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• Revision 527fc5caf6 : Fix loopfilter bug In the rare case were 4x4 interior filtering was called for

  9 juillet 2013, par John Koleszar

  Changed Paths :
   Modify /test/test-data.sha1

  
   Modify /test/test.mk

  
   Modify /test/test_vector_test.cc

  
   Modify /vp9/common/vp9_loopfilter.c

  
  
  Fix loopfilter bug

  In the rare case were 4x4 interior filtering was called for but no
  8x8 or larger filtering takes place, the previous code was skipping
  the filtering. This patch fixes the issue by including the interior
  mask in the overall mask for the filter application loops.

  Change-Id : I4a0b65056c64f97478827c2ff41e0914fc7779d0

• PermissionError : [Errno 13] Permission denied : 'ffprobe' (AudioSegment)

  22 juin 2022, par AYA

  I am trying to get AudioSegment working on my local computer. After resolving some issues, I am stuck on a permission error that I cannot seem to resolve. Let me detail what I have done so far (so that the error is easy to detect) :

  


  I pip installed both ffprobe and ffmpeg. But when I import ffprobe, it raised ImportError: cannot import name 'FFProbe'. Thankfully, was able to fix it following a brilliant post here. But now when I run audio = AudioSegment.from_file(audioname), it raises the following error : PermissionError: [Errno 13] Permission denied: 'ffprobe'. Based on one of the comments here, I manually adjusted the permissions using (which I think is the maximum permission granted to a folder ?) :

  


  import os
import stat
os.chmod('/path/to/ffmpeg', stat.S_IRWXU)
os.chmod('/path/to/ffprobe', stat.S_IRWXU) 


  


  Just to be 100% sure, I then manually adjusted the permissions for all the files in ffmpeg and ffprobe folders using stat.S_IRWXU, but to no avail (also tried chmod 755). I also confirmed if execution permission was actually granted (using os.access(my_file, os.X_OK)) but still get the same error. (Also changed the permission for the .mp3 file, no luck)

  


  Additional details :

  


  

  1. Based on a suggestion somewhere, I also added the following options right after importing AudioSegment :

  


  


  AudioSegment.converter = "/path/to/ffmpeg"
AudioSegment.ffmpeg = "/path/to/ffmpeg"
AudioSegment.ffprobe = "/path/to/ffprobe"


  


  

  2. There is also a runtime warning (that I don't think has anything to do with the error I get) but mentioning it here for completion :

  


  


  /opt/anaconda3/lib/python3.8/site-packages/pydub/utils.py:198: RuntimeWarning: Couldn't find ffprobe or avprobe - defaulting to ffprobe, but may not work
  warn("Couldn't find ffprobe or avprobe - defaulting to ffprobe, but may not work", RuntimeWarning)


  


  Thanks !

  


• Reduce HLS latency from +30 seconds

  4 juin 2014, par Rick

  Ubuntu 12.04

  nginx 1.2.4

  avconv -version

  avconv version 0.8.10-4:0.8.10-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
  
    built on Feb  6 2014 20:56:59 with gcc 4.6.3
  
  avconv 0.8.10-4:0.8.10-0ubuntu0.12.04.1
  
  libavutil    51. 22. 2 / 51. 22. 2
  
  libavcodec   53. 35. 0 / 53. 35. 0
  
  libavformat  53. 21. 1 / 53. 21. 1
  
  libavdevice  53.  2. 0 / 53.  2. 0
  
  libavfilter   2. 15. 0 /  2. 15. 0
  
  libswscale    2.  1. 0 /  2.  1. 0
  
  libpostproc  52.  0. 0 / 52.  0. 0

  I’m using avconv and nginx to create an HLS stream but right now my latency is regularly well over 30 seconds. After much reading I am aware that HLS has built in latency and that 10s is expected and even preferred but 30s seems quite extreme.

  I’ve seen a lot of discussion on the nginx-rtmp google group, this thread in particular had a lot of suggestions. I have attempted to reduce solve my issue by reducing the hls_fragment and the hls_playlist_length but they haven’t had a significant effect.

  nginx.conf :

  #user  nobody;
  
  worker_processes  1;
  
  
  
  error_log  logs/error.log debug;
  
  
  
  events {
  
      worker_connections  1024;
  
  }
  
  
  
  http {
  
      include       mime.types;
  
      default_type  application/octet-stream;
  
  
  
      sendfile        on;
  
      keepalive_timeout  65;
  
  
  
      server {
  
          listen       8888;
  
          server_name  localhost;
  
  
  
          add_header 'Access-Control-Allow-Origin' "*";
  
  
  
          location /hls {
  
              types {
  
                  application/vnd.apple.mpegurl m3u8;
  
                  video/mp2t ts;
  
              }
  
              root /tmp;
  
          }
  
  
  
          # rtmp stat
  
          location /stat {
  
              rtmp_stat all;
  
              rtmp_stat_stylesheet stat.xsl;
  
          }
  
          location /stat.xsl {
  
              # you can move stat.xsl to a different location
  
              root /usr/build/nginx-rtmp-module;
  
          }
  
  
  
          # rtmp control
  
          location /control {
  
              rtmp_control all;
  
          }
  
  
  
          error_page   500 502 503 504  /50x.html;
  
          location = /50x.html {
  
              root   html;
  
          }
  
      }
  
  }
  
  
  
  rtmp {
  
      server {
  
          listen 1935;
  
          ping 30s;
  
          notify_method get;
  
  
  
          application myapp {
  
              live on;
  
  
  
              hls on;
  
              hls_path /tmp/hls;
  
              hls_base_url http://x.x.x.x:8888/hls/;
  
              hls_sync 2ms;
  
              hls_fragment 2s;
  
  
  
              #hls_variant _low BANDWIDTH=160000;
  
              #hls_variant _mid BANDWIDTH=320000;
  
              #hls_variant _hi BANDWIDTH=640000;
  
          }
  
      }
  
  }

  avconv command :

  avconv -r 30 -y -f image2pipe -codec:v mjpeg -i - -f flv -codec:v libx264 -profile:v baseline -preset ultrafast -tune zerolatency -an -f flv rtmp://127.0.0.1:1935/myapp/mystream