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• Mobile Camera live audio/video streaming and encoding

  7 juin 2015, par Strikecounter2

  I know this question has been asked a couple of times, but I still haven’t found the right answer for my question.

  I would like to code an app that is able to live-stream audio and video while the content is being recorded and then uploaded to a server. I’d prefer to have my own back-end using Parse, because I want a high scalability. I know that the video has to be encoded to a h.264 codec and the audio to an AAC codec, but I don’t know how to achieve this. I have heard of the FFmpeg framework, but I am not sure if I would violate their license if I distribute my app or even sell it to somebody else.
  I would then like to receive the stream from the server to open it on the iPhone/android phone.

  They key requirements would be :

  • Low Latency
  • About 24 fps
  • Audio/Video in sync
  • No buffering while watching

  I would like to use Swift as a programming language, but if there is no way to use a swift-wrapper for any frameworks I would focus on Objective-C too.

  I am willing to learn everything that is needed, but I don’t know where to start.

• Not able to change H264 profile to High from Main using FFMPEG API

  7 juin 2015, par AsG

  I am using QtFFMPEG wrapper(https://code.google.com/p/qtffmpegwrapper/) with Qt 5.4 and MSCV 2012. I want to encode a mp4 video from image files at 25 fps and high profile.
  I used the createFile() and encodeImage() functions from here

  I am using the below parameters :

  pCodecCtx=pVideoStream->codec;
  
  pCodecCtx->codec_id = pOutputFormat->video_codec;
  
  pCodecCtx->codec_type = ffmpeg::AVMEDIA_TYPE_VIDEO;
  
  pCodecCtx->profile=FF_PROFILE_H264_HIGH;
  
  pCodecCtx->bit_rate = Bitrate;
  
  pCodecCtx->width = getWidth();
  
  pCodecCtx->height = getHeight();
  
  pCodecCtx->time_base.den = fps;
  
  pCodecCtx->time_base.num = 1;
  
  pCodecCtx->gop_size = 10;
  
  pCodecCtx->pix_fmt = ffmpeg::PIX_FMT_YUV420P;
  
  pCodecCtx->qmin = 10;
  
  pCodecCtx->qmax = 51;

  The FFMPEG variables are :

  License: %s
  
   GPL version 3 or later
  
  AVCodec version %d
  
   3476480
  
  AVFormat configuration: %s
  
   --disable-static --enable-shared --enable-gpl --enable-version3 --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib

  Now I currently get a video with below properties :

  ID                             : 1
  
  Format                         : AVC
  
  Format/Info                    : Advanced Video Codec
  
  Format profile                 : Main@L3.2
  
  Format settings, CABAC         : No
  
  Format settings, ReFrames      : 1 frame
  
  Format settings, GOP           : M=1, N=10
  
  Codec ID                       : avc1
  
  Codec ID/Info                  : Advanced Video Coding
  
  Duration                       : 4s 320ms

  I want the profile to be "High" and the CABAC to be yes with 3 ReFrames. How do I achieve that ? I tried setting the profile, coder_type and max_b_frames but did not help. At times the generated file did not even play. Can anyone help please. Thanks.

  I also tried using the av_opt_set() way but could not find that function. Only function I have is av_opt_set_dict(), am I missing something - outdated FFMPEG or missing #include.

  Tried this too, didnt help-

     ffmpeg::AVDictionary *opt = NULL;
  
     int iRes = av_dict_set(&opt, "profile", "high", 0);
  
     av_opt_set_dict(pFormatCtx->priv_data, &opt);
  
     av_opt_set_dict(pFormatCtx, &opt);

  Please help.

  EDIT :
  I got a high quality mp4 by changing the qmin and qmax values and then reencoding the big sized output via command line. I will try to upgrade the FFMPEG as suggested by Ronald below. Please consider the question closed for now.

• Looking for a multimedia SDK (open source or paid) which can play audio (.mp3, .aac) and video (.mp4 etc.)

  8 avril 2022, par AhmadH

  I would like to embed audio (and video) files in my cross platform application.
Searching for an SDK with below functionality :

  


  

  1. Play audio - .mp3,.aac (are must) & other common formats

  


  2. Play video - .mp4 & other common formats

  


  3. Audio recording would be an added advantage.

  


  4. Open source or affordable price

  


  


  [ Note : FFmpeg is not an option due to some License restriction]

  


  **Anything that has all FFmpeg properties would be ideal.

  


  Looking online but haven't found any suitable option.
Please help.