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• Revision 26fead7ecf : Renaming in MB_MODE_INFO The macro block mode info context originally contained

  13 août 2013, par Paul Wilkins

  Changed Paths :
   Modify /vp9/common/vp9_alloccommon.c

  
   Modify /vp9/common/vp9_blockd.h

  
   Modify /vp9/common/vp9_debugmodes.c

  
   Modify /vp9/common/vp9_loopfilter.c

  
   Modify /vp9/common/vp9_mvref_common.c

  
   Modify /vp9/common/vp9_postproc.c

  
   Modify /vp9/common/vp9_pred_common.c

  
   Modify /vp9/common/vp9_pred_common.h

  
   Modify /vp9/decoder/vp9_decodemv.c

  
   Modify /vp9/decoder/vp9_decodframe.c

  
   Modify /vp9/encoder/vp9_bitstream.c

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_rdopt.c

  
   Modify /vp9/encoder/vp9_tokenize.c

  
  
  Renaming in MB_MODE_INFO

  The macro block mode info context originally contained an
  entry for each 16x16 macroblock. In VP9 each entry refers
  to an 8x8 region not a macro block, so the naming is misleading.

  This first stage clean up changes the names of 3 entries in the
  structure to remove the mb_ prefix.

  TODO clean up the nomenclature more widely in respect of
  mbmi and bmi.

  Change-Id : Ia7305c6d0cb805dfe8cdc98dad21338f502e49c6

• Game Music Appreciation, One Year Later

  1er août 2013, par Multimedia Mike — General

  I released my game music website last year about this time. It was a good start and had potential to grow in a lot of directions. But I’m a bit disappointed that I haven’t evolved it as quickly as I would like to. I have made a few improvements, like adjusting the play lengths of many metadata-less songs and revising the original atrocious design of the website using something called Twitter Bootstrap (and, wow, once you know what Bootstrap is, you start noticing it everywhere on the modern web). However, here are a few of the challenges that have slowed me down over the year :

  Problems With Native Client – Build System
  The technology which enables this project — Google’s Native Client (NaCl) — can be troublesome. One of my key frustrations with the environment is that every single revision of the NaCl SDK seems to adopt a completely new build system layout. If you want to port your NaCl project forward to newer revisions, you have to spend time wrapping your head around whatever the favored build system is. When I first investigated NaCl, I think it was using vanilla GNU Make. Then it switched to SCons. Then I forgot about NaCl for about a year and when I came back, the SDK had reverted back to GNU Make. While that has been consistent, the layout of the SDK sometimes changes and a different example Makefile shows the way.

  The very latest version of the API has required me to really overhaul the Makefile and to truly understand the zen of Makefile programming. I’m even starting to grasp the relationship it has to functional programming.

  Problems With Native Client – API Versions and Chrome Bugs
  I built the original Salty Game Music Player when NaCl API version 16 was current. By the time I published the v16 version, v19 was available. I made the effort to port forward (a few APIs had superfically changed, nothing too dramatic). However, when I would experiment with this new player, I would see intermittent problems on my Windows 7 desktop. Because of this, I was hesitant to make a new player release.

  Around the end of May, I started getting bug reports from site users that their Chrome browsers weren’t allowing them to activate the Salty Game Music Player — the upshot was that they couldn’t play music unless they manually flipped a setting in their browser configuration. It turns out that Chrome 27 introduced a bug that caused this problem. Not only that, but my player was one of only 2 known NaCl apps that used the problematic feature (the other was developed by the Google engineer who entered the bug).

  After feeling negligent for a long while about not doing anything to fix the bug, I made a concerted and creative effort to work around the bug and pushed out a new version of the player (based on API v25). My effort didn’t work and I had to roll it back somewhat (but still using the new player binaries). The bug was something that I couldn’t work around. However, at about the same time that I was attempting to do this, Google was rolling out Chrome 28 which fixed the bug, rendering my worry and effort moot.

  Problems With Native Client – Still Not In The Clear
  I felt reasonably secure about releasing the updated player since I couldn’t make my aforementioned problem occur on my Windows 7 setup anymore. I actually have a written test plan for this player, believe it or not. However, I quickly started receiving new bug reports from Windows users. Mostly, these are Windows 8 users. The player basically doesn’t work at all for them now. One user reports the problem on Windows 7 (and another on Windows 2008 Server, I think). But I can’t see it.

  I have a theory about what might be going wrong, but of course I’ll need to test it, and determine how to fix it.

  Database Difficulties
  The player is only half of the site ; the other half is the organization of music files. Working on this project has repeatedly reminded me of my fundamental lack of skill concerning databases. I have a ‘production’ database– now I’m afraid to do anything with it for fear of messing it up. It’s an an SQLite3 database, so it’s easy to make backups and to create a copy in order to test and debug a new script. Still, I feel like I’m missing an entire career path worth of database best practices.

  There is also the matter of ongoing database maintenance. There are graphical frontends for SQLite3 which make casual updates easier and obviate the need for anything more sophisticated (like a custom web app). However, I have a slightly more complicated database entry task that I fear will require, well, a custom web app in order to smoothly process hundreds, if not thousands of new song files (which have quirks which prohibit the easy mass processing I have been able to get away with so far).

  Going Forward
  I remain hopeful that I’ll gradually overcome these difficulties. I still love this project and I have received nothing but positive feedback over the past year (modulo the assorted recommendations that I port the entire player to pure JavaScript).

  You would think I would learn a lesson about building anything on top of a Google platform in the future, especially Native Client. Despite all this, I have another NaCl project planned.

• how to fix ffmpeg error 'frame crc mismatch'

  9 août 2013, par Sam

  I am trying to re-encode a video file using ffmpeg but every time I try to run it

  ffmpeg -i  -c:v libx264 -crf 25 -preset slow -c:a libfaac 

  it does the first five minutes or so of the video and then gives the following error and stops :

  frame CRC mismatch
  
  [matroska,webm @ 0x7ff609806600] Unknown entry 0x762F
  
  [matroska,webm @ 0x7ff609806600] Unknown entry 0x4B61
  
  [matroska,webm @ 0x7ff609806600] Unknown entry 0xA2
  
  [matroska,webm @ 0x7ff609806600] Unknown entry 0x7F38
  
  [matroska,webm @ 0x7ff609806600] Unknown entry 0x39E0B1
  
  frame= 7473 fps=8.3 q=30.0 size=   42488kB time=-577014:-32:-22.-77 bitrate=N/A 
  
  frame= 7473 fps=8.2 q=-1.0 Lsize=   43099kB time=00:05:12.06 bitrate=1131.4kbits/s    
  
  video:35549kB audio:7338kB subtitle:0 global headers:0kB muxing overhead 0.494802%
  
  [libx264 @ 0x7ff609826c00] frame I:70    Avg QP:21.35  size: 41968
  
  [libx264 @ 0x7ff609826c00] frame P:2000  Avg QP:24.37  size:  9139
  
  [libx264 @ 0x7ff609826c00] frame B:5403  Avg QP:26.21  size:  2811
  
  [libx264 @ 0x7ff609826c00] consecutive B-frames:  1.8%  2.7%  8.5% 87.1%
  
  [libx264 @ 0x7ff609826c00] mb I  I16..4: 25.7% 61.5% 12.8%
  
  [libx264 @ 0x7ff609826c00] mb P  I16..4:  5.3%  5.5%  0.5%  P16..4: 39.9%  6.3%  5.4%  0.0%  0.0%    skip:37.2%
  
  [libx264 @ 0x7ff609826c00] mb B  I16..4:  0.2%  0.4%  0.0%  B16..8: 36.6%  1.5%  0.2%  direct: 0.6%  skip:60.5%  L0:40.3% L1:58.3% BI: 1.3%
  
  [libx264 @ 0x7ff609826c00] 8x8 transform intra:52.6% inter:89.8%
  
  [libx264 @ 0x7ff609826c00] direct mvs  spatial:100.0% temporal:0.0%
  
  [libx264 @ 0x7ff609826c00] coded y,uvDC,uvAC intra: 38.4% 47.1% 8.5% inter: 6.5% 10.0% 0.0%
  
  [libx264 @ 0x7ff609826c00] i16 v,h,dc,p: 34% 18%  8% 39%
  
  [libx264 @ 0x7ff609826c00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 11%  7% 10% 10% 14% 13% 13% 11% 11%
  
  [libx264 @ 0x7ff609826c00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 11%  6%  8% 13% 12% 12% 10% 12%
  
  [libx264 @ 0x7ff609826c00] i8c dc,h,v,p: 55% 21% 18%  6%
  
  [libx264 @ 0x7ff609826c00] Weighted P-Frames: Y:1.2% UV:0.9%
  
  [libx264 @ 0x7ff609826c00] ref P L0: 57.7% 10.2% 19.2%  5.9%  6.5%  0.5%  0.0%
  
  [libx264 @ 0x7ff609826c00] ref B L0: 82.1% 13.2%  3.6%  1.0%
  
  [libx264 @ 0x7ff609826c00] ref B L1: 94.8%  5.2%
  
  [libx264 @ 0x7ff609826c00] kb/s:934.32

  If I play the original video file in VLC, the frames at the point where the encoding stops go glitchy for a few seconds but then comes good again.

  How can I get around this ? I don't really mind if those few seconds stay glitchy (although it would be nice if that could be fixed) but I do need to re-encode this video, with or without the glitchy couple of seconds...

  Even if I use another program like iFlicks to try and re-encode it does up to the same point and then stops. It also stops at the same point if I use ffmpeg to copy the codecs into a new mp4 container.