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• lavc/vvc : Fix check whether QG is in first tile col

  19 mars 2024, par Frank Plowman

  lavc/vvc : Fix check whether QG is in first tile col
  The second part of this condition is intended to check whether the
  
  current quantisation group is in the first CTU column of the current
  
  tile.  The issue is that ctb_to_col_bd gives the x-ordinate of the first
  
  column of the current tile *in CTUs*, while xQg gives the x-ordinate of
  
  the quantisation group *in samples*.  Rectify this by shifting xQg by
  
  ctb_log2_size to get xQg in CTUs before comparing.
  Fixes FFVVC issues #201 and #203.
  

  • [DH] libavcodec/vvc/vvc_ctu.c

• How to capture audio in an xvfb system using ffmpeg

  12 juin 2016, par somya bhargava

  Want to capture the audio using ffmpeg
  Went to this link

  The error coming on the first one is
  ffmpeg exited with code 1 : hw:0 : Input/output error

  And the pulse one is running on my laptop but not on the server i think some missing drivers

  ffmpeg exited with code 1 : default : No such process

• ffmpeg change the order of the output

  14 juin 2020, par roko

  i try to change the order of the output of 3 inputs (2 audio + 1 video)
this is my command :

  



  /usr/bin/ffmpeg -async 1 \
-f pulse -i alsa_output.pci-0000_00_1b.0.analog-stereo.monitor \
-f pulse -i alsa_input.pci-0000_00_1b.0.analog-stereo \
-f x11grab -video_size 1920x1080 -framerate 8 -i :0.0 \
-filter_complex amix=inputs=2 \
-c:a aac -b:a 128k \
-c:v h264_nvenc -b:v 1500k -maxrate 1500k -minrate 1500k \
-override_ffserver -g 16 http://10.100.102.109:8090/feed1.ffm


  



  this command works but, the first output is audio , therefore my third app cant view this output 
this is my output :

  



  Stream mapping:
  Stream #0:0 (pcm_s16le) -> amix:input0 (graph 0)
  Stream #1:0 (pcm_s16le) -> amix:input1 (graph 0)
  amix (graph 0) -> Stream #0:0 (aac)
  Stream #2:0 -> #0:1 (rawvideo (native) -> h264 (h264_nvenc))
Press [q] to stop, [?] for help
-async is forwarded to lavfi similarly to -af aresample=async=1:min_hard_comp=0.100000:first_pts=0.
    Last message repeated 1 times
Output #0, ffm, to 'http://10.100.102.109:8090/feed1.ffm':
  Metadata:
    creation_time   : now
    encoder         : Lavf57.83.100
    Stream #0:0: Audio: aac (LC), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      encoder         : Lavc57.107.100 aac
    Stream #0:1: Video: h264 (h264_nvenc) (Main), bgr0, 1920x1080, q=-1--1, 1500 kb/s, 8 fps, 1000k tbn, 8 tbc
    Metadata:
      encoder         : Lavc57.107.100 h264_nvenc
    Side data:
      cpb: bitrate max/min/avg: 1500000/0/1500000 buffer size: 3000000 vbv_delay: -1


  



  ****how can i replace the output that the video will be first ?****

  



  (when i do this command with 1 audio and 1 video inputs, the output is fine, the video is first , and the third part App can view it)

  



  i spent a lot of hours on it please help me.

  



  tnx a lot ...