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• ffmpeg - Making a Clean WAV file

  10 janvier 2021, par Edward

  I'm looking to batch convert a number of files to audio files using ffmpeg for a game called Star Wars: Jedi Knight: Dark Forces II. The problem I'm having is that ffmpeg seems to be doing something that does so that Jedi Knight can't play the sound file.

  



  Jedi Knight accepts plain old PCM WAV files of various ranges, from 5khz to 96khz, 8 and 16 bit, mono and stereo. This sounds plain and simple. Except for that if one were to create a WAV file using MS Sound Recorder, Jedi Knight could not play it. Speculation was that it added something extra to header or something. But it can play a WAV file created by Audacity, GoldWave or ModPlug Tracker to name a few.

  



  So why not ffmpeg ? Am I using the wrong codec or params ? I took an original sound file from the game and performed the following :

  



  ffmpeg -i "orig_thrmlpu2.wav" -f wav -acodec pcm_s16le -ar 22050 -ac 1 "ffmpeg_thrmlpu2.wav"


  



  The ffmpeg version does not play in the game. ffprobe shows that the ffmpeg version has some Metadata which the original doesn't have. What params should I use to try and get the same WAV format as the original ? Mind you, -ar, -ac and bits aren't the important parts.

  



  Here are the files for you to examine : http://www.edwardleuf.org/Games/JK/thrmlpu2.zip

  


• Intercept and divert graphic output before it hits the linux framebuffer, not using X11

  13 octobre 2018, par Apollo

  I have been researching this issue for about a week, and it may be that I don’t know the right questions to ask.

  I am running a debian distro (Raspbian Stretch on the RaspberryPi). I am not using X11. Instead, I am booting straight to the command line, and will eventually probably boot straight up headless, starting a program at startup or sshing in to interact.

  What I need to do is to start an application (a game engine specifically) that draws graphics to the framebuffer. Then, I need to intercept that stream before it makes it into the framebuffer, so I can work with it in real time.

  Ultimately, I am using ffmpeg to compress and stream video of the output to another Pi. So, I want to be able to start an application and stream its output over a LAN, while still being able to interact with the command line in a separate thread.

  I have the ffmpeg command to pull from /dev/fb0, and have successfully started the graphics application and streamed the content. But, is there anyway to intercept, capture, or redirect that application’s output so it never actually hits the framebuffer ? In my searching I have found many examples of writing to or reading from the framebuffer, but nothing about stopping content before it reaches the buffer.

  I am happy with any solution that uses an existing package or application, or for C or RUST code that accomplishes what I need.

  Thank you

• ffmpeg command validation exception

  24 septembre 2018, par sudarshan

  hii i am new in using ffmpeg. i am using this to compress video files from mobile. i used command to compress is-

  ffmpeg -y -i %s -strict experimental -s 640x480 -r 30 -aspect 4:3 -ab 48000 -ac 2 -ar 22050 -b 2097k %s

  now above command works fine but compressed videos not work web browser(firefox).
  i tried using codec for large platform support as follows-

  ffmpeg -y -i %s -vcodec h264 -acodec aac -strict experimental -s 640x480 -r 30 -aspect 4:3 -ab 48000 -ac 2 -ar 22050 -b 2097k %s

  but it gives me command validation exception.my log cat is as follows-

  09-23 16:43:00.856 14252-14252/com.myproject  D/ffmpeg4android: /storage/emulated/0/VideoCompressor/Compressed Videos/VIDEO_20180918_202815.mp4 length in bytes: 2127662
  
      09-23 16:43:00.857 14252-14252/com.myproject  I/ffmpeg4android: checkForPermissions() called
  
      09-23 16:43:00.858 14252-14252/com.myprojects I/ffmpeg4android: permission already granted
  
      09-23 16:43:00.862 14252-16755/com.myprojects I/ffmpeg4android: doInBackground started...
  
      09-23 16:43:00.863 14252-16755/com.myprojects I/ffmpeg4android: vk deleted: false
  
      09-23 16:43:00.867 14252-16755/com.myprojects D/ffmpeg4android: Acquire wake lock
  
      09-23 16:43:00.871 14252-16755/com.myprojects I/ffmpeg4android: running ffmpeg4android_lib: 25.24.09
  
      09-23 16:43:00.872 14252-16755/com.myprojects D/ffmpeg4android: {"ffmpeg","-y","-i","/storage/emulated/0/VideoCompressor/Compressed","Videos/VIDEO_20180918_202815.mp4","-vcodec","h264","-acodec","aac","-strict","experimental","-s","640x480","-r","30","-aspect","4:3","-ab","48000","-ac","2","-ar","22050","-b","2097k","/storage/emulated/0/wiki_compressed/Wiki__COMP_VID20180923_164246.mp4"}
  
      09-23 16:43:00.874 14252-16755/com.myprojects D/ffmpeg4android: /storage/emulated/0/VideoCompressor/Compressed length in bytes: 0
  
      09-23 16:43:00.874 14252-16755/com.myprojects E/ffmpeg4android: Command validation failed.
  
      Check if input file exists: /storage/emulated/0/VideoCompressor/Compressed
  
      09-23 16:43:00.875 2684-5501/? V/WindowManager: Relayout Window{f7b8a8ed0 u0 com.myprojects/com.myprojects.ActivityProductListing}: viewVisibility=0 req=720x1280 WM.LayoutParams{(0,0)(fillxfill) sim=#112 ty=1 fl=#81810100 wanim=0x103046f vsysui=0x600 needsMenuKey=2 naviIconColor=0}
  
      09-23 16:43:00.876 14252-16755/com.myprojects E/ffmpeg4android: vk run exeption.
  
      com.netcompss.ffmpeg4android.CommandValidationException
  
      at com.netcompss.loader.LoadJNI.run(LoadJNI.java:39)
  
      at com.netcompss.loader.LoadJNI.run(LoadJNI.java:55)
  
      at com.wikireviews.custom.CompressVideoTask.doInBackground(CompressVideoTask.java:58)
  
      at com.wikireviews.custom.CompressVideoTask.doInBackground(CompressVideoTask.java:16)
  
      at android.os.AsyncTask$2.call(AsyncTask.java:305)
  
      at java.util.concurrent.FutureTask.run(FutureTask.java:237)
  
      at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
  
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
  
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
  
      at java.lang.Thread.run(Thread.java:762)
  
      09-23 16:43:00.876 2142-2142/? I/SurfaceFlinger: id=2473 createSurf (720x1280),1 flag=404, com.myprojects/com.myprojects.ActivityProductListing
  
      09-23 16:43:00.878 2684-5501/? V/Surface: sf_framedrop debug : 0x4f4c, game : false, logging : 0
  
      09-23 16:43:00.879 14252-16755/com.myprojects I/ffmpeg4android: doInBackground finished
  
      09-23 16:43:00.883 14252-14252/com.myprojects V/Surface: sf_framedrop debug : 0x4f4c, game : false, logging : 0
  
      09-23 16:43:00.884 14252-14252/com.myprojects D/ViewRootImpl@cc3ec53[ActivityProductListing]: Relayout returned: oldFrame=[0,0][720,1280] newFrame=[0,0][720,1280] result=0x7 surface={isValid=true 2107009024} surfaceGenerationChanged=true
  
      mHardwareRenderer.initialize() mSurface={isValid=true 2107009024} hwInitialized=true