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• ffmpeg progress is freezing frames when scene change

  19 août 2017, par Karol

  I’m capturing data from IP camera with RTSP protocol with ffmpeg with command :

  ffmpeg -rtsp_transport tcp -progress /media/kamip/stats.txt -i rtsp://192.168.1.220:554/live/h264/ch0 
  
  -c:v copy -c:a copy -strict 1 -map 0 -f segment -strftime 1 
  
  -segment_time 1800 /media/kamip/cam_%d_%m_%Y_%H_%M_%S.mkv

  I’m using this for 5 cameras. One is different type and it is in different location.
  Because ffmpeg does not support reconnect I’m writing status to /media/kamip/stats.txt file. In another script I’m parsing this output and every 30 seconds I’m checking if frame number changed, if yes - it is ok, if not, I’m restarting above command.

  The problem is only in the night. When is quite dark and suddenly lights on, for example when car is parking, the /media/kamip/stats.txt is showing the same frame number, so my script is recognizing this as a lost connection (video freeze)

  I tried "-strict 1" option and I think it is better (one false alarm per day instead of 10 per day), so I think this may be related to ffmpeg, not camera/video source, especially because the video is fine even frame number reported by ffmpeg is still the same. Also VLC does not have this kind of problem (but I cannot use it currently for this camera)

  I found that ffmpeg has build-in scene change detector, but it should works only when encoding video (I’m using "copy" option for audio and video) ?

  I’m thinking about different way of analyzing the video capturing, but this "-progress" in ffmpeg should works fine - and it is working fine for other cameras for few years).

  I also do not see any errors,
  when I encoded one cutted file with "-loglevel debug" I saw only information like below :

  [libx264 @ 0x25d77a0] scene cut at 174 Icost:2049115 Pcost:2006553 
  
  ratio:0.0208 bias:0.1387 gop:54 (imb:3186 pmb:168)

  ffmpeg in latest version

  ffmpeg version 3.3.3-1ubuntu1~16.04.york0 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609

  any help will be appreciated

• Change video file used for saving in table

  9 août 2017, par CR7

  I am trying to convert uploaded video file to mp4 format. It is working properly. But after that in my DB, it is saving the old video file details instead of converted file. Also the converted file is saved in the uploaded video name and extension. I am using streamio-ffmpeg gem

  In my model I have the following code.

  mount_uploader :video, VideoUploader

  and in the video_uploader.rb

  require 'streamio-ffmpeg'
  
  
  
  class VideoUploader < CarrierWave::Uploader::Base
  
    process :encode_video
  
  
  
    def encode_video
  
      file = FFMPEG::Movie.new(current_path)      
  
      filename = "#{current_path.chomp(File.extname(current_path))}.mp4"
  
      file.transcode(filename)
  
      FileUtils.mv(filename, current_path)
  
    end  
  
  end

  How can I set the current_path file to the converted file path

• ffmpeg yuvj422p color movie conversion avi2ogv

  28 juillet 2017, par 7Tonin

  While converting avi video to ogv, there is a color problem in output file.
  How can I solve this issue ?
  normal colors altered colors

  Actually a part of the problem is from the player - so weak question

  Command using ffmpeg-3.3.2-1.mga6.tainted :

  ffmpeg -i dscn0146.avi -pix_fmt yuv422p -s 640x480 dscn0146_hq.ogv -y

  And input metadata :

  Guessed Channel Layout for Input Stream #0.1 : mono
  
  Input #0, avi, from 'dscn0146.avi':
  
    Metadata:
  
      encoder         : 
  
      maker           : NIKON
  
      model           : COOLPIX S3500
  
      creation_time   : 2017-07-22 12:09:06
  
    Duration: 00:00:07.33, start: 0.000000, bitrate: 11091 kb/s
  
      Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 640x480, 10770 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc
  
      Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 22050 Hz, mono, s16, 352 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> theora (libtheora))
  
    Stream #0:1 -> #0:1 (pcm_s16le (native) -> vorbis (libvorbis))

  Processes normaly, but fires a warning :

  [swscaler @ 0xd3c3a0] deprecated pixel format used, make sure you did set range correctly

  Output metadata :

  Output #0, ogv, to 'dscn0146_hq.ogv':
  
    Metadata:
  
      model           : COOLPIX S3500
  
      maker           : NIKON
  
      encoder         : Lavf57.71.100
  
      Stream #0:0: Video: theora (libtheora), yuv422p(progressive), 640x480, q=2-31, 200 kb/s, 30 fps, 30 tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc57.89.100 libtheora
  
        model           : COOLPIX S3500
  
        maker           : NIKON
  
      Stream #0:1: Audio: vorbis (libvorbis), 22050 Hz, mono, fltp
  
      Metadata:
  
        encoder         : Lavc57.89.100 libvorbis
  
        model           : COOLPIX S3500
  
        maker           : NIKON