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• ffmpeg : avcodec_open2 returns invalid argument

  12 mai 2016, par roari

  i’m reusing the sample code from the developer 64bit release of ffmpeg in my application to encode a video :

  AVCodec* pCodec_{nullptr};
  
  AVCodecContext* pContext_{nullptr};
  
  
  
  avcodec_register_all();
  
  pCodec_ = avcodec_find_encoder(AV_CODEC_ID_MPEG2VIDEO);
  
  if (!pCodec_) {}
  
  
  
  pContext_ = avcodec_alloc_context3(pCodec_);
  
  if (!pContext_) {}
  
  
  
  pContext_->bit_rate = 400000;
  
  pContext_->width = size.width();
  
  pContext_->height = size.height();
  
  
  
  pContext_->time_base.den = 1;
  
  pContext_->time_base.num = fps;
  
  
  
  pContext_->gop_size = 10;
  
  pContext_->max_b_frames = 1;
  
  pContext_->pix_fmt = AV_PIX_FMT_BGR0;
  
  
  
  if (codec_id == AV_CODEC_ID_H264) {
  
      av_opt_set(pContext_->priv_data, "preset", "slow", 0);
  
  }
  
  
  
  int err = avcodec_open2(pContext_, pCodec_, nullptr);
  
  if (err < 0) {}

  AVCodec* and AVCodecContext* look like they are allocated correctly. avcodec_open2 then returns invalid argument (-22).

  I use : Windows 10 64, VS2013 Compiler, Qt Creator IDE, ffmpeg(2016-05-12) 64bit.

  The sample i took the code from is "decoding_encoding.c".

  Any ideas ?

• avutil/rational : Check that av_reduce() returns values within the requested max

  29 décembre 2014, par Michael Niedermayer

  avutil/rational : Check that av_reduce() returns values within the requested max
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavutil/rational.c

• webm live input to HLS live output

  15 avril 2021, par Lewis Tyler

  I have ben struggling with this for quite some time ; Essentially what I'm trying to do is broadcast my webcam from within the Browser to Ffmpeg on the server to convert into a .m3u8 HLS live stream. But I am having a few problems with video playback I initially thought it was CORS and cross origin headers however now I am thinking its to do with the way I'm trying to encode the media.

  


  I did a ffprobe on the input this was the response ;

  


  SERVER:key destination set to:1618380585-6666-863686008-4444-21
FFMPEG:Input #0, matroska,webm, from 'pipe:':
  Metadata:
    encoder         : Chrome
  Duration: 
FFMPEG:N/A, start: 0.000000, bitrate: N/A
    Stream #0:0(eng): Audio: opus, 48000 Hz, mono, fltp (default)
    Stream #0:1(eng): Video: h264 (Constrained Baseline), yuv420p, 640x480, SAR 1:1 DAR 4:3, 30.30 fps, 30 tbr, 1k tbn, 60 tbc (default)


  


  I am wondering if someone could help with the ffmpeg parameters ; I am currently using the following ;

  


      var ops=[
        '-r', '17',
        '-i','-',
        '-strict', '-2',
        '-vf', 'scale=w=1280:h=720:force_original_aspect_ratio=decrease',
        '-c:a', 'aac',
        '-ar', '48000',
        '-b:a', '128k',
        '-c:v', 'h264',
        '-profile:v', 'main',
        '-crf', '20',
        '-g', '48',
        '-keyint_min', '48',
        '-sc_threshold', '0',
        '-hls_time', '4',       
        '-hls_segment_filename', '/var/www/html/streams/segments/streamKey-date-%02d.ts',
        '-hls_base_url', '/streams/segments/',
        '/var/www/html/streams/streamKey.m3u8'
    ];


  


  I have also run into other problems and I was also wondering if i needed to build ffmpeg differently ; here is the current build I am running ; I only wonder this becuase when i try to add the -hls_playlist_type live parameter I get a response of not found.

  


  ffmpeg version 2.8.17-0ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609
  configuration: --prefix=/usr --extra-version=0ubuntu0.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  libavutil      54. 31.100 / 54. 31.100
  libavcodec     56. 60.100 / 56. 60.100
  libavformat    56. 40.101 / 56. 40.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 40.101 /  5. 40.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.101 /  1.  2.101
  libpostproc    53.  3.100 / 53.  3.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...


  


  EDIT

  


  I have also included an example .m3u8

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:6
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:5.647056,
/streams/segments/1618380585-6666-863686008-4444-21-668-00.ts
#EXTINF:2.823533,
/streams/segments/1618380585-6666-863686008-4444-21-668-01.ts
#EXTINF:5.647056,
/streams/segments/1618380585-6666-863686008-4444-21-668-02.ts
#EXTINF:0.294122,
/streams/segments/1618380585-6666-863686008-4444-21-668-03.ts
#EXT-X-ENDLIST