Recherche avancée

Sur d’autres sites (8935)

• Can I run a program from Command Prompt on only a numbered subset of files ?

  28 août 2020, par Andrew Shibata

  I have an experiment with 2 groups : English speakers and Mandarin-English bilinguals. I have a batch file that works for converting audio files (using ffmpeg) for the English monolingual group. The Mandarin speaker group also has a few additional trials where they record some more sentences in Mandarin and I'd like to either run ffmpeg separately on just those trials or move that subset to a different folder after the fact.

  


  The file formats are [subject ID]-[trial #]-vowels_record.ogg. The English trials are trial #s 6-35 and the Mandarin trials are trial #s 36-50.

  


  The following code WORKS for my English only dataset :

  


  for %%a in ("*vowels_record.ogg") do ffmpeg -i "%%a" "vowel_wavs\%%~na.wav

  


  This is my attempt at figuring out how to get just the relevant files into relevant folders :

  


  for %%a in ("*{6..35}-vowels_record.ogg") do ffmpeg -i "%%a" "vowel_wavs\%%~na.wav"
for %%a in ("*{36..50}-vowels_record.ogg") do ffmpeg -i "%%a" "mandarin_wavs\%%~na.wav"


  


  I have some regex experience, but not as much with making .bat files and I'm unsure what the right way is to target the range of files I'm looking for.

  


• How to extract orientation information from videos ?

  23 décembre 2016, par Sid

  After surfing through tons of documentation on the web it seems that the iPhone always shoots the video at a 480x360 aspect ratio and applies a transformation matrix on the video track. (480x360 may change but its always the same for a given device)

  Here is a way of modifying the ffmpeg source within a iOS project and accessing the matrix http://www.seqoy.com/correct-orientation-for-iphone-recorded-movies-with-ffmpeg/

  Here is a cleaner way of finding the transformation matrix in iOS-4
  how to detect (iphone sdk) if a video file was recorded in portrait orientation, or landscape

  How can the orientation of the video be extracted in either of the options below -
  
   iOS 3.2
  
   ffmpeg (through the command line server side)
  
   ruby
  

  Any help will be appreciated.

• Loading ffmpeg-php module fails

  21 août 2013, par i.h4d35

  I've been trying this for a couple of days now. I am trying to install ffmpeg-php on my CentOS server.

  • OS : CentOS 6
  • PHP : 5.5
  • ffmpeg : 1.2.1
  • ffmpeg-php : 0.6.0

  The ffmpeg installation went on without a hitch and I am able to convert files back and forth via the CLI.

  While installing ffmpeg-php, I encountered errors while making (after configuring) due to time.h references which was corrected by renaming the files creating with an extension .loT to .lo (as rightly pointed out here)

  Once this was done, the make process went on smoothly and the make install went through without a hitch. However, after specifying the extension=ffmpeg.so in the php.ini file and after restarting Apache, the module doesn't load or show up in phpinfo().

  The Apache error log shows only "PHP Warning : PHP Startup : Invalid library (maybe not a PHP library) 'ffmpeg.so' in Unknown on line 0" and nothing else.

  make test also shows the same error and FAILS the associated tests. I've checked here which wasn't very helpful. Also, I read somewhere that it may be the issue with permissions but the permissions for the ffmpeg.so file is 755.

  Any help is appreciated.

  Thanks in advance.