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• Museum of Multimedia Software, Part 4

  20 août 2010, par Multimedia Mike — Software Museum

  This is the last part of the series, at least until some more multimedia software shows up at my favorite thrift shop or the other boneyards I scavenge.

  Miscellaneous Multimedia Programs
  This set includes the titles Matinee FMV Screensaver, MetaCreations Painter Classic, and Multimedia JumpStart. The second one is likely a creation program. I have no idea what the third one is, while the first title gives me chills just thinking about the implications.

  
  
  

  Miscellaneous Creativity Software
  Magic Theatre and Microsoft Home : Creative Writer. I think I loaded up the former once to find a very basic animation program. The latter isn’t necessarily multimedia-related but certainly classifies as creative software. It also reminds me of the ad I once spied in Entertainment Weekly magazine during the mid-1990s for a Microsoft music history CD-ROM. MS branched out into all kinds of niches.

  
  
  

  More Multimedia Creativity Software
  VideoCraft and U-Create Games & Animation. I wager these would be fun to play around with if I had the time.

  
  
  

  Showcase CD-ROMs
  "What Can You Make ? Showcase 7" from Macromedia and Microsoft Multimedia Pack 10.

  
  
  

  Basic Multimedia Software Discs
  As a multimedia nerd, these Apple QuickTime and Microsoft Video for Windows discs make me sentimental.

  
  
  

  Real Software Collection
  Grit your teeth and gaze upon CD-ROM distributions of Real’s software. There is a RealAudio disc back from when Real still called themselves Progressive Networks. "Everything you need to hear the web roar !"

  
  
  

  Clips
  And a few multimedia clip CD-ROMs, along with a disc that promises to test and tune your MPC setup.

  
  
  

  Wrap-Up
  I would be remiss if I neglected to mention a few more pieces of multimedia creation software in my collection. First, there’s the Barbie Storymaker. I actually gave that one a go, as you can tragically see from that link. Further, the Taco Bell fast food restaurant chain ran, as one of their many kids meal promotions, a series of 4 simple Comics Constructor CD-ROMs. I played briefly with it here and again during an exploration of XML data formats and the parsing thereof (which the software uses).

• My crazy linux.conf.au week

  9 février 2012, par silvia

  In January I attended the annual Australian Linux and Open Source conference (LCA). But since I was sick all of January and had a lot to catch up on, I never got around to sharing all the talks that I gave during that time.

  Drupal Down Under

  It started with a talk at Drupal Down Under, which happened the weekend before LCA. I gave a talk titled “HTML5 video specifications” (video, slides).

  I spoke about the video and audio element in HTML5, how to provide fallback content, how to encode content, how to control them from JavaScript, and briefly about Drupal video modules, though the next presentation provided much more insight into those. I explained how to make the HTML5 media elements accessible, including accessible controls, captions, audio descriptions, and the new WebVTT file format. I ran out of time to introduce the last section of my slides which are on WebRTC.

  Linux.conf.au

  On the first day of LCA I gave a talk both in the Multimedia Miniconf and the Browser Miniconf.

  Browser Miniconf

  In the Browser Miniconf I talked about “Web Standardisation – how browser vendors collaborate, or not” (slides). Maybe the most interesting part about this was that I tried out a new slide “deck” tool called impress.js. I’m not yet sure if I like it but it worked well for this talk, in which I explained how the HTML5 spec is authored and who has input.

  I also sat on a panel of browser developers in the Browser Miniconf (more as a standards than as a browser developer, but that’s close enough). We were asked about all kinds of latest developments in HTML5, CSS3, and media standards in the browser.

  Multimedia Miniconf

  In the Multimedia Miniconf I gave a “HTML5 media accessibility update” (slides). I talked about the accessibility problems of Flash, how native HTML5 video players will be better, about accessible video controls, captions, navigation chapters, audio descriptions, and WebVTT. I also provided a demo of how to synchronize multiple video elements using a polyfill for the multitrack API.

  I also provided an update on HTTP adaptive streaming APIs as a lightning talk in the Multimedia Miniconf. I used an extract of the Drupal conference slides for it.

  Main conference

  Finally, and most importantly, Alice Boxhall and myself gave a talk in the main linux.conf.au titled “Developing Accessible Web Apps – how hard can it be ?” (video, slides). I spoke about a process that you can follow to make your Web applications accessible. I’m writing a separate blog post to explain this in more detail. In her part, Alice dug below the surface of browsers to explain how the accessibility markup that Web developers provide is transformed into data structures that are handed to accessibility technologies.

• ffmpeg C API weird behaviour when running

  6 février 2023, par Turgut

  I have a c++ project which I've been using for a while (on a stable build now), recently I had a new debian setup a few days ago and I've set everything up. I set up ffmpeg like I always do and some of my other projects which also depend on ffmpeg seems to be working fine. I've checked ffplay and it works, along with the many different input videos I'm trying with. However, when I try to run the project mentioned, I get various weird behaviours on different videos. For example : some of them say moov atom not found, some of them throw a seg-fault, some of them just crashes the program without any warnings or segfaults or anything.

  


  Like I've said this is a fresh new debian build and the project is working just fine on other computers including this computer before I got a fresh debian (it was debian before aswell).

  


  Here is how I set up ffmpeg :

  


  

  1. Pull ffmpeg from it's github page and checkout to latest stable build branch (5.1)

  


  2. Sudo install dependencies like libx264-dev and nasm and a few more

  


  3. run ./configure --extra-libs="-lpthread -lm" --ld="g++" --disable-static --enable-shared --enable-gpl --enable-gnutls --enable-libfreetype --enable-nonfree --enable-libx264 --enable-opencl --enable-opengl

  


  4. run make, then sudo make install and finally sudo ldconfig.

  


  


  About the errors :

  


  

  • If I'm not getting a seg fault but the program just crashes without any errors, when I run valgrind it doesn't say anything (on .mp4 and .avi files mostly). So I ran with the --leak-check=full flag and get the following output (cropped some of it) :

  


  


  ...
==220709== 132 bytes in 1 blocks are possibly lost in loss record 323 of 386
==220709==    at 0x483AB65: calloc (vg_replace_malloc.c:760)
==220709==    by 0x8C67DA0: g_malloc0 (in /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6600.8)
==220709==    by 0x8BE51E4: ??? (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.8)
==220709==    by 0x8BE8589: g_type_register_fundamental (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.8)
==220709==    by 0x8BCB531: ??? (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.8)
==220709==    by 0x8BC49C7: ??? (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.8)
==220709==    by 0x400FFE1: call_init.part.0 (dl-init.c:72)
==220709==    by 0x40100E8: call_init (dl-init.c:30)
==220709==    by 0x40100E8: _dl_init (dl-init.c:119)
==220709==    by 0x40010C9: ??? (in /usr/lib/x86_64-linux-gnu/ld-2.31.so)
==220709== 
==220709== 148 bytes in 1 blocks are possibly lost in loss record 327 of 386
==220709==    at 0x483AB65: calloc (vg_replace_malloc.c:760)
==220709==    by 0x8C67DA0: g_malloc0 (in /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6600.8)
==220709==    by 0x8BE4FEA: ??? (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.8)
==220709==    by 0x8BE8589: g_type_register_fundamental (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.8)
==220709==    by 0x8BD4B2B: ??? (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.8)
==220709==    by 0x8BC49D1: ??? (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.8)
==220709==    by 0x400FFE1: call_init.part.0 (dl-init.c:72)
==220709==    by 0x40100E8: call_init (dl-init.c:30)
==220709==    by 0x40100E8: _dl_init (dl-init.c:119)
==220709==    by 0x40010C9: ??? (in /usr/lib/x86_64-linux-gnu/ld-2.31.so)
==220709== 
==220709== 148 bytes in 1 blocks are possibly lost in loss record 328 of 386
==220709==    at 0x483AB65: calloc (vg_replace_malloc.c:760)
==220709==    by 0x8C67DA0: g_malloc0 (in /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6600.8)
==220709==    by 0x8BE4FEA: ??? (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.8)
==220709==    by 0x8BE8589: g_type_register_fundamental (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.8)
==220709==    by 0x8BCFBF3: ??? (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.8)
==220709==    by 0x8BC49D6: ??? (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.8)
==220709==    by 0x400FFE1: call_init.part.0 (dl-init.c:72)
==220709==    by 0x40100E8: call_init (dl-init.c:30)
==220709==    by 0x40100E8: _dl_init (dl-init.c:119)
==220709==    by 0x40010C9: ??? (in /usr/lib/x86_64-linux-gnu/ld-2.31.so)
==220709== 
==220709== 184 bytes in 1 blocks are possibly lost in loss record 339 of 386
==220709==    at 0x483AD7B: realloc (vg_replace_malloc.c:834)
==220709==    by 0x8C67DE7: g_realloc (in /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6600.8)
==220709==    by 0x8BE3B76: ??? (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.8)
==220709==    by 0x8BE87AC: g_type_register_static (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.8)
==220709==    by 0x8BD67DE: g_param_type_register_static (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.8)
==220709==    by 0x8BD915A: ??? (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.8)
==220709==    by 0x8BC49DB: ??? (in /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.8)
==220709==    by 0x400FFE1: call_init.part.0 (dl-init.c:72)
==220709==    by 0x40100E8: call_init (dl-init.c:30)
==220709==    by 0x40100E8: _dl_init (dl-init.c:119)
==220709==    by 0x40010C9: ??? (in /usr/lib/x86_64-linux-gnu/ld-2.31.so)
==220709== 
==220709== 1,502 (352 direct, 1,150 indirect) bytes in 1 blocks are definitely lost in loss record 368 of 386
==220709==    at 0x4838DEF: operator new(unsigned long) (vg_replace_malloc.c:342)
==220709==    by 0x1D19819D: ???
==220709==    by 0x1D177ED3: ???
==220709==    by 0x1D18AAC9: ???
==220709==    by 0x1D1683B0: ???
==220709==    by 0x400FFE1: call_init.part.0 (dl-init.c:72)
==220709==    by 0x40100E8: call_init (dl-init.c:30)
==220709==    by 0x40100E8: _dl_init (dl-init.c:119)
==220709==    by 0x4F82AEC: _dl_catch_exception (dl-error-skeleton.c:182)
==220709==    by 0x4014057: dl_open_worker (dl-open.c:758)
==220709==    by 0x4F82A8F: _dl_catch_exception (dl-error-skeleton.c:208)
==220709==    by 0x40138F9: _dl_open (dl-open.c:837)
==220709==    by 0x8D9B257: dlopen_doit (dlopen.c:66)
==220709== 
==220709== LEAK SUMMARY:
==220709==    definitely lost: 384 bytes in 3 blocks
==220709==    indirectly lost: 1,230 bytes in 20 blocks
==220709==      possibly lost: 1,352 bytes in 18 blocks
==220709==    still reachable: 189,789 bytes in 1,437 blocks
==220709==                       of which reachable via heuristic:
==220709==                         stdstring          : 1,845 bytes in 46 blocks
==220709==                         newarray           : 1,536 bytes in 16 blocks
==220709==         suppressed: 12 bytes in 1 blocks
==220709== Reachable blocks (those to which a pointer was found) are not shown.
==220709== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==220709== 
==220709== For lists of detected and suppressed errors, rerun with: -s
==220709== ERROR SUMMARY: 21 errors from 21 contexts (suppressed: 0 from 0)


  


  

  • As of writing this I've failed to replicate the error I got before about when I get a seg fault. As of now whether or not I get a segfault or not I'm getting the same output as above.

  


  


  What could be the reason for this ? Am I setting ffmpeg wrong ?