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• Mux audio and video with c api ffmpeg [on hold]

  18 juillet 2014, par EricNguyen

  I just wanna muxing video file. Same as in this link

  I’m try to read sample from ffmpeg home page, but it makes me confuse. Can anyone share some more sample about this ?

  And i’ve use ffmpeg sample, but the result is a video with all black frames :(

• OS X uploads .mp4 as quicktime ? [on hold]

  15 janvier 2014, par daled

  I'm running into a rather peculiar issue uploading .mp4 from any browser on OS X. I'm using ffmpeg to convert files and .mp4's uploaded from OS X are causing issues.

  First off, the file I'm uploading is not corrupt. Here is the relevant exiftool output on the file I'm uploading. This is the original file on the client.

  File Type                       : MP4
  
  MIME Type                       : video/mp4
  
  Major Brand                     : MP4 Base w/ AVC ext [ISO 14496-12:2005]
  
  Minor Version                   : 0.0.0
  
  Compatible Brands               : avc1, isom

  Now here's the exiftool output on the server for the same file :

  File Type                       : MOV
  
  MIME Type                       : video/quicktime
  
  Major Brand                     : Apple QuickTime (.MOV/QT)
  
  Minor Version                   : 2005.3.0
  
  Compatible Brands               : qt

  Ffmpeg will recognize the first file just fine. Everything will work perfectly and I can convert it however I choose. But the second file, I'll get this error :

  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x3855180] stream 0, error opening alias: path='/Users/', dir='20130602-113438', filename='GOPR0018.MP4', volume='Macintosh HD', nlvl_from=-1, nlvl_to=-1
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x3855180] stream 1, error opening alias: path='/Users/', dir='20130602-113438', filename='GOPR0018.MP4', volume='Macintosh HD', nlvl_from=-1, nlvl_to=-1

  Here is the FFmpeg command I am using :

  ffmpeg -y -probesize 2147483647 -analyzeduration 2147483647 -i "'.$oldFilename.'" -vcodec libtheora -q:v 0 -acodec libvorbis -q:a 0 "'.$newFilenameOGG.'" 2>&1

  This command works fine with every file type besides this file. It seems like ffmpeg is seeing the uploaded file as a corrupt quicktime file instead of a valid mp4 file. So my question is, how is this metadata magically changing ?

• How can i write a tool that acquires video/audio from my input video card ? [on hold]

  21 juillet 2014, par user3180895

  i’d like to write a simple program that can read audio and video from my input card and can save it in a file.

  I’d like to write it in Java, but if it is not possible, i can change language.
  I tried to use ffmpeg, but my device has crossbar limitations.

  My question is :

  Exists one library which can read input buffer from my device and save it in a file ?

  Can someone post a "Hello World" code for a simple example ?

  Thanks a lot.

  P.S. I am actual working with Windows.