep 19 2012 16:31:43" in the Command Prompt of Windows7(x64). I am a newbie to FFMPEG and trying to convert videos for my website from .mp4 to .webm (videos edited and mixed in AdobePremiereProCS6 where then encoded into .mp4 from .mts Canon HXG10 recordings). Original video file is 1080p quality.

  c :\ff/ffmpeg -i c :\ff/xxx.mp4 -codec:v libvpx -quality good -cpu-used
  0 -b:v 7000k -qmin 10 -qmax 42 -maxrate 500k -bufsize 1500k -threads 8
  -vf scale=-1:1080 -codec:a libvorbis -b:a 192k -f webm c :\ff/xxx.webm