Newest 'ffmpeg' Questions - Stack Overflow

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• RoR ffmpeg installed by brew

  26 octobre 2012, par Thomas Kobber Panum

  I'm developing a Ruby on Rails application that needs ffmpeg, to do some processing of the files I have.

  However, when trying to use ffmpeg, I get this error

  Failed encoding. Errors: no output file created. Full output: dyld: Library not loaded: /usr/local/lib/libogg.0.dylib
  Referenced from: /usr/local/bin/ffmpeg
  Reason: Incompatible library version: ffmpeg requires version 9.0.0 or later, but libogg.0.dylib provides version 6.0.0
  

  It's a basically a CarrierWave project, which can be seen here: http://www.freezzo.com/2010/12/23/create-ffmpeg-processor-for-carrierwave-in-rails-3/

• How to get video dimensions using FFMPEG

  26 octobre 2012, par GethuJohn

  My goal is to pass a Video file to FFMPEG and to get its dimension as output.How can I achieve this. Can anyone help me out with sample code?

• Building FFMPEG library for iOS5.1 ARMv7 Processor

  26 octobre 2012, par Jimmy

  I cleaned up my question a little bit, when I wrote it the first time I was flustered. Now I can be more clear after taking a small break.

  I'm trying to use the FFMPEG library in an XCode 4.5.1 project. And I'm trying to build it for ARMv7. What I'm looking for is the exact process, and some explanation. I understand that this is not a well documented problem. But I know that other pople have had the same problem as me.

  What I have been able to do.

  I have been able to build the library for xCode. here Is what I have been able to do step by step.

  1) I have been able to clone ffmpeg. For beginners this will get you started by creating a directory with the ffmpeg source. (Kudos to the guys who wrote it)

  git clone git://source.ffmpeg.org/ffmpeg.git ffmpeg

  2) I have been able to write a config file that doesn't have any errors. We will go back to this part later. This is the command I attach to ./configure

  ./configure --disable-doc --disable-ffmpeg --disable-ffplay --disable-ffserver --enable-cross-compile --arch=arm --target-os=darwin --cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/llvm-gcc-4.2/bin/arm-apple-darwin10-llvm-gcc-4.2

  --as='gas-preprocessor/gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/llvm-gcc-4.2/bin/arm-apple-darwin10-llvm-gcc-4.2'

  --sysroot=/applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk

  --cpu=cortex-a8 --extra-ldflags='-arch=armv7 -isysroot /applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk' --enable-pic --disable-bzlib --disable-gpl --disable-shared --enable-static --disable-mmx --disable-debug --disable-neon --extra-cflags='-pipe -Os -gdwarf-2 -isysroot /applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk -m${thumb_opt:-no-thumb} -mthumb-interwork'

  These are some things to note.

  • I had to download ( https://github.com/yuvi/gas-preprocessor ) copy the file gas-preprocessor.pl at /usr/local/bin. Set permissions to read write (777)
  • Make sure I'm using the right GCC compiler: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/llvm-gcc-4.2/bin/arm-apple-darwin10-llvm-gcc-4.2
  • Make sure I'm using the right SDK: /applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk
  • --extra-cflags="-arch armv7" causes: error: unrecognized command line option “-arch”

  Here in lies the problem.

  When I include the library and the declaration. Everything works fine! (You will want to make sure your library paths in xcode are properly written if it can't find the library. There are plenty of people with this problem, stackover flow has a wealth of knowledge here)

  But when I started to write the encoder. I received this warning, and countless errors.

  ignoring file /Users/Jimmy/Development/source.ffmpeg/Library/libavutil.a, file was built for archive which is not the architecture being linked (armv7s): /Users/Jimmy/Development/source.ffmpeg/Library/libavutil.a

  That means that I didn't build for ARMv7 and that -arch configuration I took out is actually essential.

  What I'm looking for is someone whose done it before, to walk all of us through the process of building FFMPEG for iOS5.1 and ARMv7 and the majority of things to look out for. If no one comes forth, in time I'll answer my own question and hopefully help out others who are struggling too.

• Fastest way to create a multi-page tiff

  26 octobre 2012, par user1414470

  I need to create a multi-frame tiff file to store large number of images. Time consumption is very important here. Also my initial format is an 'avi' video so if i can change it directly it'd be great. Can you tell me how to do that? weather it is through programming or using some software isn't important but it would be great if it were through just ffmpeg(I'm already doing the frame separation with ffmpeg).

  Thank you

• How to merge audio and images with ffmpeg ? [closed]

  25 octobre 2012, par Ello

  I'm trying to merge an audio file and some images file to video with ffmpeg.

  If the audio's time is shorter than the video(which is merged by images),i want to loop the audio to fit the video.but how should i do ,i'm trying many times,but fail.

  Any pointer for the solution?

  If the video's time is shorter than the audio,i want to cut the audio to fit the video.

  First i get the video's time,(e.g., 10 seconds).

  Then i use ffmpeg -i input.mp3 -t 10 output.mp3 to make a shorter audio.

  At last i use ffmpeg -i %d.jpg -i a2.mp3 -strict -2 test.mp4 to merge the audio and images.

  The second question is that is there any beter way to do this?