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• Gstreamer pipeline to scale down video before streaming

  20 novembre 2014, par r3dsm0k3

  Here is what Im trying to achieve.

  Im streaming from a Logitech C920 camera on beaglebone black with gstreamer. I have to save a copy of the video saved locally while it is streaming. I have achieved that with tee.
  Logitech camera gives h264 encoded video at a certain bitrate, mostly very high.

  Im streaming from a moving car on 3G, and the network is not good enough to send the stream to nginx-rtmp server Im using to re-distribute thus gives strong artifacts in the result.

  Im able to alter the bitrate of captured video using uvch264.
  But then, the locally saved video also would have lower bitrate.

  Is there anyway of capturing a higher bitrate 1080p video from the camera and sending a lower resolution, lower bitrate video the streaming server ?

  Following is the pipeline I have currently.

  gst-launch-1.0 -v -e uvch264src initial-bitrate=400000 average-bitrate=400000 iframe-period=3000  device=/dev/video0 name=src auto-start=true  src.vidsrc ! queue ! video/x-h264,width=1920,height=1080,framerate=30/1 ! h264parse ! flvmux streamable=true  name=flvmuxer ! queue ! tee name=t ! queue ! filesink location=/mnt/test.flv t. ! queue ! rtmpsink location=$SERVER/hls/$CAM1

  I could also try sending the higher bitrate video to a udpsink instead of rtmpsink and with another gstreamer process parallely and takes the data using a udpsink and probably post process/ re-encode and send to rtmp server.

  Im also limited by the processing speed BeagleBone has to do for encoding the videos. Currently Im trying for 1 camera and in the finished project I would like to have 2 cameras connected. Upload speed Im getting for the network is under 1Mbps.

  How do I solve this with less load on the BeagleBone ? Im very open to a new architecture as well.

• mp4 video file generated using ffmpeg, works on desktop but doesn't work on android emulator

  8 mai 2014, par Nikesh

  I am generating a video that converts images into .mp4 video file. Every thing works fine. File is also generated as mp4 but the file doesn’t run on android device, says cannot play video.

  Please find the attached sample code which convert single jpeg file into video (.mp4)

  Please help me to resolve this issue. Thanks.

  JNIEXPORT void JNICALL Java_roman10_ffmpegtst_VideoBrowser_videoExample(JNIEnv *pEnv, jobject pObj, char* imagefile,char* videoFile)
  
  {
  
  avcodec_init();
  
  av_register_all();
  
  avcodec_register_all();
  
  
  
  AVCodecContext          *pOCtx= NULL;
  
  AVCodec                 *pOCodex = NULL;
  
  LOGE(10,"Start videoExample");
  
  pOCodex = avcodec_find_encoder(AV_CODEC_ID_MPEG1VIDEO);
  
  
  
  if (!pOCodex) {
  
      LOGE(10,"Cannot find encoder %s", pOCodex);
  
      exit(1);
  
  }
  
  
  
  pOCtx= avcodec_alloc_context3(pOCodex);
  
  
  
  uint8_t *outbuf;
  
  int i, out_size;
  
  
  
  pOCtx->bit_rate = 400000;
  
  pOCtx->width = 640;
  
  pOCtx->height = 480;
  
  AVRational rational = {1,25};
  
  pOCtx->time_base= rational;
  
  pOCtx->gop_size = 10; /* emit one intra frame every ten frames */
  
  pOCtx->max_b_frames=1;
  
  pOCtx->pix_fmt = AV_PIX_FMT_YUV420P;
  
  
  
  LOGE(10,"Start avcodec_open2");
  
  int ret = avcodec_open2(pOCtx,pOCodex,NULL);
  
  if(ret < 0)
  
  {
  
       return;
  
  }
  
  LOGE(10,"End avcodec_open2");
  
  AVFormatContext         *pIFormatCtx = NULL;
  
   ret = avformat_open_input(&pIFormatCtx, imagefile, NULL, NULL);
  
  if(ret < 0)
  
  {
  
      //Cant't open jpg file
  
      return;
  
  }
  
  av_dump_format(pIFormatCtx, 0, imagefile, 0);
  
  
  
  AVCodecContext          *pICodecCtx;  //output codec context
  
  pICodecCtx = pIFormatCtx->streams[0]->codec;
  
  /*pICodecCtx->width = 640;
  
  pICodecCtx->height = 480;
  
  pICodecCtx->pix_fmt = PIX_FMT_YUV420P;*/
  
  
  
  
  
  AVCodec *pICodec = avcodec_find_decoder(pICodecCtx->codec_id); //output codec
  
   // Open codec
  
  ret = avcodec_open2(pICodecCtx, pICodec,NULL);
  
  if(ret < 0)
  
  {
  
      //Can't find the decoder
  
      return;
  
  }
  
  
  
  AVFrame *pIFrame = avcodec_alloc_frame();
  
  if (!pIFrame)
  
  {
  
      //Can't alloc the input frame
  
      return ;
  
  }
  
  
  
  
  
  int bufSize = avpicture_get_size(AV_PIX_FMT_YUVJ420P, pICodecCtx->width, pICodecCtx->height);
  
  uint8_t *buffer = (uint8_t *) av_malloc(bufSize * sizeof(uint8_t));
  
  
  
  avpicture_fill((AVPicture *) pIFrame, buffer, AV_PIX_FMT_YUVJ420P, pICodecCtx->width, pICodecCtx->height);
  
  
  
  FILE *outputFile;
  
  
  
  outputFile = fopen(videoFile, "w+");
  
  if (!outputFile) {
  
      LOGE(10,"could not open ");
  
      exit(1);
  
  }
  
  
  
  int outbuf_size = 100000;
  
  outbuf = (uint8_t*)malloc(outbuf_size);
  
  
  
  AVPacket packet;
  
  int frameFinished;
  
  int framesNumber = 0;
  
  while (av_read_frame(pIFormatCtx, &packet) >= 0)
  
  {
  
      if(packet.stream_index != 0)
  
          continue;
  
  
  
      ret = avcodec_decode_video2(pICodecCtx, pIFrame, &frameFinished, &packet);
  
      if (ret > 0)
  
      {
  
          pIFrame->quality = 4;
  
  
  
          for(i=0;i<25;i++) {
  
              fflush(stdout);
  
              /* encode the image */
  
              out_size = avcodec_encode_video(pOCtx, outbuf, outbuf_size, pIFrame);
  
              fwrite(outbuf, 1, out_size, outputFile);
  
          }
  
      }
  
  }
  
  
  
  /* get the delayed frames */
  
  for(; out_size; i++) {
  
      fflush(stdout);
  
      out_size = avcodec_encode_video(pOCtx, outbuf, outbuf_size, NULL);
  
      fwrite(outbuf, 1, out_size, outputFile);
  
  }
  
  
  
  /* add sequence end code to have a real mpeg file */
  
  outbuf[0] = 0x00;
  
  outbuf[1] = 0x00;
  
  outbuf[2] = 0x01;
  
  outbuf[3] = 0xb7;
  
  fwrite(outbuf, 1, 4, outputFile);
  
  fclose(outputFile);
  
  free(outbuf);
  
  
  
  avcodec_close(pOCtx);
  
  av_free(pOCtx);
  
  av_free(pIFrame);
  
  }

• Android HLS plays first segment then only audio

  1er décembre 2014, par Chris Recalis

  I’m having difficulty playing HLS on Android where only the audio is playing. The stream will play for the first video segment and then turn into an audio only stream. Here is a sample link https://clipter.com/c/aymels8/hls.m3u8

  hls.m3u8

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-PLAYLIST-TYPE:VOD
  
  #EXT-X-TARGETDURATION:9
  
  #EXT-X-ALLOW-CACHE:YES
  
  #EXTINF:8.5,
  
  https://d3ilpkc014v0xn.cloudfront.net/f5305de24/2103cb31c3078eb5edd5c325108f6d6f.ts?1416176849
  
  #EXTINF:7.33,
  
  https://d3ilpkc014v0xn.cloudfront.net/f5305de24/1214ef63a031e3d3229893fdb60eea86.ts?1416176848
  
  #EXTINF:8.5,
  
  https://d3ilpkc014v0xn.cloudfront.net/f5305de24/99c47c49548521b0fff05119a5c63908.ts?1416176889
  
  #EXTINF:8.43,
  
  https://d3ilpkc014v0xn.cloudfront.net/f5305de24/143acefc2149f2572ddcc08abb705736.ts?1416176988
  
  #EXTINF:4.43,
  
  https://d3ilpkc014v0xn.cloudfront.net/f5305de24/11c92b5084971e0cf4768f958e97f936.ts?1416177431
  
  #EXTINF:6.9,
  
  https://d3ilpkc014v0xn.cloudfront.net/f5305de24/10ab810169fb684469f736a53f2cba3a.ts?1416177545
  
  #EXTINF:8.57,
  
  https://d3ilpkc014v0xn.cloudfront.net/f5305de24/88b037af27757e4805d7f1ed0496cbb8.ts?1416178434
  
  #EXTINF:2.1,
  
  https://d3ilpkc014v0xn.cloudfront.net/f5305de24/4a8cda13ea40228de4638dee9985b8b0.ts?1416178513
  
  #EXTINF:8.47,
  
  https://d3ilpkc014v0xn.cloudfront.net/f5305de24/e6fa0135987c86d323f1e994bcd2b429.ts?1416179772
  
  #EXTINF:8.38,
  
  https://d3ilpkc014v0xn.cloudfront.net/f5305de24/9a08aba19b45601c83854216bb07a6b6.ts?1416604373
  
  #EXT-X-ENDLIST

  output from ffprobe

  ffprobe version 2.3.3 Copyright (c) 2007-2014 the FFmpeg developers
  
    built on Aug 25 2014 19:47:15 with Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.3.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  
    libavutil      52. 92.100 / 52. 92.100
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 48.100 / 55. 48.100
  
    libavdevice    55. 13.102 / 55. 13.102
  
    libavfilter     4. 11.100 /  4. 11.100
  
    libavresample   1.  3.  0 /  1.  3.  0
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mpegts, from '2103cb31c3078eb5edd5c325108f6d6f.ts?1416176849':
  
    Duration: 00:00:08.53, start: 1.400000, bitrate: 1236 kb/s
  
    Program 1 
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0:0[0x100]: Video: h264 (Constrained Baseline) ([27][0][0][0] / 0x001B), yuv420p, 480x480, 30 fps, 30 tbr, 90k tbn, 60 tbc
  
      Stream #0:1[0x101](und): Audio: aac ([15][0][0][0] / 0x000F), 44100 Hz, mono, fltp, 67 kb/s