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• avfilter/af_amix : Fix double-free of AVFilterChannelLayouts on error

  7 août 2020, par Andreas Rheinhardt

  avfilter/af_amix : Fix double-free of AVFilterChannelLayouts on error
  The query_formats function of the amix filter tries to allocate a list
  
  of channel layouts which are attached to more permanent objects
  
  (an AVFilter's links) for storage afterwards on success. If attaching
  
  a list to a link succeeds, the link becomes one of the common owners
  
  of the list. Yet if a list has been successfully attached to links (or if
  
  there were no links to attach it to in which case
  
  ff_set_common_channel_layouts() already frees the list) and an error
  
  happens lateron, the list was manually freed, which is wrong, because
  
  the list has either already been freed or it is owned by its links in
  
  which case these links' pointers to their list will become dangling and
  
  there will be double-frees/uses-after-free when these links are cleaned
  
  up automatically.
  This commit fixes this by removing the custom freeing code ; this is made
  
  possible by using the list in ff_set_common_channel_layouts() directly
  
  after its allocation (without anything that can fail in between).
  Notice that ff_set_common_channel_layouts() is buggy itself which can
  
  lead to double-frees on error. This is not fixed in this commit.
  Reviewed-by : Nicolas George <george@nsup.org>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavfilter/af_amix.c

• Cross origin issue in html 5 player

  2 septembre 2020, par Danish Abdul Hamid

  Hey Guys i am new this field i encoded video through ffmpeg and for packaging used bento 4 for output single file in ts below the command i used

  


  mp4hls —hls-version 4 —output-single-file —segment-duration 6 input_7000kb.mp4 input_5000kb.mp4 input_3500kb.mp4

  


  and this is output file http://stream.simpaisa.com/output/master.m3u8 when i open this url in html 5 player its showing error "not allowed by Access-Control-Allow-Headers in preflight response" but in android and vlc this url is working. server already have .htaccess file for cross origin allow .

  


  when i used this command mp4hls —hls-version 4 input_7000kb.mp4 input_5000kb.mp4 input_3500kb.mp4

  


  the output file is http://stream.simpaisa.com/new/output/master.m3u8 and this file is working in html 5 player no cross origin issue

  


  Please tell me whats the issue

  


  this is .htaccess file configuration

  


  Header set Access-Control-Allow-Origin "*"
Header set Access-Control-Allow-Credentials "true"
Header set Access-Control-Allow-Methods "GET,HEAD,OPTIONS,POST,PUT"
Header set Access-Control-Allow-Headers "Access-Control-Allow-Headers, Origin,Accept, X-Requested-With, Content-Type, Access-Control-Request-Method, Access-Control-Request-Headers"
RewriteEngine On

  


  RewriteCond %REQUEST_FILENAME !-f
RewriteRule ^(.*)$ index.php [QSA,L]

  


• FFMPEG with -vf yadif on progressive file produces incorrect 'Original Frame Rate' metadata double

  28 septembre 2020, par hedgehog90

  I've got an ffmpeg command that I often use, I incorporate the yadif argument for content that may or may not be interlaced :

  


  ffmpeg -i input.mkv -c copy -c:v hevc_nvenc -c:a:0 aac -b:a 192k -vf yadif=mode=1:deint=1 output.mkv

  


  This means if input.mkv is an interlaced video, I get double the frame rate and the footage is deinterlaced, and if it's progressive it remains so and the frame rate doesn't change, exactly as I want it.

  


  However, I've just noticed in Mediainfo that progressive videos processed by this command, it adds this mysterious "Original Frame Rate" tag (I assume it's just metadata)

  


  

  


  It doesn't appear to affect playback in VLC or MPV, however it is recognized in MPV as 'framerate (Specified)'...

  


  How do I prevent ffmpeg from generating this tag when using the yadif filter ?