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• Revision c82de3bede : Extending ext_tx expt to include dst variants Extends the ext-tx experiment to

  15 novembre 2014, par Deb Mukherjee

  Changed Paths :
   Modify /vp9/common/vp9_blockd.h

  
   Modify /vp9/common/vp9_entropymode.c

  
   Modify /vp9/common/vp9_entropymode.h

  
   Modify /vp9/common/vp9_enums.h

  
   Modify /vp9/common/vp9_idct.c

  
   Modify /vp9/decoder/vp9_decodeframe.c

  
   Modify /vp9/decoder/vp9_decodemv.c

  
   Modify /vp9/encoder/vp9_bitstream.c

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_encodemb.c

  
   Modify /vp9/encoder/vp9_encoder.h

  
   Modify /vp9/encoder/vp9_rd.c

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Extending ext_tx expt to include dst variants

  Extends the ext-tx experiment to include regular and flipped
  DST variants. A total of 9 transforms are thus possible for
  each inter block with transform size <= 16x16.

  In this patch currently only the four ADST_ADST variants
  (flipped or non-flipped in both dimensions) are enabled
  for inter blocks.

  The gain with the ext-tx experiment grows to +1.12 on derflr.
  Further experiments are underway.

  Change-Id : Ia2ed19a334face6135b064748f727fdc9db278ec

• ffmpeg - creating segments of equivalent duration

  13 octobre 2014, par Code_Ed_Student

  I am testing out segment to split a video into segments of 10 seconds each, but I’m noticing some unusual results. In particular, some of the segments generated have varying lengths from 5 seconds to 11 seconds. I’ve tried playing around with segment_time_delta and force_key_frames to make the segments as close to 10 seconds as possible, but it doesn’t seem to be working out so well. How could I make all segments the same duration ?

  ffmpeg -i input.mp4 -force_key_frames 10,20,30,40,50,60,70,80,90,100,110,120 -c copy -map 0 -segment_time 10 -f segment output%01d.mp4

  Results :

  My_vid.mp4 – total duration - 00:02:08
  
  Output1.mp4 00:00:07
  
  Output2.mp4 00:00:07
  
  Output3.mp4 00:00:08
  
  Output4.mp4 00:00:08
  
  Output5.mp4 00:00:09
  
  Output6.mp4 00:00:09
  
  Output7.mp4 00:00:10
  
  Output8.mp4 00:00:10
  
  Output9.mp4 00:00:10
  
  Output10.mp4 00:00:11
  
  Output11.mp4  00:00:11
  
  Output12.mp4 00:00:11
  
  Output12.mp4 00:00:13

• how to add duration to mjpeg or how to make mjpeg faster

  10 octobre 2014, par n2v2rda2

  i have ip-cam mjpeg that i made and it have total 240 frames

  encode souce is
  ffmpeg.exe -framerate 25 -i c :\%06d.jpg\ -s 1920x1080 -qscale 1 -vcodec mjpeg -r 25 C :\result.mjpg -y

  now i want to play result.mjpg by mjpeg player i made

  my problem
  
  1. i can't get mjpeg's play time or duration time
  
  
  
  2. playing is slower then other movie player so i want to sync it and play more faster

  below is ffprobe result

  Input #0, mjpeg, from 'result.mjpg':
  
  Duration: N/A, bitrate: N/A
  
  Stream #0:0: Video: mjpeg, yuvj444p(pc, bt470bg), 1920x1080, 25 tbr, 1200k tbn, 25 tbc

  below is result added -show_frame

  [FRAME]
  
  media_type=video
  
  key_frame=1
  
  pkt_pts=720000
  
  pkt_pts_time=0.600000
  
  pkt_dts=720000
  
  pkt_dts_time=0.600000
  
  best_effort_timestamp=720000
  
  best_effort_timestamp_time=0.600000
  
  pkt_duration=48000
  
  pkt_duration_time=0.040000
  
  pkt_pos=4731406
  
  pkt_size=313289
  
  width=1920
  
  height=1080
  
  pix_fmt=yuvj444p
  
  sample_aspect_ratio=333:320
  
  pict_type=I
  
  coded_picture_number=0
  
  display_picture_number=0
  
  interlaced_frame=0
  
  top_field_first=0
  
  repeat_pict=0
  
  [/FRAME]

  ffprobe show me there are Duration : N/A, bitrate : N/A

  how do i set Duration and bitrate
  is there any encode-option i have to set ?

  when i decode mjpeg like below

  i can’t get duration just 0

  AVFormatContext*  pFC;
  
  int               ret;
  
  
  
  pFC = avformat_alloc_context();
  
  
  
  ret  = avformat_open_input(&pFC, filename, NULL, NULL);
  
  if (ret < 0) {
  
      // fail .
  
  }
  
  
  
  ret  = avformat_find_stream_info(pFC, NULL);
  
  if (ret < 0) {
  
      // fail
  
  }
  
  printf("duration %ld", pFC->duration);   <----- only 0