Recherche avancée

Sur d’autres sites (6465)

• ffmpeg for Android build shows error

  2 avril 2015, par Jamal

  I would like to build ffmpeg for Android so I am following a steps from this tutorial http://www.roman10.net/how-to-build-ffmpeg-with-ndk-r9/

  What I tried

  1. downloaded android-ndk-r10d-darwin-x86_64.bin for Mac 64 bit OS
  2. decompressed/extract the NDK archieve file
  3. downloaded ffmpeg 2.6.1
  4. decompressed/extract the `ffmpeg 2.6.1 file
  5. copied the ffmpeg 2.6.1 extracted folder and pasted into android-ndk-r10d/sources/ location

  6. Opened the ffmpeg-2.6.1/configure file and replaced this code

     SLIBNAME_WITH_MAJOR=’$(SLIBNAME).$(LIBMAJOR)’
     LIB_INSTALL_EXTRA_CMD=’$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"’
     SLIB_INSTALL_NAME=’$(SLIBNAME_WITH_VERSION)’
     SLIB_INSTALL_LINKS=’$(SLIBNAME_WITH_MAJOR) $(SLIBNAME)’

  with

  SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
  
  LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
  
  SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
  
  SLIB_INSTALL_LINKS='$(SLIBNAME)'

  7.Created the build_android.shfile inside ffmpeg-2.6.1 folder so now it be like this ffmpeg-2.6.1/build_android.sh.
  instead of this NDK=$HOME/Desktop/adt/android-ndk-r9 line I set current NDK location
  8. executed this sudo chmod +x build_android.sh command

  9. while executing this command ./build_android.sh got below error

  Hubs-Mac-mini:ffmpeg-2.6.1 hubmaci7$ ./build_android.sh
  Configured with : —prefix=/Applications/Xcode.app/Contents/Developer/usr —with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/include/c++/4.2.1
  Configured with : —prefix=/Applications/Xcode.app/Contents/Developer/usr —with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/include/c++/4.2.1
  /hubmaci7/Pictures/Hubino/Jamal/android-ndk-r10d/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc is unable to create an executable file.
  C compiler test failed.

  If you think configure made a mistake, make sure you are using the latest
  
  version from Git.  If the latest version fails, report the problem to the
  
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "config.log" produced by configure as this will help
  
  solve the problem.
  
  Makefile:2: config.mak: No such file or directory
  
  Makefile:59: /common.mak: No such file or directory
  
  Makefile:100: /libavutil/Makefile: No such file or directory
  
  Makefile:100: /library.mak: No such file or directory
  
  Makefile:102: /doc/Makefile: No such file or directory
  
  Makefile:185: /tests/Makefile: No such file or directory
  
  make: *** No rule to make target `/tests/Makefile'.  Stop.
  
  Makefile:2: config.mak: No such file or directory
  
  Makefile:59: /common.mak: No such file or directory
  
  Makefile:100: /libavutil/Makefile: No such file or directory
  
  Makefile:100: /library.mak: No such file or directory
  
  Makefile:102: /doc/Makefile: No such file or directory
  
  Makefile:185: /tests/Makefile: No such file or directory
  
  make: *** No rule to make target `/tests/Makefile'.  Stop.
  
  Makefile:2: config.mak: No such file or directory
  
  Makefile:59: /common.mak: No such file or directory
  
  Makefile:100: /libavutil/Makefile: No such file or directory
  
  Makefile:100: /library.mak: No such file or directory
  
  Makefile:102: /doc/Makefile: No such file or directory
  
  Makefile:185: /tests/Makefile: No such file or directory
  
  make: *** No rule to make target `/tests/Makefile'.  Stop.
  
  Hubs-Mac-mini:ffmpeg-2.6.1 hubmaci7$ 

  please provide a needed solution for me to solve this errors

• How to decode h264 video encoded from yuv444p frames ?

  22 octobre 2015, par Bing Liu

  I had an h264 video stream encoded from yuv444p frames, it was played well using vlc or mpv player.

  But when I tried to decode it using libavcodec, it just looked like this.

  wrong result ;

  The source frame is an upsize down vlc-player logo.

  Here is the intialization of the decoder :

  AVCodec *codec = avcodec_find_decoder(AV_CODEC_ID_H264);
  
  AVCodecContext *codecCtx = avcodec_alloc_context3(codec);
  
  avcodec_open2(codecCtx, codec, NULL);

  The decoder worked well when decoding packets encoded from yuv420p.
  Did I miss anything when decoding those packets encoded from yuv444p frames ?

  Update：I converted the yuv444p output into BGRA with sws_scale(), then I make a transforment with the follow codes ;

  int offset_out = 0, offset_tmp = 0;
  
  uint32_t *tmp = (uint32_t *)malloc(width * height * 4);
  
  for (int i = 0; i < width * height; i++) { 
  
      if ((i + width + 9) % (width + 9) > width) {
  
          out[offset_out++] = in[i];
  
      } else {
  
          tmp[offset_tmp++] = in[i];
  
      }
  
  }
  
  memcpy(out + offset_out, tmp, offset_tmp);
  
  free(tmp);

  Then the picture looked all right.

  There is a number 9 in i + width + 9. I guessed that cause I knew the width and height of the source picture. But what if the width or height was changed to some value else, 9 didn’t work.

  I want to know what’s wrong with the decoder.

• How does Rust work with process arguments ?

  1er octobre 2022, par SoptikHa

  I'm really confused about Rust processes. I'm trying to call something like this :

  



  ffmpeg -i path/to/test-video.webm -ab 160k -ac 2 -vn -f mp3 -


  



  This should extract sound out of video and send it to stdout. So I've done this :

  



  let sound: std::process::Output = Command::new("ffmpeg")
    .arg(format!("-i {}", args.input.to_str().unwrap()))
    .arg("-ab 160k")
    .arg("-ac 2")
    .arg("-vn")
    .arg("-f mp3")
    .arg("-")
    .stdout(Stdio::piped())
    .stdin(Stdio::inherit())
    .stderr(Stdio::inherit())
    .output()
    .unwrap();


  



  But for some reason, this doesn't work. It prints this to stderr :

  



  Unrecognized option 'i path/to/test-video.webm'.
Error splitting the argument list: Option not found


  



  When I remove the slashes from args (so it looks like .arg(format!("i {}", ...)).arg("ab 160k")..., I get this :

  



  Output file #0 does not contain any stream


  



  I think I misunderstood how this works, but I tested it on other applications and it seemed to work the way I'm doing it now. What did I miss, how does Rust work with these arguments ?

  



  And just to be clear, I know about the ffmpeg crates, but they don't work for me for some reason, I can't even compile them.