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• looking for the right regex expression to pick some specific sentences from a file using java regex

  26 novembre 2014, par sachh_ke_nasdiik

  I am writing a program in java that records the screen.
  it is actually something that uses the ffmpeg tool
  with a simple GUI.
  what I actually need is a way to grab from the following file :

  1. ffmpeg version N-57367-g2f31b73 Copyright (c) 2000-2013 the FFmpeg developers

  2. built on Oct 23 2013 20:22:19 with gcc 4.8.2 (GCC)

  3. configuration : —enable-gpl —enable-version3 —disable-w32threads —enable-avisynth
     — enable->bzlib —enable-fontconfig —enable-frei0r —enable-gnutls —enable-iconv —enable-
     libass —enable-libbluray —enable-libcaca —enable-libfreetype —enable-libgsm —enable-libilbc —enable-
     libmodplug —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-
     libopenjpeg —enable-libopus —enable-librtmp —enable-libschroedinger —enable-libsoxr —enable-
     libspeex —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvo-aacenc —enable-
     libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libx264 —enable-
     libxavs —enable-libxvid —enable-zlib

  4. libavutil 52. 47.101 / 52. 47.101
  5. libavcodec 55. 38.101 / 55. 38.101
  6. libavformat 55. 19.104 / 55. 19.104
  7. libavdevice 55. 4.100 / 55. 4.100
  8. libavfilter 3. 89.100 / 3. 89.100
  9. libswscale 2. 5.101 / 2. 5.101
  10. libswresample 0. 17.104 / 0. 17.104
  11. libpostproc 52. 3.100 / 52. 3.100
  12. [dshow @ 02482700] DirectShow video devices
  13. [dshow @ 02482700] "screen-capture-recorder"
  14. [dshow @ 02482700] DirectShow audio devices
  15. [dshow @ 02482700] "Microphone (ASUS Xonar DGX Audio Device)"
  16. [dshow @ 02482700] "virtual-audio-capturer"
  17. [dshow @ 02482700] "Line In (ASUS Xonar DGX Audio Device)"
  18. [dshow @ 02482700] "Stereo Mix (ASUS Xonar DGX Audio Device)"
  19. [dshow @ 02482700] "Aux (ASUS Xonar DGX Audio Device)"
  20. [dshow @ 02482700] "Wave (ASUS Xonar DGX Audio Device)"
  21. dummy : Immediate exit requested

  only the sentences between the quotation marks,
  those that describes the different devices,
  that shows up at the end of the file,
  ignoring of course the line numbering, that does not appear in the
  output file, but inserted here for better fluency.
  does anyone have any ideas how to work it out using java regex ?
  assuming I am using an enhanced for loop over a string array
  checking each line for its contents.

• Revision c8ed36432e : Non-uniform quantization experiment This framework allows lower quantization bi

  4 mars 2015, par Deb Mukherjee

  Changed Paths :
   Modify /configure

  
   Modify /vp9/common/vp9_blockd.h

  
   Modify /vp9/common/vp9_onyxc_int.h

  
   Modify /vp9/common/vp9_quant_common.c

  
   Modify /vp9/common/vp9_quant_common.h

  
   Modify /vp9/common/vp9_rtcd_defs.pl

  
   Modify /vp9/decoder/vp9_decodeframe.c

  
   Modify /vp9/decoder/vp9_detokenize.c

  
   Modify /vp9/encoder/vp9_block.h

  
   Modify /vp9/encoder/vp9_encodemb.c

  
   Modify /vp9/encoder/vp9_encodemb.h

  
   Modify /vp9/encoder/vp9_quantize.c

  
   Modify /vp9/encoder/vp9_quantize.h

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Non-uniform quantization experiment

  This framework allows lower quantization bins to be shrunk down or
  expanded to match closer the source distribution (assuming a generalized
  gaussian-like central peaky model for the coefficients) in an
  entropy-constrained sense. Specifically, the width of the bins 0-4 are
  modified as a factor of the nominal quantization step size and from 5
  onwards all bins become the same as the nominal quantization step size.
  Further, different bin width profiles as well as reconstruction values
  can be used based on the coefficient band as well as the quantization step
  size divided into 5 ranges.

  A small gain currently on derflr of about 0.16% is observed with the
  same paraemters for all q values.
  Optimizing the parameters based on qstep value is left as a TODO for now.

  Results on derflr with all expts on is +6.08% (up from 5.88%).

  Experiments are in progress to tune the parameters for different
  coefficient bands and quantization step ranges.

  Change-Id : I88429d8cb0777021bfbb689ef69b764eafb3a1de

• ffmpeg stream snapshot at clocktime

  23 octobre 2020, par vnm

  Im trying to make snapshot of RTSP stream every hour (at clock hour).

  


  I successfully segmented video files by the hour by this command :

  


  ffmpeg -i <input stream="stream" /> -f segment -segment_atclocktime 1 -segment_time 3600 <output files="files">&#xA;</output>

  


  But it doesnt work for sapshot :

  


  ffmpeg -i i <input stream="stream" /> -f segment -segment_atclocktime 1 -segment_time 3600 -segment_format singlejpeg <output files="files">&#xA;</output>

  


  It creates mjpeg video instead of snapshot.

  


  Maybe there is another way to do snapshot every real-time hour ?

  


  Thank you !