Recherche avancée

Sur d’autres sites (9981)

• JPEG Image to AVFrame (ffmpeg)

  20 février 2014, par user3330252

  I'm currently working on a screen sharing like application and I need to compile a sequence of jpeg files (screenshots of the screen) to an mpeg file. After extensive searching,
  I found some similar questions that never got any replies, and the code used there is deprecated.

  I'm currently stuck with converting jpg images into AVFrames. I don't have any code to share since I'm not exactly sure how I should go about doing it. Any help, tips or code snippets are greatly appreciated.

  Thank you

  Edit : I don't really know why I'm being downvoted. If I missed a detail, or if I'm doing something wrong then please let me know as it'll only help me improve my questions in the future.

• overlay movie.mov over an image file using AVCONV OR FFMPEG

  6 février 2014, par user1087179

  I am trying to overlay transparent mov or flv over an image.

  I am open to both options using ffmpeg or avconv.

  here is my cmd :

  ffmpeg -i bg.png -i input.mov -vf \
  
  '[0:v]setpts=PTS-STARTPTS, pad=iw*2:ih[bg]; \
  
  [1:v]setpts=PTS-STARTPTS,scale=720:400[fg]; [bg][fg]overlay=w' -vf yadif -pix_fmt rgba     -y -vcodec qtrle -an output.mov

  I Get this :

  ffmpeg version 0.8.9-4:0.8.9-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
  
    built on Nov  9 2013 19:08:00 with gcc 4.6.3
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  Input #0, image2, from '/home/socialvideos/public_html/public/images/blue_bg.png':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: png, rgb24, 720x400, 25 tbr, 25 tbn, 25 tbc
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/home/socialvideos/public_html/actor/opening/1.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      creation_time   : 2014-01-22 18:12:38
  
    Duration: 00:00:09.28, start: 0.000000, bitrate: 119710 kb/s
  
      Stream #1.0(eng): Video: qtrle, bgra, 1280x720, 120236 kb/s, PAR 1280:1280 DAR 16:9, 25 fps, 25 tbr, 25 tbn, 25 tbc
  
      Metadata:
  
        creation_time   : 2014-01-22 18:12:38
  
      Stream #1.1(eng): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
  
      Metadata:
  
        creation_time   : 2014-01-22 18:12:38
  
      Stream #1.2(eng): Data: tmcd / 0x64636D74, 0 kb/s
  
      Metadata:
  
        creation_time   : 2014-01-22 18:12:47
  
  Incompatible pixel format 'rgba' for codec 'qtrle', auto-selecting format 'rgb24'
  
  [buffer @ 0x10cf8c0] w:1280 h:720 pixfmt:bgra
  
  [yadif @ 0x10c8980] mode:0 parity:-1 auto_enable:0
  
  [avsink @ 0x10c8400] auto-inserting filter 'auto-inserted scaler 0' between the filter 'Parsed filter 0 yadif' and the filter 'out'
  
  [yadif @ 0x10c8980] auto-inserting filter 'auto-inserted scaler 1' between the filter 'src' and the filter 'Parsed filter 0 yadif'
  
  [scale @ 0x10cc9a0] w:1280 h:720 fmt:bgra -> w:1280 h:720 fmt:yuv420p flags:0x4
  
  [scale @ 0x10cbdc0] w:1280 h:720 fmt:yuv420p -> w:1280 h:720 fmt:rgb24 flags:0x4
  
  Output #0, mov, to 'out.mov':
  
    Metadata:
  
      encoder         : Lavf53.21.1
  
      Stream #0.0(eng): Video: qtrle, rgb24, 1280x720 [PAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 tbn, 25 tbc
  
      Metadata:
  
        creation_time   : 2014-01-22 18:12:38
  
  Stream mapping:
  
    Stream #1.0 -> #0.0
  
  Press ctrl-c to stop encoding
  
  frame=    2 fps=  0 q=0.0 size=     654kB time=0.08 bitrate=66996.3kbits/s    
  
  frame=    5 fps=  4 q=0.0 size=    1213kB time=0.20 bitrate=49692.2kbits/s    
  
  frame=    8 fps=  4 q=0.0 size=    2068kB time=0.32 bitrate=52952.9kbits/s    
  
  frame=   10 fps=  4 q=0.0 size=    2826kB time=0.40 bitrate=57880.0kbits/s    
  
  frame=   12 fps=  4 q=0.0 size=    3621kB time=0.48 bitrate=61805.2kbits/s    
  
  frame=   14 fps=  4 q=0.0 size=    4433kB time=0.56 bitrate=64846.9kbits/s    
  
  frame=   17 fps=  4 q=0.0 size=    5598kB time=0.68 bitrate=67435.6kbits/s    
  
  frame=   19 fps=  4 q=0.0 size=    6368kB time=0.76 bitrate=68643.7kbits/s    
  
  frame=   21 fps=  4 q=0.0 size=    7145kB time=0.84 bitrate=69683.8kbits/s    
  
  frame=   23 fps=  4 q=0.0 size=    7901kB time=0.92 bitrate=70352.7kbits/s    
  
  frame=   26 fps=  4 q=0.0 size=    9179kB time=1.04 bitrate=72298.4kbits/s    
  
  frame=   28 fps=  4 q=0.0 size=    9743kB time=1.12 bitrate=71260.9kbits/s    
  
  frame=   30 fps=  4 q=0.0 size=   10562kB time=1.20 bitrate=72100.4kbits/s    
  
  frame=   32 fps=  4 q=0.0 size=   11375kB time=1.28 bitrate=72802.4kbits/s    
  
  frame=   34 fps=  4 q=0.0 size=   12162kB time=1.36 bitrate=73256.3kbits/s    
  
  frame=   37 fps=  4 q=0.0 size=   13404kB time=1.48 bitrate=74190.5kbits/s    
  
  frame=   39 fps=  4 q=0.0 size=   14080kB time=1.56 bitrate=73936.2kbits/s    
  
  frame=   41 fps=  4 q=0.0 size=   14763kB time=1.64 bitrate=73744.3kbits/s    
  
  frame=   44 fps=  4 q=0.0 size=   15690kB time=1.76 bitrate=73030.4kbits/s    
  
  frame=   47 fps=  4 q=0.0 size=   16660kB time=1.88 bitrate=72595.6kbits/s    
  
  frame=   49 fps=  4 q=0.0 size=   17418kB time=1.96 bitrate=72798.4kbits/s    
  
  frame=   51 fps=  4 q=0.0 size=   18060kB time=2.04 bitrate=72524.8kbits/s    
  
  frame=   54 fps=  4 q=0.0 size=   18805kB time=2.16 bitrate=71320.3kbits/s    
  
  frame=   56 fps=  4 q=0.0 size=   19498kB time=2.24 bitrate=71305.2kbits/s    
  
  frame=   58 fps=  4 q=0.0 size=   20178kB time=2.32 bitrate=71247.7kbits/s    
  
  frame=   60 fps=  4 q=0.0 size=   20892kB time=2.40 bitrate=71310.3kbits/s    
  
  frame=   63 fps=  4 q=0.0 size=   22028kB time=2.52 bitrate=71609.8kbits/s    
  
  frame=   65 fps=  4 q=0.0 size=   22729kB time=2.60 bitrate=71613.6kbits/s    
  
  frame=   68 fps=  4 q=0.0 size=   23827kB time=2.72 bitrate=71762.8kbits/s    
  
  frame=   71 fps=  4 q=0.0 size=   24865kB time=2.84 bitrate=71724.5kbits/s    
  
  frame=   74 fps=  4 q=0.0 size=   26029kB time=2.96 bitrate=72035.8kbits/s    
  
  frame=   76 fps=  4 q=0.0 size=   26746kB time=3.04 bitrate=72074.2kbits/s    
  
  frame=   79 fps=  4 q=0.0 size=   27642kB time=3.16 bitrate=71659.3kbits/s    
  
  frame=   82 fps=  4 q=0.0 size=   28743kB time=3.28 bitrate=71787.0kbits/s    
  
  frame=   85 fps=  4 q=0.0 size=   29929kB time=3.40 bitrate=72111.4kbits/s    
  
  frame=   87 fps=  4 q=0.0 size=   30602kB time=3.48 bitrate=72037.4kbits/s    
  
  frame=   89 fps=  4 q=0.0 size=   31242kB time=3.56 bitrate=71892.2kbits/s    
  
  frame=   92 fps=  4 q=0.0 size=   32091kB time=3.68 bitrate=71437.1kbits/s    
  
  frame=   95 fps=  4 q=0.0 size=   32972kB time=3.80 bitrate=71080.2kbits/s    
  
  frame=   98 fps=  4 q=0.0 size=   34038kB time=3.92 bitrate=71132.0kbits/s    
  
  frame=  101 fps=  4 q=0.0 size=   35037kB time=4.04 bitrate=71046.2kbits/s    
  
  frame=  104 fps=  4 q=0.0 size=   35901kB time=4.16 bitrate=70697.3kbits/s    
  
  frame=  107 fps=  4 q=0.0 size=   36980kB time=4.28 bitrate=70780.7kbits/s    
  
  frame=  109 fps=  4 q=0.0 size=   37800kB time=4.36 bitrate=71022.0kbits/s    
  
  frame=  111 fps=  4 q=0.0 size=   38488kB time=4.44 bitrate=71011.5kbits/s    
  
  frame=  114 fps=  4 q=0.0 size=   39415kB time=4.56 bitrate=70808.9kbits/s    
  
  frame=  117 fps=  4 q=0.0 size=   40404kB time=4.68 bitrate=70725.0kbits/s    
  
  frame=  119 fps=  4 q=0.0 size=   41076kB time=4.76 bitrate=70691.3kbits/s    
  
  frame=  121 fps=  4 q=0.0 size=   41885kB time=4.84 bitrate=70892.5kbits/s    
  
  frame=  123 fps=  4 q=0.0 size=   42622kB time=4.92 bitrate=70967.6kbits/s    
  
  frame=  125 fps=  4 q=0.0 size=   43368kB time=5.00 bitrate=71054.0kbits/s    
  
  frame=  127 fps=  4 q=0.0 size=   44161kB time=5.08 bitrate=71214.6kbits/s    
  
  frame=  130 fps=  4 q=0.0 size=   45070kB time=5.20 bitrate=71002.5kbits/s    
  
  frame=  132 fps=  4 q=0.0 size=   45782kB time=5.28 bitrate=71032.2kbits/s    
  
  frame=  134 fps=  4 q=0.0 size=   46599kB time=5.36 bitrate=71220.3kbits/s    
  
  frame=  136 fps=  4 q=0.0 size=   47270kB time=5.44 bitrate=71183.8kbits/s    
  
  frame=  138 fps=  4 q=0.0 size=   47865kB time=5.52 bitrate=71034.5kbits/s    
  
  frame=  140 fps=  4 q=0.0 size=   48449kB time=5.60 bitrate=70874.3kbits/s    
  
  frame=  142 fps=  4 q=0.0 size=   49013kB time=5.68 bitrate=70689.4kbits/s    
  
  frame=  144 fps=  4 q=0.0 size=   49613kB time=5.76 bitrate=70560.8kbits/s    
  
  frame=  147 fps=  4 q=0.0 size=   50683kB time=5.88 bitrate=70610.9kbits/s    
  
  frame=  149 fps=  4 q=0.0 size=   51231kB time=5.96 bitrate=70417.5kbits/s    
  
  frame=  151 fps=  4 q=0.0 size=   51734kB time=6.04 bitrate=70166.0kbits/s    
  
  frame=  153 fps=  4 q=0.0 size=   52097kB time=6.12 bitrate=69734.9kbits/s    
  
  frame=  155 fps=  4 q=0.0 size=   52591kB time=6.20 bitrate=69487.4kbits/s    
  
  frame=  157 fps=  4 q=0.0 size=   53374kB time=6.28 bitrate=69624.1kbits/s    
  
  frame=  159 fps=  4 q=0.0 size=   54086kB time=6.36 bitrate=69665.9kbits/s    
  
  frame=  161 fps=  4 q=0.0 size=   54805kB time=6.44 bitrate=69715.3kbits/s    
  
  frame=  163 fps=  4 q=0.0 size=   55574kB time=6.52 bitrate=69826.0kbits/s    
  
  frame=  166 fps=  4 q=0.0 size=   56683kB time=6.64 bitrate=69932.4kbits/s    
  
  frame=  168 fps=  4 q=0.0 size=   57421kB time=6.72 bitrate=69999.1kbits/s    
  
  frame=  170 fps=  4 q=0.0 size=   58230kB time=6.80 bitrate=70150.4kbits/s    
  
  frame=  173 fps=  4 q=0.0 size=   59357kB time=6.92 bitrate=70268.0kbits/s    
  
  frame=  176 fps=  4 q=0.0 size=   60482kB time=7.04 bitrate=70378.7kbits/s    
  
  frame=  179 fps=  4 q=0.0 size=   61346kB time=7.16 bitrate=70187.7kbits/s    
  
  frame=  181 fps=  4 q=0.0 size=   62171kB time=7.24 bitrate=70345.9kbits/s    
  
  frame=  184 fps=  4 q=0.0 size=   63299kB time=7.36 bitrate=70454.0kbits/s    
  
  frame=  186 fps=  4 q=0.0 size=   64031kB time=7.44 bitrate=70502.6kbits/s    
  
  frame=  188 fps=  4 q=0.0 size=   64701kB time=7.52 bitrate=70482.4kbits/s    
  
  frame=  191 fps=  4 q=0.0 size=   65731kB time=7.64 bitrate=70479.9kbits/s    
  
  frame=  194 fps=  4 q=0.0 size=   66823kB time=7.76 bitrate=70543.2kbits/s    
  
  frame=  197 fps=  4 q=0.0 size=   67568kB time=7.88 bitrate=70243.5kbits/s    
  
  frame=  200 fps=  4 q=0.0 size=   68378kB time=8.00 bitrate=70018.6kbits/s    
  
  frame=  203 fps=  4 q=0.0 size=   69112kB time=8.12 bitrate=69724.5kbits/s    
  
  frame=  205 fps=  4 q=0.0 size=   69872kB time=8.20 bitrate=69804.1kbits/s    
  
  frame=  207 fps=  4 q=0.0 size=   70548kB time=8.28 bitrate=69798.2kbits/s    
  
  frame=  210 fps=  4 q=0.0 size=   71469kB time=8.40 bitrate=69699.4kbits/s    
  
  frame=  213 fps=  4 q=0.0 size=   72386kB time=8.52 bitrate=69599.5kbits/s    
  
  frame=  216 fps=  4 q=0.0 size=   73281kB time=8.64 bitrate=69480.8kbits/s    
  
  frame=  219 fps=  4 q=0.0 size=   74241kB time=8.76 bitrate=69427.7kbits/s    
  
  frame=  222 fps=  4 q=0.0 size=   75010kB time=8.88 bitrate=69198.2kbits/s    
  
  frame=  225 fps=  4 q=0.0 size=   75861kB time=9.00 bitrate=69050.0kbits/s    
  
  frame=  227 fps=  4 q=0.0 Lsize=   76442kB time=9.08 bitrate=68966.0kbits/s    
  
  video:76439kB audio:0kB global headers:0kB muxing overhead 0.003299%

  However the video generated does not have background image and have white color instead. please help..

• Long Overdue MediaWiki Upgrade

  5 février 2014, par Multimedia Mike — General

  What do I do ? What I do ? This library book is 42 years overdue !
  I admit that it’s mine, yet I can’t pay the fine,
  Should I turn it in or should I hide it again ?
  What do I do ? What do I do ?

  I internalized the forgoing paean to the perils of procrastination by Shel Silverstein in my formative years. It’s probably why I’ve never paid a single cent in late fees in my entire life.

  However, I have been woefully negligent as the steward of the MediaWiki software that drives the world famous MultimediaWiki, the internet’s central repository of obscure technical knowledge related to multimedia. It is currently running of version 1.6 software. The latest version is 1.22.

  The Story So Far
  According to my records, I first set up the wiki late in 2005. I don’t know which MediaWiki release I was using at the time. I probably conducted a few upgrades in the early days, but that went by the wayside perhaps in 2007. My web host stopped allowing shell access and the MediaWiki upgrade process pretty much requires running a PHP script from a command line. Upgrade time came around and I put off the project. Weeks turned into months turned into years until, according to some notes, the wiki abruptly stopped working in July, 2011. Suddenly, there were PHP errors about “Namespace” being a reserved word.

  While I finally laid out a plan to upgrade the wiki after all these years, I eventually found that the problem had been caused when my webhost upgraded from PHP 5.2 -> 5.3. I also learned of a small number of code changes that caused the problem to go away, thus kicking the can down the road once more.

  Then a new problem showed up last week. I think it might be related to a new version of PHP again. This time, a few other things on my site broke, and I learned that my webhost now allows me to select a PHP version to use (with the version then set to “auto”, which didn’t yield much information). Rolling back to an earlier version of PHP might have solved the problem easily.

  But NO ! I made the determination that this goes no further. I want this wiki upgraded.

  The Arduous Upgrade Path
  There are 2 general upgrade paths I can think of :
  

  1. Upgrade in place on the server
  2. Upgrade offline and put the site back on the server

  Approach #1 is problematic since I don’t have direct shell access, though I considered using something like PHP Shell. Approach #2 involves getting the entire set of wiki files and a backup of the MySQL tables. This is workable since I keep automated backups of these items anyway.

  In fairly short order, I was able to set up a working copy of the MultimediaWiki hosted on a local Linux machine. Now what’s the move ? The MediaWiki software I’m running is 1.6.10. The very latest, as of this upgrade project is 1.22.2. I suppose it’s way too much to hope that the software will upgrade cleanly from 1.6.x straight to 1.22.x, but I guess it’s worth a shot…

  HA ! No chance. Okay, next idea is to march through the various versions and upgrade each in turn. MediaWiki has all their historic releases online, all the way back to the 1.3 lineage. I decided that the latest of each lineage should upgrade cleanly from anything in the previous version of lineage. E.g., 1.6.10 should upgrade cleanly to 1.7.3 (last in the 1.7 series). This seemed to be a workable strategy. So I downloaded the latest of each series, unpacked, and copied all the wiki files over the working installation and ran ‘php update.php’ in the maintenance/ directory.

  The process is tedious and not without its obstacles. I consider this penance for my years of wiki neglect. First, I run into the “PHP Parse error : syntax error, unexpected T_NAMESPACE, expecting T_STRING” issue, the same that I saw years ago after the webhost transitioned from PHP 5.2 -> 5.3. I could solve this by editing assorted files and changing “Namespace” -> “MWNamespace” (which is what MediaWiki did by version 1.13). But I would prefer not to.

  Instead, I downloaded the source for PHP 5.2 and compiled it in a separate directory, then called ‘/path/to/php/5.2/bin/php update.php’. Problem solved.

  The next problem is that a bunch of the database update scripts are specifying “Type=InnoDB”. This isn’t supported by modern MySQL databases. Now, it’s “Engine=InnoDB”. A quick search & replace at the command line fixes this for 1.6.x… and 1.7.x… and 1.8 through 1.12. Finally, at 1.13, it was no longer necessary. As a bonus, at 1.13, I was able to test the installation since Namespace had been renamed to MWNamespace. I would later learn that the table type modifications probably could have been simplified in by changing “$wgDBmysql4 = true ;” to “$wgDBmysql5 = true ;” somewhere in LocalSettings.php.

  Command line upgrading worked smoothly up through 1.18 series when I got a new syntax error :

  <br />
PHP Fatal error:  Call to a member function addMessages() on a non-object in /mnt/sdb1/archive/wiki/extensions/Cite.php on line 68<br />

  Best I could do was comment out that line. I hope that doesn’t break anything important.

  In the home stretch, the very last transition (1.21 -> 1.22) failed :

  PHP Fatal error :  Cannot redeclare wfProfileIn() (previously declared in 
  /mnt/sdb1/archive/wiki/includes/profiler/Profiler.php:33) in 
  /mnt/sdb1/archive/wiki/includes/ProfilerStub.php on line 25
  

  Apparently, this problem arises occasionally since 1.18. I found a way around it thanks to this page : Deleted the file StartProfiler.php. Who am I to argue ?

  Upon completing the transition to 1.22, the wiki doesn’t look correct– the pictures aren’t showing up. The solution was to fix the temporary directory via LocalSettings.php.

  Back To Production
  Okay, it all works again ! Locally, that is. How to get it back to the server ? My first idea was that, knowing that this upgrade process can succeed, try stepping through the upgrade process again, but tell the update.php scripts to access the database tables on multimedia.cx. This seemed to be working for awhile, even though the database update phase often took 4-5 minutes. However, the transition from 1.8.5 -> 1.9.6 took 75 minutes and then timed out. According to my notes, “This isn’t going to work.”

  The new process :

  1. Dump the database tables from the local database.
  2. Create a new database remotely (melanson_wiki_ng).
  3. Dump the database table into melanson_wiki_ng.
  4. Move the index.php file out of the wiki files directory temporarily (or rename).
  5. Modify the LocalSettings.php to talk to the new database.
  6. Perform a lftp mirror operation in order to send all the files up to the server.
  7. Send the index.php file and hope beyond hope that everything magically works.

  And that’s the story of how the updated MultimediaWiki came back online. Despite the database dump file being over 110 MB, it only tool MySQL 1m45s to transmit it all to the remote server (let’s hear it for the ‘–compress’ option). For comparison, inserting the tables back into a fresh local database took 1m07s.

  When the MultimediaWiki was first live again, it loaded, but ever so slowly. This is when I finally looked into optimization and found that I was lacking any caching. So as a bonus, the MultimediaWiki should be much faster now.

  Going Forward
  For all I know, I did everything described here in the hardest way possible. But at least I got it done. Unless I learn of a better process, future upgrades will probably look similar to this.

  Additionally, I should probably take some time to figure out what new features are part of the standard MediaWiki distribution nowadays.