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• FFmpeg : HLS options cannot be set/get/find

  4 septembre 2013, par user2677612

  We are using FFmpeg libraries git-ee94362 libavformat v55.2.100.
  We are trying to write a simple HLS code example based on muxing.c standard one.
  Let be two input streams, video and audio (they can be synthetic, doesn't matter).
  Our purpose is to mux them into M3U8 playlist using HLS.
  Suppose, duration of every TS segment file be 3 sec, and the desirable maximum number of entries in M3U8 output file be 100.

  From the FFmpeg application sources, one can see that the Apple HTTP Live Streaming segmenter implemented in hlsenc.c file.
  And the relevant options there are, as well : "hls_list_size", "hls_time", etc.
  The problem is that we have not succeeded to set/get/find these options in a conventional way, as shown in the following code :

  ---

  // Here is a part of main() program
  
  
  
  int64_t i1 = 0;
  
  void *target_obj;
  
  
  
  AVFormatContext *ofmt_ctx = NULL;
  
  AVOutputFormat *ofmt = NULL;
  
  
  
  avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, "Example_Out.m3u8");
  
  
  
  ofmt = ofmt_ctx->oformat;
  
  
  
  // The relevant options ("hls_list_size", "hls_time") are located under ofmt->priv_class->option.
  
  // But AVClass *priv_class is not the first member of the AVOutputFormat.
  
  // So, due to the documentation, av_opt_find...(), av_opt_get...() and av_opt_set...() 
  
  // cannot be used for options within AVOutputFormat.
  
  // In practice, any of the following three lines causes exception.
  
  const AVOption *o = av_opt_find2(ofmt, "hls_list_size", NULL, 0, AV_OPT_SEARCH_CHILDREN, &target_obj);
  
  av_opt_get_int(ofmt, "hls_list_size", AV_OPT_SEARCH_CHILDREN, &i1);
  
  av_opt_set_int(ofmt, "hls_list_size", 10, AV_OPT_SEARCH_CHILDREN);

  ---

  Our question : If there is a way to overcome the problem, i.e. to set/get/find options for AVOutputFormat, like for AVCodecContext (for example) ?

  Thank you,

  Andrey Mochenov.

• Applying filter complex fails with something related to audio

  18 septembre 2014, par Alin

  I finally managed to build ffmpeg as detailed in here : https://enoent.fr/blog/2014/06/20/compile-ffmpeg-for-android/ and in the end, I have a ffmpeg library which accepts command arguments.

  I am trying to apply a watermark image over the video so for it I am using preparing this ffmpeg command :

  ffmpeg -i input.avi -i logo.png -filter_complex 'overlay=10:main_h-overlay_h-10' output.avi

  I have first tried it on windows using ffmpeg.exe and the result was as expected.

  I have tried it on android using the compiled android and the output is as follows :

  09-17 22:03:34.455: I/Videokit(18419): Loading native library compiled at 22:33:10 Sep 15 2014
  
  09-17 22:03:34.455: I/Videokit(18419): Option: ffmpeg
  
  09-17 22:03:34.455: I/Videokit(18419): Option: -loglevel
  
  09-17 22:03:34.455: I/Videokit(18419): Option: debug
  
  09-17 22:03:34.455: I/Videokit(18419): Option: -i
  
  09-17 22:03:34.455: I/Videokit(18419): Option: /storage/emulated/0/vid.mp4
  
  09-17 22:03:34.455: I/Videokit(18419): Option: -i
  
  09-17 22:03:34.455: I/Videokit(18419): Option: /storage/emulated/0/logo.png
  
  09-17 22:03:34.455: I/Videokit(18419): Option: -qscale:v
  
  09-17 22:03:34.455: I/Videokit(18419): Option: 1
  
  09-17 22:03:34.455: I/Videokit(18419): Option: -filter_complex
  
  09-17 22:03:34.455: I/Videokit(18419): Option: overlay=10:main_h-overlay_h-10
  
  09-17 22:03:34.455: I/Videokit(18419): Option: /storage/emulated/0/outVid.mp4
  
  09-17 22:03:34.455: I/Videokit(18419): Running main
  
  09-17 22:03:34.463: D/Videokit(18419): Splitting the commandline.
  
  09-17 22:03:34.463: D/Videokit(18419): Reading option '-loglevel' ...
  
  09-17 22:03:34.463: D/Videokit(18419):  matched as option 'loglevel' (set logging level) with argument 'debug'.
  
  09-17 22:03:34.463: D/Videokit(18419): Reading option '-i' ...
  
  09-17 22:03:34.463: D/Videokit(18419):  matched as input file with argument '/storage/emulated/0/vid.mp4'.
  
  09-17 22:03:34.463: D/Videokit(18419): Reading option '-i' ...
  
  09-17 22:03:34.463: D/Videokit(18419):  matched as input file with argument '/storage/emulated/0/logo.png'.
  
  09-17 22:03:34.463: D/Videokit(18419): Reading option '-qscale:v' ...
  
  09-17 22:03:34.463: D/Videokit(18419):  matched as option 'qscale' (use fixed quality scale (VBR)) with argument '1'.
  
  09-17 22:03:34.463: D/Videokit(18419): Reading option '-filter_complex' ...
  
  09-17 22:03:34.463: D/Videokit(18419):  matched as option 'filter_complex' (create a complex filtergraph) with argument 'overlay=10:main_h-overlay_h-10'.
  
  09-17 22:03:34.463: D/Videokit(18419): Reading option '/storage/emulated/0/outVid.mp4' ...
  
  09-17 22:03:34.463: D/Videokit(18419):  matched as output file.
  
  09-17 22:03:34.463: D/Videokit(18419): Finished splitting the commandline.
  
  09-17 22:03:34.463: D/Videokit(18419): Parsing a group of options: global .
  
  09-17 22:03:34.463: D/Videokit(18419): Applying option loglevel (set logging level) with argument debug.
  
  09-17 22:03:34.463: D/Videokit(18419): Applying option filter_complex (create a complex filtergraph) with argument overlay=10:main_h-overlay_h-10.
  
  09-17 22:03:34.463: D/Videokit(18419): Successfully parsed a group of options.
  
  09-17 22:03:34.463: D/Videokit(18419): Parsing a group of options: input file /storage/emulated/0/vid.mp4.
  
  09-17 22:03:34.463: D/Videokit(18419): Successfully parsed a group of options.
  
  09-17 22:03:34.463: D/Videokit(18419): Opening an input file: /storage/emulated/0/vid.mp4.
  
  09-17 22:03:34.612: D/Videokit(18419): Successfully opened the file.
  
  09-17 22:03:34.612: D/Videokit(18419): Parsing a group of options: input file /storage/emulated/0/logo.png.
  
  09-17 22:03:34.612: D/Videokit(18419): Successfully parsed a group of options.
  
  09-17 22:03:34.612: D/Videokit(18419): Opening an input file: /storage/emulated/0/logo.png.
  
  09-17 22:03:34.620: D/Videokit(18419): Successfully opened the file.
  
  09-17 22:03:34.620: D/Videokit(18419): Parsing a group of options: output file /storage/emulated/0/outVid.mp4.
  
  09-17 22:03:34.620: D/Videokit(18419): Applying option qscale:v (use fixed quality scale (VBR)) with argument 1.
  
  09-17 22:03:34.620: D/Videokit(18419): Successfully parsed a group of options.
  
  09-17 22:03:34.620: D/Videokit(18419): Opening an output file: /storage/emulated/0/outVid.mp4.
  
  09-17 22:03:34.627: D/Videokit(18419): Successfully opened the file.
  
  09-17 22:03:34.643: I/Videokit(18419): Conversion failed!
  
  09-17 22:03:34.643: I/Videokit(18419): Stream mapping:
  
  09-17 22:03:34.643: E/Videokit(18419): Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height

  The problem is Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height and this is somehow related to audio of the file. I have removed the audio and I get no error.

  ffmpeg -i vid.mp4 returns this :

  Command line:
  
  ffmpeg -i vid.mp4 -report
  
  ffmpeg version N-66278-g91459bd Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Sep 14 2014 22:05:07 with gcc 4.8.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib
  
    libavutil      54.  7.100 / 54.  7.100
  
    libavcodec     56.  1.100 / 56.  1.100
  
    libavformat    56.  4.101 / 56.  4.101
  
    libavdevice    56.  0.100 / 56.  0.100
  
    libavfilter     5.  1.100 /  5.  1.100
  
    libswscale      3.  0.100 /  3.  0.100
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  0.100 / 53.  0.100
  
  Splitting the commandline.
  
  Reading option '-i' ... matched as input file with argument 'vid.mp4'.
  
  Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option report (generate a report) with argument 1.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input file vid.mp4.
  
  Successfully parsed a group of options.
  
  Opening an input file: vid.mp4.
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 040e38c0] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 040e38c0] ISO: File Type Major Brand: isom
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 040e38c0] Before avformat_find_stream_info() pos: 19279 bytes read:32768 seeks:0
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 040e38c0] All info found
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 040e38c0] After avformat_find_stream_info() pos: 41952 bytes read:65536 seeks:0 frames:2
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vid.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.19.104
  
    Duration: 00:00:14.58, start: 0.023222, bitrate: 1250 kb/s
  
      Stream #0:0(und), 1, 1/11988: Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x640 [SAR 1:1 DAR 1:1], 1099 kb/s, 29.97 fps, 29.97 tbr, 11988 tbn, 59.94 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und), 1, 1/44100: Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 97 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:2(eng), 0, 1/90000: Data: none (rtp  / 0x20707472), 39 kb/s
  
      Metadata:
  
        handler_name    : HintHandler
  
      Stream #0:3(eng), 0, 1/44100: Data: none (rtp  / 0x20707472), 8 kb/s
  
      Metadata:
  
        handler_name    : HintHandler
  
  Successfully opened the file.
  
  At least one output file must be specified
  
  [AVIOContext @ 040e3f40] Statistics: 65536 bytes read, 0 seeks

• ffmpeg make file configuration options

  23 mars 2016, par George Varghese

  I am trying to implement a media player plugin in chrome using ffmpeg. This player should support rtsp,h264, MJPEG formats.

  My question is, which decoders/encoders need to be enabled in ffmpeg build script ?

  Regards,
  George