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• Is it possible to create new mp4 file from a single streaming byte range chunk ?

  22 avril 2014, par bevinlorenzo

  If I have a remote mp4 file on a server that supports Byte Ranges, is it possible to retrieve a single byte range and create a new/self-contained mp4 from that range data ?

  If I try and write a returned byte range data directly to an mp4 file using fs.createWriteStream(remoteFilename) it doesn’t get the video meta data (duration, dimensions, etc) that it needs to be playable.

  When I get a byte range that starts with 0 and ends with XX the output mp4 is playable, but will have the duration meta-data of the entire video length and will freeze the screen when the byte range is done for the remainder of the duration time.

  How else can I take a byte range and create a stand-alone .mp4 file from that stream object ?

  The whole point of this is to avoid downloading the entire 10 minute file before I can make a 5 second clip using ffmpeg. If I can calculate and download the byte range, there should be a way to write it to a standalone mp4 file.

  Thanks in advance for any help you can provide.

• Revision f7bd1274e3 : Enable vpxenc to specify internal coded frame size Added command line flags "re

  9 avril 2014, par Adrian Grange

  Changed Paths :
   Modify /vp8/vp8_cx_iface.c

  
   Modify /vp9/encoder/vp9_onyx_if.c

  
   Modify /vp9/encoder/vp9_onyx_int.h

  
   Modify /vp9/vp9_cx_iface.c

  
   Modify /vpx/vpx_encoder.h

  
   Modify /vpxenc.c

  
  
  Enable vpxenc to specify internal coded frame size

  Added command line flags "resize-width" & "resize-height"
  to allow the user to specify the frame size to encode at.

  These two flags are ignored if the "resize-allowed" switch
  is not set to 1.

  All frames in the clip are then encoded at this size, which
  must be smaller than the raw frame size.

  Change-Id : I3d64bd9303d5c0bd678461a866a1ea621700d744

• Split screen video cliping with FFMpeg

  11 avril 2014, par Justinas

  i have one video source with 4 different videos inside :
  

  As you can see, i'm using VLC to view it and there is only one controlling window. If i press stop button, every 4 videos will stop and so on.

  Problem is, i have to use FFMpeg and cut mini-clip from this source, so it will be playable in all 4 windows again. Clipping ordinary video works just fine with command ffmpeg.exe -y -i $input -ss $startTime -t $length -acodec copy -vcodec copy $output 2>&1. But when used for this one split-screen video, i get only one source clip instead of all 4 in same place.

  Any detailed information about this video is welcomed because i don't even know how exactly this type of video is called, as well as any information about clipping with ffmpeg that video.