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• intrax8 : Use local destination buffers

  20 février 2016, par Vittorio Giovara

  intrax8 : Use local destination buffers
  These buffers are just a way to store frame pointers and be able to
  
  modify them without touching the original ones.
  The two dependent decoders (WMV2 and VC1) do not need special care for
  
  these fields : the former does not seem to use the dest buffers, while
  
  the latter reinits them every time to the current frame data buffers.
  So only keep a local copy rather than the one from mpegvideo.
  

  • [DBH] libavcodec/intrax8.c
  • [DBH] libavcodec/intrax8.h

• Capture ffmpeg's metadata output in powershell

  17 mars 2016, par xdhmoore

  I’m trying to capture the output of ffmpeg in PowerShell(tm) to get some metadata on some ogg & mp3 files. But when I do :

  ffmpeg -i file.ogg 2>&1 | sls GENRE

  The output includes a bunch of lines without my matching string, "GENRE" :

        album_artist    : Post Human Era
  
        ARTIST          : Post Human Era
  
        COMMENT         : Visit http://posthumanera.bandcamp.com
  
        DATE            : 2013
  
        GENRE           : Music
  
        TITLE           : Supplies
  
        track           : 1
  
  At least one output file must be specified

  I am guessing something is different in the encoding. ffmpeg’s output is colored, so maybe there are color control characters in the output that are breaking things ? Or, maybe ffmpeg’s output isn’t playing nicely with powershell’s default UTF-16 ? I can’t figure out if there is another way to redirect stderr and remove the color characters or change the encoding of stderr.

  EDIT :
  Strangely, I also get indeterminate output. Sometimes the output is as shown above. Sometimes with precisely the same command the output is :

        GENRE           :

  

  Which makes slightly more sense, but is still missing the part of the line I care about (’Music’).

  Somewhere powershell is interpreting something as newlines that is not newlines.

• Java, serve HLS live video streams

  12 février 2016, par momo

  I know the topic is not an easy one, but I am looking for a Java class to send an HLS stream from the server to the client.

  I have files being generated greater and greater :

  out.m3u8
  
  out0.ts
  
  out1.ts
  
  out2.ts
  
  out3.ts
  
  out4.ts
  
  out5.ts
  
  out6.ts

  This is generated using ffmpeg from an original source :

  ffmpeg -i http://sourceurl.com:9981/stream/channel/1232131 out.m3u8

  I can play it using VLC.

  Somehow, I need to stream this live to the clients.

  At this point, I do not really care about different bit rates, i just want live streaming to work, in mobile browsers and on desktop browsers.

  I found this class :

  https://github.com/Red5/red5-hls-plugin/blob/master/plugin/src/main/java/org/red5/stream/http/servlet/PlayList.java

  Which might be doing something like that.

  I have pulled in hls.js into my application in hopes of using it for desktops.

  HLS should however work IOS devices without hls.js right now.

  How should one serve HLS content from the server ? It’s very difficult to find any good and simple example to do that.

  Anyone knows of the steps needed to do that ?

  I’ve looked into Wowza and Red5 just a little bit, but unsure what they can provide for me at this stage and seems to be overly complicated to setup just to serve some files. But please explain to me why that’s not the case.