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• FFmpeg : Choosing audio streams by language

  16 octobre 2017, par jdauthre

  I am trying to transcode tv streams but with only the english audio stream included. I have tried using the -map 0:m:language:eng stream specifier, but I get :

  "Automatic encoder selection failed for output stream #0:3. Default encoder for format mpegts (codec none) is probably disabled. Please choose an encoder manually.
  
  Error selecting an encoder for stream 0:3"

  This is despite including an encoder. I have tried all sorts of variations on this theme without success.

  Full output for one attempt is below :

  ffmpeg -i http://192.168.1.74:8001/1:0:1:189E:7FD:2:11A0000:0:0:0: -ignore_unknown -map 0:a -map 0:m:language:eng -map 0:v -acodec aac -vcodec libx264 -b:v 1100000 -t 00:00:30 "somethin.ts" 2>output.txt
  
  
  
      Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  [mpegts @ 03db7b60] Could not find codec parameters for stream 17 (Unknown: none ([11][0][0][0] / 0x000B)): unknown codec
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  [mpegts @ 03db7b60] Could not find codec parameters for stream 18 (Unknown: none ([11][0][0][0] / 0x000B)): unknown codec
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, mpegts, from 'http://192.168.1.74:8001/1:0:1:189E:7FD:2:11A0000:0:0:0:':
  
    Duration: N/A, start: 23690.732933, bitrate: N/A
  
    Program 6321 
  
    Program 6322 
  
    Program 6338 
  
    Program 6301 
  
    Program 6302 
  
      Stream #0:0[0x13ec]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1[0x13ee](NAR): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 224 kb/s
  
      Stream #0:2[0x13ed](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 224 kb/s
  
      Stream #0:3[0x13ef](eng,eng): Subtitle: dvb_teletext ([6][0][0][0] / 0x0006)
  
      Stream #0:4[0x13f0](eng): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
  
      Stream #0:5[0xf04]: Unknown: none ([5][0][0][0] / 0x0005)
  
      Stream #0:6[0xf03]: Unknown: none ([5][0][0][0] / 0x0005)
  
      Stream #0:7[0xf02]: Unknown: none ([5][0][0][0] / 0x0005)
  
      Stream #0:8[0xf01]: Unknown: none ([5][0][0][0] / 0x0005)
  
      Stream #0:9[0xf00]: Unknown: none ([5][0][0][0] / 0x0005)
  
      Stream #0:10[0x92a]: Unknown: none ([5][0][0][0] / 0x0005)
  
      Stream #0:11[0x913]: Unknown: none ([5][0][0][0] / 0x0005)
  
      Stream #0:12[0x912]: Unknown: none ([5][0][0][0] / 0x0005)
  
      Stream #0:13[0x911]: Unknown: none ([5][0][0][0] / 0x0005)
  
      Stream #0:14[0x919]: Unknown: none ([5][0][0][0] / 0x0005)
  
      Stream #0:15[0xf09]: Unknown: none ([11][0][0][0] / 0x000B)
  
      Stream #0:16[0xf08]: Unknown: none ([11][0][0][0] / 0x000B)
  
      Stream #0:17[0xf07]: Unknown: none ([11][0][0][0] / 0x000B)
  
      Stream #0:18[0xf06]: Unknown: none ([11][0][0][0] / 0x000B)
  
    Program 6318 
  
    Program 6390 
  
    Program 6391 
  
    Program 6351 
  
    Program 6361 
  
    Program 6306 
  
    Program 6341 
  
  Automatic encoder selection failed for output stream #0:3. Default encoder for format mpegts (codec none) is probably disabled. Please choose an encoder manually.
  
  Error selecting an encoder for stream 0:3

  Any ideas on how to do this. I cant specify streams by number as I want to use it for lots of tv streams and the order is often different.

  Thanks

• Stream map '0:4' matches no streams

  17 juillet 2022, par Hugh

  When concat vob files to mkv with -map 0:4 I get this error. if I replace it with -map 0:4 ? the output contains no subtitles because the subtitle track I want doesn't start until further into the file. If I include -map 0:3 I just get the wrong subtitle track.

  


  ffmpeg -version
ffmpeg version 5.0.1-Jellyfin Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 8 (Debian 8.3.0-6)
configuration: --prefix=/usr/lib/jellyfin-ffmpeg --target-os=linux --extra-libs=-lfftw3f --extra-version=Jellyfin --disable-doc --disable-ffplay --disable-ptx-compression --disable-shared --disable-libxcb --disable-sdl2 --disable-xlib --enable-lto --enable-gpl --enable-version3 --enable-static --enable-gmp --enable-gnutls --enable-chromaprint --enable-libdrm --enable-libass --enable-libfreetype --enable-libfribidi --enable-libfontconfig --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libdav1d --enable-libwebp --enable-libvpx --enable-libx264 --enable-libx265 --enable-libzvbi --enable-libzimg --enable-libfdk-aac --arch=amd64 --enable-libshaderc --enable-libplacebo --enable-vulkan --enable-opencl --enable-vaapi --enable-amf --enable-libmfx --enable-ffnvcodec --enable-cuda --enable-cuda-llvm --enable-cuvid --enable-nvdec --enable-nvenc
libavutil      57. 17.100 / 57. 17.100
libavcodec     59. 18.100 / 59. 18.100
libavformat    59. 16.100 / 59. 16.100
libavdevice    59.  4.100 / 59.  4.100
libavfilter     8. 24.100 /  8. 24.100
libswscale      6.  4.100 /  6.  4.100
libswresample   4.  3.100 /  4.  3.100
libpostproc    56.  3.100 / 56.  3.100


ffmpeg -analyzeduration 9000M -probesize 9000M -f concat -fflags +genpts -i mylist.txt -map 0:1 -map 0:2 -map 0:4? -metadata:s:s:0 language=eng -metadata:s:s:0 title="English" -c:s copy -c:v copy -c:a copy 'output.mkv'
...
Input #0, concat, from 'mylist.txt':
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Data: dvd_nav_packet
  Stream #0:1: Video: mpeg2video (Main), yuv420p(tv, top first), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn
    Side data:
      cpb: bitrate max/min/avg: 7000000/0/0 buffer size: 1835008 vbv_delay: N/A
  Stream #0:2: Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
  Stream #0:3: Subtitle: dvd_subtitle
Output #0, matroska, to 'output.mkv':
  Metadata:
    encoder         : Lavf59.16.100
  Stream #0:0: Video: mpeg2video (Main) (mpg2 / 0x3267706D), yuv420p(tv, top first), 720x576 [SAR 64:45 DAR 16:9], q=2-31, 25 fps, 25 tbr, 1k tbn
    Side data:
      cpb: bitrate max/min/avg: 7000000/0/0 buffer size: 1835008 vbv_delay: N/A
  Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, fltp, 192 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
  Stream #0:2 -> #0:1 (copy)
Press [q] to stop, [?] for help
[concat @ 0x555af2e17000] New subtitle stream 0:4 at pos:3141646 and DTS:10.96s  0x


  


  ...
Any ideas ?

  


• Why is the FindClass/JNI function behaving differently on nexus 5 and Honor Play ?

  17 août 2020, par Owl

  MobileFFmpeg v4.3.1LTS works on Honor Play, but doesn't work on Nexus 5. Why ?

  


  The build for Honor Play and nexus 5 is the same ->armeabi-v7a

  


  


  https://github.com/tanersener/mobile-ffmpeg/releases/tag/v4.3.1.LTS

  


  Nexus5 :enter image description here

  


  HonorPlay :enter image description here

  


  


  


  NDK = ndk-r14b

  


  


  


  JDK = jdk1.8.0_77

  


  


  I will ask the question immediately in English stackoverflow. Developing a game in Unreal Engine 4 v24.3. In the code itself there are only 2 lines that relate to MobileFFmpeg :

  


  Enabling the function :

  


  extern "C"
{
    int ffmpeg_execute(int argc, char** argv);
}


  


  Calling a function with ffmpeg parameters

  


  ffmpeg_execute(arg.size(), arg.data());


  


  Without mobile FFmpeg, the app on nexus 5 starts and works stably. When I start with FFmpeg, an error immediately appears and the app crashes :

  


  enter image description here

  


  The FindClass function does not work, the call itself is declared in mobile ffmpeg.c :

  


  /** Full name of the Config class */
const char *configClassName = "com/arthenica/mobileffmpeg/Config";


  


  ...

  


  /**
 * Called when 'mobileffmpeg' native library is loaded.
 *
 * @param vm pointer to the running virtual machine
 * @param reserved reserved
 * @return JNI version needed by 'mobileffmpeg' library
 */
jint JNI_OnLoad(JavaVM *vm, void *reserved) {
    JNIEnv *env;
    if ((*vm)->GetEnv(vm, (void**)(&env), JNI_VERSION_1_6) != JNI_OK) {
        LOGE("OnLoad failed to GetEnv for class %s.\n", configClassName);
        return JNI_FALSE;
    }

    jclass localConfigClass = (*env)->FindClass(env, configClassName);
    if (localConfigClass == NULL) {
        LOGE("OnLoad failed to FindClass %s.\n", configClassName);
        return JNI_FALSE;
    }
...


  


  I can't see what the FindClass(C++) function returns, Android Studio doesn't want to stop on the JNI_OnLoad(C++) function during debug.

  


  What are the assumptions why FindClass behavior is different on two phones ?