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• Should I just replace OpenAL, FreeImage, and FFMPEG with SFML ?

  15 juillet 2012, par SteveDeFacto

  I needed SFML for creating a window and getting input but I also noticed it can replace many other libraries I've been using such as OpenAL, FreeImage, and FFMPEG. The only thing is that FFMPEG can load video files. However, others have made extensions to SFML to allow it to load video files and FFMPEG feels like more of a burden than it's worth since to do anything with it is very complex and building the library as static seems incredibly difficult. Are there any reasons I should keep using these other libraries when SFML appears to support everything I need ?

• Program hangs while using ffprobe on file with teletext subtitles

  6 août 2012, par Jon

  Having a problem running ffprobe on an MKV file that contains teletext subtitles. Code is in a C# library and works fine for other MKV files.

  Running the latest :

  ffprobe -v
  
  
  
  ffprobe version N-42347-g299387e Copyright (c) 2007-2012 the FFmpeg developers
  
    built on Jul  8 2012 15:44:54 with gcc 4.7.1

  Code :

  string args = string.Format("-show_format -show_streams \"{0}\"", FileName);
  
  
  
  Process p = new Process();
  
  p.StartInfo = new ProcessStartInfo(FFPROBE_PATH);
  
  p.StartInfo.Arguments = args;
  
  p.StartInfo.CreateNoWindow = true;
  
  p.StartInfo.RedirectStandardOutput = true;
  
  p.StartInfo.RedirectStandardError = true;
  
  p.StartInfo.UseShellExecute = false;
  
  p.StartInfo.WorkingDirectory = System.IO.Directory.GetCurrentDirectory();
  
  p.Start();
  
  
  
  while (!p.HasExited)
  
  {
  
      System.Threading.Thread.Sleep(100);
  
  }
  
  
  
  string output = p.StandardOutput.ReadToEnd().Replace("\r\n", "\n");

  The filename has a UNC path - tried using the FileName parameter but got an error, hence passing the filename via the arguments.

  If I run the following commandline :

  ffprobe -show_format -show_streams "\192.168.10.1\content\Breakfast At Tiffany's sample preview.mkv"

  I get the following output (note the errors - "Unsupported codec with id ...") :

  ffprobe -show_format -show_streams "\\192.168.10.1\content\Breakfast At Tiffany's sample preview.mkv"
  
  
  
  ffprobe version N-42347-g299387e Copyright (c) 2007-2012 the FFmpeg developers
  
    built on Jul  8 2012 15:44:54 with gcc 4.7.1
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-fr
  
  ei0r --enable-libass --enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-li
  
  bmp3lame --enable-libnut --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libutv
  
  ideo --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --e
  
  nable-zlib
  
    libavutil      51. 64.100 / 51. 64.100
  
    libavcodec     54. 33.100 / 54. 33.100
  
    libavformat    54. 15.102 / 54. 15.102
  
    libavdevice    54.  1.100 / 54.  1.100
  
    libavfilter     3.  1.100 /  3.  1.100
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0. 15.100 /  0. 15.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  Input #0, matroska,webm, from 'c:\dev\content\Breakfast At Tiffany's sample preview.mkv':
  
    Metadata:
  
      creation_time   : 2011-12-14 21:27:01
  
    Duration: 00:01:02.77, start: 0.000000, bitrate: 4071 kb/s
  
      Stream #0:0: Video: h264 (High), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
  
      Metadata:
  
        title           : x264   1920x1080   Bitrate=4776 kbps   AvQuant=21.406   Rip by ShivaShanti
  
      Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1(side), s16, 448 kb/s (default)
  
      Metadata:
  
        title           : English Ac3 5.1 chnls 448 kbps
  
      Stream #0:2(ita): Audio: ac3, 48000 Hz, stereo, s16, 224 kb/s
  
      Metadata:
  
        title           : Italian Ac3 2.0 chnls 224  kbps
  
      Stream #0:3(eng): Subtitle: text (default)
  
      Metadata:
  
        title           : english
  
      Stream #0:4(ita): Subtitle: text
  
      Metadata:
  
        title           : italian
  
      Stream #0:5(dan): Subtitle: text
  
      Metadata:
  
        title           : danish
  
      Stream #0:6(dut): Subtitle: text
  
      Metadata:
  
        title           : dutch
  
      Stream #0:7(fin): Subtitle: text
  
      Metadata:
  
        title           : finnish
  
      Stream #0:8(fre): Subtitle: text
  
      Metadata:
  
        title           : french
  
      Stream #0:9(ger): Subtitle: text
  
      Metadata:
  
        title           : german
  
      Stream #0:10(nor): Subtitle: text
  
      Metadata:
  
        title           : norwegian
  
      Stream #0:11(spa): Subtitle: text
  
      Metadata:
  
        title           : spanish
  
      Stream #0:12(swe): Subtitle: text
  
      Metadata:
  
        title           : swedish
  
      Stream #0:13(eng): Subtitle: text
  
      Metadata:
  
        title           : english hearig impaired
  
  Unsupported codec with id 94210 for input stream 3
  
  Unsupported codec with id 94210 for input stream 4
  
  Unsupported codec with id 94210 for input stream 5
  
  Unsupported codec with id 94210 for input stream 6
  
  Unsupported codec with id 94210 for input stream 7
  
  Unsupported codec with id 94210 for input stream 8
  
  Unsupported codec with id 94210 for input stream 9
  
  Unsupported codec with id 94210 for input stream 10
  
  Unsupported codec with id 94210 for input stream 11
  
  Unsupported codec with id 94210 for input stream 12
  
  Unsupported codec with id 94210 for input stream 13
  
  [STREAM]
  
  index=0
  
  codec_name=h264
  
  codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
  
  profile=High
  
  codec_type=video
  
  codec_time_base=1001/48000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  width=1920
  
  height=1080
  
  has_b_frames=2
  
  sample_aspect_ratio=1:1
  
  display_aspect_ratio=16:9
  
  pix_fmt=yuv420p
  
  level=41
  
  timecode=N/A
  
  is_avc=1
  
  nal_length_size=4
  
  id=N/A
  
  r_frame_rate=24000/1001
  
  avg_frame_rate=24000/1001
  
  time_base=1/1000
  
  start_time=0.000000
  
  duration=N/A
  
  bit_rate=N/A
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  TAG:title=x264   1920x1080   Bitrate=4776 kbps   AvQuant=21.406   Rip by ShivaShanti
  
  [/STREAM]
  
  [STREAM]
  
  index=1
  
  codec_name=ac3
  
  codec_long_name=ATSC A/52A (AC-3)
  
  profile=unknown
  
  codec_type=audio
  
  codec_time_base=1/48000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  sample_fmt=s16
  
  sample_rate=48000
  
  channels=6
  
  bits_per_sample=0
  
  dmix_mode=-1
  
  ltrt_cmixlev=-1.000000
  
  ltrt_surmixlev=-1.000000
  
  loro_cmixlev=-1.000000
  
  loro_surmixlev=-1.000000
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/1000
  
  start_time=0.000000
  
  duration=N/A
  
  bit_rate=448000
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  TAG:language=eng
  
  TAG:title=English Ac3 5.1 chnls 448 kbps
  
  [/STREAM]
  
  [STREAM]
  
  index=2
  
  codec_name=ac3
  
  codec_long_name=ATSC A/52A (AC-3)
  
  profile=unknown
  
  codec_type=audio
  
  codec_time_base=1/48000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  sample_fmt=s16
  
  sample_rate=48000
  
  channels=2
  
  bits_per_sample=0
  
  dmix_mode=-1
  
  ltrt_cmixlev=-1.000000
  
  ltrt_surmixlev=-1.000000
  
  loro_cmixlev=-1.000000
  
  loro_surmixlev=-1.000000
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/1000
  
  start_time=0.000000
  
  duration=N/A
  
  bit_rate=224000
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  TAG:language=ita
  
  TAG:title=Italian Ac3 2.0 chnls 224  kbps
  
  [/STREAM]
  
  [STREAM]
  
  index=3
  
  codec_name=unknown
  
  codec_long_name=unknown
  
  profile=unknown
  
  codec_type=subtitle
  
  codec_time_base=1/1000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/1000
  
  start_time=0.000000
  
  duration=N/A
  
  bit_rate=N/A
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  TAG:language=eng
  
  TAG:title=english
  
  [/STREAM]
  
  [STREAM]
  
  index=4
  
  codec_name=unknown
  
  codec_long_name=unknown
  
  profile=unknown
  
  codec_type=subtitle
  
  codec_time_base=1/1000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/1000
  
  start_time=0.000000
  
  duration=N/A
  
  bit_rate=N/A
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  TAG:language=ita
  
  TAG:title=italian
  
  [/STREAM]
  
  [STREAM]
  
  index=5
  
  codec_name=unknown
  
  codec_long_name=unknown
  
  profile=unknown
  
  codec_type=subtitle
  
  codec_time_base=1/1000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/1000
  
  start_time=0.000000
  
  duration=N/A
  
  bit_rate=N/A
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  TAG:language=dan
  
  TAG:title=danish
  
  [/STREAM]
  
  [STREAM]
  
  index=6
  
  codec_name=unknown
  
  codec_long_name=unknown
  
  profile=unknown
  
  codec_type=subtitle
  
  codec_time_base=1/1000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/1000
  
  start_time=0.000000
  
  duration=N/A
  
  bit_rate=N/A
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  TAG:language=dut
  
  TAG:title=dutch
  
  [/STREAM]
  
  [STREAM]
  
  index=7
  
  codec_name=unknown
  
  codec_long_name=unknown
  
  profile=unknown
  
  codec_type=subtitle
  
  codec_time_base=1/1000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/1000
  
  start_time=0.000000
  
  duration=N/A
  
  bit_rate=N/A
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  TAG:language=fin
  
  TAG:title=finnish
  
  [/STREAM]
  
  [STREAM]
  
  index=8
  
  codec_name=unknown
  
  codec_long_name=unknown
  
  profile=unknown
  
  codec_type=subtitle
  
  codec_time_base=1/1000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/1000
  
  start_time=0.000000
  
  duration=N/A
  
  bit_rate=N/A
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  TAG:language=fre
  
  TAG:title=french
  
  [/STREAM]
  
  [STREAM]
  
  index=9
  
  codec_name=unknown
  
  codec_long_name=unknown
  
  profile=unknown
  
  codec_type=subtitle
  
  codec_time_base=1/1000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/1000
  
  start_time=0.000000
  
  duration=N/A
  
  bit_rate=N/A
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  TAG:language=ger
  
  TAG:title=german
  
  [/STREAM]
  
  [STREAM]
  
  index=10
  
  codec_name=unknown
  
  codec_long_name=unknown
  
  profile=unknown
  
  codec_type=subtitle
  
  codec_time_base=1/1000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/1000
  
  start_time=0.000000
  
  duration=N/A
  
  bit_rate=N/A
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  TAG:language=nor
  
  TAG:title=norwegian
  
  [/STREAM]
  
  [STREAM]
  
  index=11
  
  codec_name=unknown
  
  codec_long_name=unknown
  
  profile=unknown
  
  codec_type=subtitle
  
  codec_time_base=1/1000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/1000
  
  start_time=0.000000
  
  duration=N/A
  
  bit_rate=N/A
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  TAG:language=spa
  
  TAG:title=spanish
  
  [/STREAM]
  
  [STREAM]
  
  index=12
  
  codec_name=unknown
  
  codec_long_name=unknown
  
  profile=unknown
  
  codec_type=subtitle
  
  codec_time_base=1/1000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/1000
  
  start_time=0.000000
  
  duration=N/A
  
  bit_rate=N/A
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  TAG:language=swe
  
  TAG:title=swedish
  
  [/STREAM]
  
  [STREAM]
  
  index=13
  
  codec_name=unknown
  
  codec_long_name=unknown
  
  profile=unknown
  
  codec_type=subtitle
  
  codec_time_base=1/1000
  
  codec_tag_string=[0][0][0][0]
  
  codec_tag=0x0000
  
  id=N/A
  
  r_frame_rate=0/0
  
  avg_frame_rate=0/0
  
  time_base=1/1000
  
  start_time=0.000000
  
  duration=N/A
  
  bit_rate=N/A
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  TAG:language=eng
  
  TAG:title=english hearig impaired
  
  [/STREAM]
  
  [FORMAT]
  
  filename=c:\dev\content\Breakfast At Tiffany's sample preview.mkv
  
  nb_streams=14
  
  format_name=matroska,webm
  
  format_long_name=Matroska/WebM file format
  
  start_time=0.000000
  
  duration=62.776000
  
  size=31947628
  
  bit_rate=4071317
  
  TAG:creation_time=2011-12-14 21:27:01
  
  [/FORMAT]

  My problem is, the process appears to hang. I took out the 'CreateNoWindow' option and, of course, I get a big blank window onscreen that normally just flashs by on a normal file. With the teletext subtitle file however, it persists. If I manually close it, the program continues and I seem to get the output I want.

  So my question is, how can I debug this further, to find out why this is hanging and how to handle the error (or simply ignore it) and continue ?

• Methods For Retaining State

  26 décembre 2011, par Multimedia Mike — General, evernote, organization

  I jump around between projects. A lot. Over the years, I have employed various methods for retaining state or context as I switch to a different project. Here’s a quick survey and a general classification of their effectiveness.

  Good

  • Evernote : This is a cloud-based note-taking service that has a web client, Mac and Windows clients, and clients for just about ever mobile platform out there. I have an account and access it via the web interface as as the Windows, iOS, and Android clients. I really like it.

  
  
  

  Okay

  • Series of text files : I have been doing this for a very long time. I have many little note-filled directories here and there that are consistently migrated to new machines but generally forgotten about. This isn’t a terrible method but can be unwieldy when you work on lots of different machines. I’m still tracking down all these directories and importing them into Evernote.

  Bad

  • Layout of desktop windows : I have a habit of working on one project in a set of windows on one desktop space and another project in a second set of windows in another space, etc. Oh, this makes me shudder just thinking about it, mostly because of living in constant fear of a power failure or some other inadvertent reset (darn you, default config’d Windows Update) that wipes the state clean (sure, all of the work might have been saved, but I was relying on those windows to be set up in just the right manner to remind me of all the things I was working on). These days, I force myself to reboot at least once a week so I can’t get too deep into this habit. When it’s time to change projects, I write up exactly what I was doing and where I left off and stick it in Evernote.
  • Open browser windows : I guess it’s common to have many, many tabs open in one’s web browser in this day and age. Like many, I use open tabs as a stack of items to read. The state problem comes when a few of the open tabs represent TODO items. Then I start living in fear that the browser might crash or be restarted in an unexpected way and I struggle to recall what 3-5 important TODO items were that I had opened in separate tabs (on top of a stack of less important items). Again, I try to shut down the browser frequently in order to break this tendency. TODO items are better filed in Evernote.
  • Unsaved data in a text editor : Okay, this is just sloppy on my part, shoving temporary data into a text editor window thinking it’s supremely ephemeral. The problem comes when it’s linked to one of the many tasks on my desktop that might be bumped down a few priority levels ; when finally returning to the context-free data, I’m at a loss to explain what it’s for. Evernote gets it, once more, with a more thorough description of what was going on.
  • Email inbox : I make an effort to ensure that my email inbox has the fewest number of messages possible. Once things are dealt with, they get filed away elsewhere. This implies that things in my inbox require action. Some things have a habit of hanging around, though. Longer items now get described in better detail and filed away in Evernote.
  • Classic paper : Thanks to Derek in the comments for reminding me of this one. Paper is a reliable standby but it can get unwieldy when Post-It Notes litter your work area. Further, it can be problematic when you have multiple physical work areas.
  • Shell history : Another method I rely on entirely too often. This is when I count on a recipe of command line incantations living on in the history buffer of my Unix shell (generally Bash). What sequence of git commands allowed me to do XYZ ? Let’s check the shell history– I sure hope it’s still in there.

  Conclusion
  I guess what I’m trying to say here is that I really like Evernote. If you have similar troubles with retaining state, try it out. I hear there are many other services similar to it with slightly varying feature sets (people rave about Microsoft OneNote). So there are plenty of options and something out there is surely a fit.

  Evernote has a free tier and a premium tier. For my meager note-taking needs, I don’t come anywhere close to the free tier’s limit but I decided to pay for a premium subscription simply because I feel like I derive so much value from the service.

  One downside, however, is that I seem to be doing a lot less blogging since I got on Evernote earlier this year (though it is where I author most of these posts nowadays ; I especially like that I have a notebook labeled “Posted” whose incrementing count reminds me that I am getting some stuff out there). I originally started this blog as a sort of technical journal in order to organize notes and projects in a central location. It’s strange to think that if Evernote existed in 2005, I might never have had a reason to start this blog.