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• Simulate concatenated file using hard link ?

  16 décembre 2011, par Sugrue

  I have multiple parts of a single file which I want a 3rd party c++/c# plugin to read as a single file. Basically, when the plugin file reader gets to the end of one file-part, I want it to continue to the next one.

  (For anyone interested, the plugin is Aforge.Net FFMpeg, and I am trying to import VOB files)

  It looks like quite a task to reprogram the plugin. An alternative solution is to copy the file parts to a concatenated file, but this is slow because I am dealing with many GBs of data.

  Is it possible to use a file system hard link to point to multiple files ? Or is there some other way to 'fake' a concatenated file ? Using command line FFMpeg I can use 'type' to live stream a concatenate file in, but I can't figure out how to achieve this in c# with this plugin.

  I am on Windows 7.

• Split video file from 'n' th frame to end of video in Linux

  17 novembre 2011, par Skkard

  I need to split a video file using frames as the measure, e.g. I need to save the part of the video from the 34th frame to the end of the video in Linux( specifically fedora 16, xfce, 64bit ).

  I've tried using ffmpeg, using the '-vframes' option to specify how many frames to save, but it starts from the beginning, so is not that useful. How can I start from a certain frame in between the video and save the video from there to the end in a new file.

  I know about the '-ss' option, but while converting number of frames to the specified time, there might be errors( or so I believe. Please correct me if I'm wrong ) due to rounding.

  Could you please suggest a method ? Thanks !

• Post processing in ffmpeg to move 'moov atom' in MP4 files (qt-faststart)

  12 septembre 2014, par siliconpi

  Is it possible to run ffmpeg from the command line which will either place the ’moov atom’ metadata in the beginning of the MP4 file or run the qt-faststart as a post processing operation in ffmpeg so the generated file is stream-able through the internet ?

  I can of course run it as a separate command, but would prefer it to be something

  • as an option within ffmpeg, or
  • as part of a post conversion, command line option when converting the video files via ffmpeg

  ---

  Edit 1

  http://ffmpeg.org/ffmpeg.html#mov

  MOV / MP4 muxer

  The muxer options are :

  ‘-moov_size bytes’

  Reserves space for the moov atom at the beginning of the file instead of 
  
  placing the moov atom at the end. If the space reserved is insufficient, 
  
  muxing will fail.