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• Releasing GME Players and Tools

  22 mai 2012, par Multimedia Mike — General, alsa, github, gme, pulseaudio, Python, sdl

  I just can’t stop living in the past. To that end, I’ve been playing around with the Game Music Emu (GME) library again. This is a software library that plays an impressive variety of special music files extracted from old video games.

  I have just posted a series of GME tools and associated utilities up on Github.

  Clone the repo and try them out. The repo includes a small test corpus since one of the most tedious parts about playing these files tends to be tracking them down in the first place.

  Players
  At first, I started with trying to write some simple command line audio output programs based on GME. GME has to be the simplest software library that it has ever been my pleasure to code against. All it took was a quick read through the gme.h header file and it was immediately obvious how to write a simple program.

  First, I wrote a command line tool that output audio through PulseAudio on Linux. Then I made a second program that used ALSA. Guess what I learned through this exercise ? PulseAudio is actually far easier to program than ALSA.

  I also created an SDL player, seen in my last post regarding how to write an oscilloscope. I think I have the A/V sync correct now. It’s a little more fun to use than the command line tools. It also works on non-Linux platforms (tested at least on Mac OS X).

  Utilities
  I also wrote some utilities. I’m interested in exporting metadata from these rather opaque game music files in order to make them a bit more accessible. To that end, I wrote gme2json, a program that uses the GME library to fetch data from a game music file and then print it out in JSON format. This makes it trivial to extract the data from a large corpus of game music files and work with it in many higher level languages.

  Finally, I wrote a few utilities that repack certain ad-hoc community-supported game music archives into... well, an ad-hoc game music archive of my own device. Perhaps it’s a bit NIH syndrome, but I don’t think certain of these ad-hoc community formats were very well thought-out, or perhaps made sense a decade or more ago. I guess I’m trying to bring a bit of innovation to this archival process.

  Endgame
  I haven’t given up on that SaltyGME idea (playing these game music files directly in a Google Chrome web browser via Google Chrome). All of this ancillary work is leading up to that goal.

  Silly ? Perhaps. But I still think it would be really neat to be able to easily browse and play these songs, and make them accessible to a broader audience.

• ffmpeg convert mov file to mp4 for HTML5 video tag IE9

  27 septembre 2016, par Adidi

  I looked everywhere here and on google - there is no valid command that works for IE9.
  some how IE9 is missing something.
  All that I tried worked everywhere else : chrome,safari,mobile device etc...
  I want one command that will convert it and I can use it in every device suppose to support mp4 in HTML5 video tag.

  I use this commands :

  ffmpeg -i movie.mov -vcodec copy -acodec copy out.mp4
  
  ffmpeg -i movie.mov -vcodec libx264 -vprofile high -preset slow -b:v 500k -maxrate 500k -bufsize 1000k -vf scale=-1:480 -threads 0 -acodec libvo_aacenc -b:a 128k -pix_fmt yuv420p outa.mp4
  
  ffmpeg -i movie.mov -b:V 1500k -vcodec libx264 -preset fast -g 30 adel.mp4
  
  ffmpeg -i movie.mov -acodec aac -strict experimental -ac 2 -ab 160k -vcodec libx264 -preset slow -f mp4 -crf 22 lamlam.mp4
  
  ffmpeg -i movie.mov -acodec aac -strict experimental -ac 2 -ab 160k -vcodec libx264 -preset slow -profile:v baseline -level 30 -maxrate 10000000 -bufsize 10000000 -f mp4 -threads 0 adiel.mp4

  etc.. again all this commands produce a valid mp4 file which works on chrome,safari etc... and works even when I launch them in windows itself using window media player.
  When I put this file in the video tag (I am using http://videojs.com/) in IE9 it isn’t working !

  <div class="vidoco-content" style="margin-top: 20px;">
  
  <video class="video-js vjs-default-skin vidoco-center" controls="controls" preload="none" width="600" height="400" poster="&lt;?php echo(DOMAIN); ?>static/test.jpg">
  
      <source src="&lt;?php echo(DOMAIN); ?>static/out.mp4" type="video/mp4"></source>
  
  </video>
  
  </div>

  If I use the software miro video converter to convert the same mov file to mp4 - it converted fine and I can play it in IE9 !
  miro converter is also using embedd ffmpeg inside it so I am sure it’s only a metter of the right ffmpeg command and parameters.
  In my apache htaccess I set the correct mime types for my files and I see it indeed correct when looking in IE developer tools :

  AddType audio/aac .aac
  
  AddType audio/mp4 .mp4 .m4a
  
  AddType audio/mpeg .mp1 .mp2 .mp3 .mpg .mpeg
  
  AddType audio/ogg .oga .ogg
  
  AddType audio/wav .wav
  
  AddType audio/webm .webm
  
  
  
  AddType video/mp4 .mp4 .m4v
  
  AddType video/ogg .ogv
  
  AddType video/webm .webm

  I am struggling with this for a long time so any help would be much appreciated.

  Thanks !

• FFmpeg stream giving me "Alsa" errors

  14 mars 2019, par Sherman B.

  Of late I have been trying different ways of telling my Raspberry Pi to send video to YouTube live stream. One of the things I wanted to be able to do is boot the Pi up, and it automatically starts the live stream on its own. The advantages to this are huge (won’t have to tote around keyboard/mouse to start the stream, or have to ssh into the Pi to start the stream).

  Now what I did to accomplish this was to make a Python program that pipes the stream from my encoder(FFmpeg) directly to the stream. My goal was to make the program work, and then, set it to run automatically. But every time I run the file in my terminal this is my result :

  Traceback (most recent call last):
  
    File "stream.py", line 22, in <module>
  
      stream.stdin.close() 
  
  NameError: name 'stream' is not defined
  
  [h264 @ 0x19ed450] Could not find codec parameters for stream 0 (Video: h264, none): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  pi@raspberrypi:~ $ Input #0, h264, from 'pipe:':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: h264, none, 25 tbr, 1200k tbn, 50 tbc
  
  Unknown input format: 'alsa'
  
  </module>

  Now I think I can fix I can fix some of those errors, but the biggest thing that worries me there is : the fact that "alsa" is unknown. I installed "libsasound" which is supposed to make Alsa usable, but that clearly did not help.

  I am using Python 3.

  This is my syntax for this program :

  import subprocess 
  
  import picamera 
  
  import time 
  
  YOUTUBE="rtmp://a.rtmp.youtube.com/live2/" 
  
  KEY = ("MY PERSONAL ENCODER KEY") 
  
  stream_cmd = 'ffmpeg -f h264 -r 25 -i - -itsoffset 5.5 -fflags nobuffer -f alsa -ac 1 -i hw:1,0 -vcodec copy -acodec aac -ac 1 -ar 8000 -ab 32k -map 0:0 -map 1:0 -strict experimental -f flv ' + YOUTUBE + KEY 
  
  stream_pipe = subprocess.Popen(stream_cmd, shell=True, stdin=subprocess.PIPE) 
  
  camera = picamera.PiCamera(resolution=(640, 480), framerate=25) 
  
  try: 
  
    now = time.strftime("%Y-%m-%d-%H:%M:%S") 
  
    camera.framerate = 25 
  
    camera.vflip = True 
  
    camera.hflip = True 
  
    camera.start_recording(stream.stdin, format='h264', bitrate = 2000000) 
  
    while True: 
  
       camera.wait_recording(1) 
  
  except KeyboardInterrupt: 
  
       camera.stop_recording() 
  
  finally: 
  
    camera.close()
  
    stream.stdin.close() 
  
    stream.wait() 
  
    print("Camera safely shut down") 
  
    print("Good bye") 

  Now maybe I am missing something simple here, but I don’t know what. I have tried many ideas (e.g. replacing Alsa with some other input, naming the "stream" function.) I have no idea.