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• Which Dedicated Server for FFMPEG ?

  11 février 2017, par OarSmaN

  My website converts video to audio and video to video using FFMPEG (full Centos 64bit install). Mostly i got multiple conversions (10-20) real time. I use cache for already converted audios/videos. I am currently moving to a dedicated server and i need to know which configuration would be best for my situation.

  Which of the below servers is better for FFMPEG ;

  SINGLE Intel® Xeon® Processor E3-1270 v5, 8M Smart Cache, 3.60 GHz, 8 GT/s DMI3 (4 Cores-8 Threads) / 32GB DDR4 2133 / 240GB S3500 Intel Wolfsville SSD + 1TB Enterprise Grade HDD (for caching)

  DUAL Intel® Xeon® Processor E5-2620, 15M Smart Cache, 2.00 GHz, 7.20 GT/s Intel® QPI (12 Cores-24 Threads) / 32GB DDR3 1333 / 120GB S3500 Intel Wolfsville SSD + 1TB Enterprise Grade HDD (for caching)

  thanks for your ideas.

• Using -itsoffset with AAC Tracks in MP4 : What Actually Happens ? [closed]

  10 avril, par user27607034

  If the frame duration of an AAC file is around 21 milliseconds, does the itsoffset value in the following command actually get applied ? And even if it does, will players like QuickTime or a smart TV actually respect it ?

  


  ffmpeg -itsoffset 0.009 -i input.mp4 \
  -i input.mp4 \
  -map 1:v:0 \ // hevc
  -map 0:a:0 \ // aac
  -c copy \
  output.mp4


  


• FFmpeg convert time to frame

  3 décembre 2013, par William Seemann

  Does anyone know how to convert a timestamp into a frame ? For example, if I wanted the frame number at 2 seconds in a video with a framerate of 30/fps it would be the 60th frame. Here is the code I have so far. However, I don't think it's correct since seek_time has a value of 90 (for a 1 sec target) using a video with a framerate of 23.98 :

  int timeUs = 1000000; // 1 sec
  
  AVPacket packet;
  
  AVPacket *pkt = NULL;
  
  int64_t desired_frame_number = -1;
  
  
  
  State *state = *ps;
  
  
  
  Options opt = option;
  
  
  
  int stream_index = state->video_stream;
  
  int64_t seek_time = av_rescale_q(timeUs, AV_TIME_BASE_Q, state->pFormatCtx->streams[stream_index]->time_base);
  
  int64_t seek_stream_duration = state->pFormatCtx->streams[stream_index]->duration;
  
  
  
  int flags = 0;
  
  int ret = -1;
  
  
  
  // Convert time into frame number
  
  seek_time /= 1000;
  
  printf("seek time: %" PRId64 "\n", seek_time);