Recherche avancée

Sur d’autres sites (15539)

• Revisiting Nosefart and Discovering GME

  30 mai 2011, par Multimedia Mike — Game Hacking

  I found the following screenshot buried deep in an old directory structure of mine :

  
  
  

  I tried to recall how this screenshot came to exist. Had I actually created a functional KDE frontend to Nosefart yet neglected to release it ? I think it’s more likely that I used some designer tool (possibly KDevelop) to prototype a frontend. This would have been sometime in 2000.

  However, this screenshot prompted me to revisit Nosefart.

  Nosefart Background
  Nosefart is a program that can play Nintendo Sound Format (NSF) files. NSF files are files containing components that were surgically separated from Nintendo Entertainment System (NES) ROM dumps. These components contain the music playback engines for various games. An NSF player is a stripped down emulation system that can simulate the NES6502 CPU along with the custom hardware (2 square waves, 1 triangle wave, 1 noise generator, and 1 limited digital channel).

  Nosefart was written by Matt Conte and eventually imported into a Sourceforge project, though it has not seen any development since then. The distribution contains standalone command line players for Linux and DOS, a GTK frontend for the Linux command line version, and plugins for Winamp, XMMS, and CL-Amp.

  The Sourceforge project page notes that Nosefart is also part of XBMC. Let the record show that Nosefart is also incorporated into xine (I did that in 2002, I think).

  Upgrading the API
  When I tried running the command line version of Nosefart under Linux, I hit hard against the legacy audio API : OSS. Remember that ?

  In fairly short order, I was able to upgrade the CL program to use PulseAudio. The program is not especially sophisticated. It’s a single-threaded affair which checks for a keypress, processes an audio frame, and sends the frame out to the OSS file interface. All that was needed was to rewrite open_hardware() and close_hardware() for PA and then replace the write statement in play(). The only quirk that stood out is that including <pulse/pulseaudio.h> is insufficient for programming PA’s simple API. <pulse/simple.h> must be included separately.

  For extra credit, I adapted the program to ALSA. The program uses the most simplistic audio output API possible — just keep filling a buffer and sending it out to the DAC.

  Discovering GME
  I’m not sure what to do with the the program now since, during my research to attempt to bring Nosefart up to date, I became aware of a software library named Game Music Emu, or GME. It’s a pure C++ library that can essentially play any classic video game format you can possible name. Wow. A lot can happen in 10 years when you’re not paying attention.

  It’s such a well-written library that I didn’t need any tutorial or documentation to come up to speed. Just a quick read of the main gme.h header library enabled me in short order to whip up a quick C program that could play NSF and SPC files. Path of least resistance : Client program asks library to open a hardcoded file, synthesize 10 seconds of audio, and dump it into a file ; ask the FLAC command line program to transcode raw data to .flac file ; use ffplay to verify the results.

  I might develop some other uses for this library.

• FFMPEG : Stream a file with original playing rate

  21 novembre 2012, par sajad

  I want to stream a file to the network using ffmpeg in it's original frame rate ; so I can play the generated UDP stream using some receiver client such as VLC. I used this command :

  ffmpeg -i "myfile.mpg" -sameq -re -f mpegts "udp ://127.0.0.1:2000"

  By using this command the ffmpeg starts streaming the file in a very high rate ; such that streaming of a file that has about 30 minutes length, is finished after just about 40 secs. I want to see the file in original rate. Also I want to have control on rate of video to play it faster or slower. Is there any options to do this ? thank you.

• Playing videos using HTML5 Tag

  20 novembre 2012, par Haja Mohaideen

  I am creating a website where videos need to be streamed. The content creator uploads .mov file to the server. Upon uploading, I convert to the following formats using FFMPEG, .mp4, .webm, and .ogg.

  I am now trying to allow the video to be viewed from multiple browsers and handheld devices. The code is as follow :

  <code class="echappe-js">&lt;script&gt; <br />
  
  var video = document.getElementById(&amp;#39;video&amp;#39;);<br />
  
  video.addEventListener(&amp;#39;click&amp;#39;,function(){<br />
  
   video.play();<br />
  
   },false);<br />
  
  &lt;/script&gt;
  &lt;script type=&quot;text/javascript&quot; src=&quot;http://stackoverflow.com/feeds/tag/jwplayer.js&quot;&gt;&lt;/script&gt;
  
  &lt;script type=&quot;text/javascript&quot;&gt;<br />
  
    jwplayer(&quot;video&quot;).setup({<br />
  
      modes: [<br />
  
         { type: &amp;#39;html5&amp;#39; },<br />
  
         { type: &amp;#39;flash&amp;#39;, src: &amp;#39;player.swf&amp;#39; }<br />
  
      ]<br />
  
    });<br />
  
  &lt;/script&gt;
  

  The video works on all browsers. But, it is refusing to play on Android. When I click the play button, it shows as loading only.

  I am testing on 4.0.3.

  FFMPEG conversion codes :

  webm

  exec("ffmpeg -y -i file.mov -acodec libvorbis -ac 2 -ab 96k -ar 44100 -b 345k -s 640x360 output.webm", $command_output, $result);

  ogg

  exec("ffmpeg -y -i file.mov -acodec libvorbis -ac 2 -ab 96k -ar 44100 -b 345k -s 640x360 output.ogv", $command_output, $result);

  flv

  exec("ffmpeg -y -i file.mov -ar 44100 -ab 96 -f flv output.flv", $command_output, $result);

  For MP4 :

      sudo ffmpeg -i file.mov -s 320x240 -c:v libx264 -pix_fmt yuv420p -profile:v baseline -preset slow -acodec aac -strict experimental -ac 2 -r 15 -ab 44100 -aspect 16:9 output.mp4
  
  ffmpeg version git-2012-10-11-492b8ec Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Oct 11 2012 19:59:50 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --enable-gpl --enable-libfaac --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-version3
  
    libavutil      51. 74.100 / 51. 74.100
  
    libavcodec     54. 65.100 / 54. 65.100
  
    libavformat    54. 31.100 / 54. 31.100
  
    libavdevice    54.  3.100 / 54.  3.100
  
    libavfilter     3. 19.102 /  3. 19.102
  
    libswscale      2.  1.101 /  2.  1.101
  
    libswresample   0. 16.100 /  0. 16.100
  
    libpostproc    52.  1.100 / 52.  1.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x23f3220] Stream #1: not enough frames to estimate rate; consider increasing probesize
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x23f3220] Stream #2: not enough frames to estimate rate; consider increasing probesize
  
  Guessed Channel Layout for  Input Stream #0.1 : stereo
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      creation_time   : 2012-09-07 11:10:10
  
    Duration: 00:01:41.83, start: 0.000000, bitrate: 186917 kb/s
  
      Stream #0:0(eng): Video: qtrle (rle  / 0x20656C72), rgb24, 1920x1080, 185371 kb/s, SAR 1920:1920 DAR 16:9, 29.97 fps, 29.97 tbr, 30k tbn, 30k tbc
  
      Metadata:
  
        creation_time   : 2012-09-07 11:10:10
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 00:00:00;03
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s
  
      Metadata:
  
        creation_time   : 2012-09-07 11:10:10
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 00:00:00;03
  
      Stream #0:2(eng): Data: none (tmcd / 0x64636D74)
  
      Metadata:
  
        creation_time   : 2012-09-07 11:31:37
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 00:00:00;03
  
  File 'output.mp4' already exists. Overwrite ? [y/N] y
  
  using SAR=4/3
  
  [libx264 @ 0x240bf60] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX
  
  [libx264 @ 0x240bf60] profile Constrained Baseline, level 1.2
  
  [libx264 @ 0x240bf60] 264 - core 128 r2 198a7ea - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=0 ref=5 deblock=1:0:0 analyse=0x1:0x111 me=umh subme=8 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=1 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=15 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'output.mp4':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      encoder         : Lavf54.31.100
  
      Stream #0:0(eng): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 320x240 [SAR 4:3 DAR 16:9], q=-1--1, 15360 tbn, 15 tbc
  
      Metadata:
  
        creation_time   : 2012-09-07 11:10:10
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 00:00:00;03
  
      Stream #0:1(eng): Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 44 kb/s
  
      Metadata:
  
        creation_time   : 2012-09-07 11:10:10
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 00:00:00;03
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (qtrle -> libx264)
  
    Stream #0:1 -> #0:1 (pcm_s16le -> aac)
  
  Press [q] to stop, [?] for help
  
  frame=   25 fps=0.0 q=0.0 size=       0kB time=00:00:01.32 bitrate=   0.frame=   47 fps= 47 q=0.0 size=       0kB time=00:00:02.68 bitrate=   0.frame=   67 fps= 44 q=27.0 size=      12kB time=00:00:04.05 bitrate=  23frame=   88 fps= 44 q=27.0 size=      23kB time=00:00:05.41 bitrate=  34frame=  108 fps= 43 q=27.0 size=      35kB time=00:00:06.78 bitrate=  42frame=  128 fps= 42 q=27.0 size=      47kB time=00:00:08.14 bitrate=  47frame=  150 fps= 43 q=27.0 size=      64kB time=00:00:09.51 bitrate=  54frame=  172 fps= 43 q=27.0 size=      81kB time=00:00:10.88 bitrate=  61frame=  193 fps= 43 q=27.0 size=     106kB time=00:00:12.24 bitrate=  70frame=  214 fps= 42 q=27.0 size=     119kB time=00:00:13.61 bitrate=  71frame=  235 fps= 42 q=27.0 size=     127kB time=00:00:14.97 bitrate=  69frame=  254 fps= 42 q=27.0 size=     144kB time=00:00:16.34 bitrate=  72frame=  272 fps= 41 q=27.0 size=     157kB time=00:00:17.70 bitrate=  72frame=  289 fps= 41 q=27.0 size=     174kB time=00:00:19.07 bitrate=  74frame=  309 fps= 41 q=27.0 size=     183kB time=00:00:20.28 bitrate=  73frame=  329 fps= 41 q=27.0 size=     191kB time=00:00:20.77 bitrate=  75frame=  349 fps= 41 q=27.0 size=     200kB time=00:00:22.08 bitrate=  74frame=  369 fps= 41 q=27.0 size=     215kB time=00:00:23.38 bitrate=  75frame=  389 fps= 41 q=27.0 size=     225kB time=00:00:24.72 bitrate=  74frame=  408 fps= 40 q=27.0 size=     235kB time=00:00:26.02 bitrate=  74frame=  428 fps= 40 q=27.0 size=     247kB time=00:00:27.32 bitrate=  73frame=  448 fps= 40 q=27.0 size=     256kB time=00:00:28.65 bitrate=  73frame=  468 fps= 40 q=27.0 size=     264kB time=00:00:30.01 bitrate=  72frame=  489 fps= 40 q=27.0 size=     273kB time=00:00:31.38 bitrate=  71frame=  507 fps= 40 q=27.0 size=     299kB time=00:00:32.72 bitrate=  74frame=  527 fps= 40 q=27.0 size=     317kB time=00:00:34.09 bitrate=  76frame=  547 fps= 40 q=27.0 size=     336kB time=00:00:35.45 bitrate=  77frame=  565 fps= 40 q=27.0 size=     344kB time=00:00:36.82 bitrate=  76frame=  586 fps= 40 q=27.0 size=     352kB time=00:00:38.18 bitrate=  75frame=  607 fps= 40 q=27.0 size=     361kB time=00:00:39.55 bitrate=  74frame=  627 fps= 40 q=27.0 size=     370kB time=00:00:40.91 bitrate=  74frame=  647 fps= 40 q=27.0 size=     384kB time=00:00:42.28 bitrate=  74frame=  665 fps= 40 q=27.0 size=     408kB time=00:00:43.64 bitrate=  76frame=  684 fps= 40 q=27.0 size=     418kB time=00:00:45.01 bitrate=  76frame=  704 fps= 40 q=27.0 size=     427kB time=00:00:46.37 bitrate=  75frame=  721 fps= 40 q=27.0 size=     453kB time=00:00:47.74 bitrate=  77frame=  741 fps= 40 q=27.0 size=     463kB time=00:00:49.10 bitrate=  77frame=  761 fps= 40 q=27.0 size=     472kB time=00:00:50.47 bitrate=  76frame=  784 fps= 40 q=27.0 size=     481kB time=00:00:51.84 bitrate=  76frame=  804 fps= 40 q=27.0 size=     498kB time=00:00:53.20 bitrate=  76frame=  822 fps= 40 q=27.0 size=     518kB time=00:00:54.57 bitrate=  77frame=  843 fps= 40 q=27.0 size=     529kB time=00:00:55.93 bitrate=  77frame=  862 fps= 40 q=27.0 size=     547kB time=00:00:57.30 bitrate=  78frame=  882 fps= 40 q=27.0 size=     558kB time=00:00:58.13 bitrate=  78frame=  903 fps= 40 q=27.0 size=     568kB time=00:00:58.98 bitrate=  78frame=  923 fps= 40 q=27.0 size=     578kB time=00:01:00.35 bitrate=  78frame=  943 fps= 40 q=27.0 size=     588kB time=00:01:01.67 bitrate=  78frame=  964 fps= 40 q=27.0 size=     598kB time=00:01:03.06 bitrate=  77frame=  984 fps= 40 q=27.0 size=     607kB time=00:01:04.42 bitrate=  77frame= 1004 fps= 40 q=27.0 size=     626kB time=00:01:05.72 bitrate=  78frame= 1026 fps= 40 q=27.0 size=     638kB time=00:01:07.20 bitrate=  77frame= 1047 fps= 40 q=27.0 size=     655kB time=00:01:09.58 bitrate=  77frame= 1069 fps= 40 q=27.0 size=     670kB time=00:01:10.95 bitrate=  77frame= 1089 fps= 40 q=27.0 size=     691kB time=00:01:12.32 bitrate=  78frame= 1108 fps= 40 q=27.0 size=     710kB time=00:01:12.64 bitrate=  80frame= 1126 fps= 40 q=27.0 size=     731kB time=00:01:13.85 bitrate=  81frame= 1142 fps= 40 q=27.0 size=     759kB time=00:01:15.05 bitrate=  82frame= 1157 fps= 39 q=27.0 size=     787kB time=00:01:16.41 bitrate=  84frame= 1174 fps= 39 q=27.0 size=     796kB time=00:01:17.78 bitrate=  83frame= 1192 fps= 39 q=27.0 size=     806kB time=00:01:19.14 bitrate=  83frame= 1209 fps= 39 q=27.0 size=     821kB time=00:01:19.38 bitrate=  84frame= 1227 fps= 39 q=27.0 size=     831kB time=00:01:20.59 bitrate=  84frame= 1248 fps= 39 q=27.0 size=     840kB time=00:01:21.96 bitrate=  84frame= 1267 fps= 39 q=27.0 size=     848kB time=00:01:23.24 bitrate=  83frame= 1289 fps= 39 q=27.0 size=     857kB time=00:01:24.73 bitrate=  82frame= 1309 fps= 39 q=24.0 size=     877kB time=00:01:26.03 bitrate=  83frame= 1329 fps= 39 q=27.0 size=     892kB time=00:01:27.40 bitrate=  83frame= 1351 fps= 39 q=27.0 size=     901kB time=00:01:28.85 bitrate=  83frame= 1372 fps= 39 q=27.0 size=     912kB time=00:01:30.28 bitrate=  82frame= 1394 fps= 39 q=27.0 size=     925kB time=00:01:32.52 bitrate=  81frame= 1418 fps= 39 q=27.0 size=     936kB time=00:01:34.16 bitrate=  81frame= 1441 fps= 40 q=27.0 size=     947kB time=00:01:35.53 bitrate=  81frame= 1464 fps= 40 q=27.0 size=     957kB time=00:01:36.89 bitrate=  80frame= 1488 fps= 40 q=27.0 size=     969kB time=00:01:38.26 bitrate=  80frame= 1509 fps= 40 q=27.0 size=     981kB time=00:01:39.62 bitrate=  80frame= 1526 fps= 40 q=27.0 size=     993kB time=00:01:41.90 bitrate=  79frame= 1530 fps= 40 q=27.0 Lsize=    1038kB time=00:01:42.00 bitrate=  83.4kbits/s dup=0 drop=1522    
  
  video:406kB audio:590kB subtitle:0 global headers:0kB muxing overhead 4.258083%
  
  [libx264 @ 0x240bf60] frame I:15    Avg QP:16.30  size:  2928
  
  [libx264 @ 0x240bf60] frame P:1515  Avg QP:22.12  size:   245
  
  [libx264 @ 0x240bf60] mb I  I16..4: 72.9%  0.0% 27.1%
  
  [libx264 @ 0x240bf60] mb P  I16..4:  3.9%  0.0%  0.7%  P16..4:  3.2%  1.1%  0.5%  0.0%  0.0%    skip:90.5%
  
  [libx264 @ 0x240bf60] coded y,uvDC,uvAC intra: 12.1% 38.2% 14.8% inter: 1.2% 2.7% 0.9%
  
  [libx264 @ 0x240bf60] i16 v,h,dc,p: 29% 23%  4% 44%
  
  [libx264 @ 0x240bf60] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 16% 30%  6%  8%  8%  5%  6%  3%
  
  [libx264 @ 0x240bf60] i8c dc,h,v,p: 50% 27% 18%  5%
  
  [libx264 @ 0x240bf60] ref P L0: 80.0%  8.9%  6.1%  2.7%  2.3%
  
  [libx264 @ 0x240bf60] kb/s:32.58

  I decided to remote debug to see what is happening. I realised that the video status is pending.