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• rtmpproto : Validate the embedded flv packet size before copying

  3 octobre 2013, par Martin Storsjö

  rtmpproto : Validate the embedded flv packet size before copying
  This wasn’t an issue prior to 58404738, when the whole RTMP packet
  
  was copied at once and the length of the individual embedded flv
  
  packets only were validated by the flv demuxer.
  Prior to this patch, this could lead to reads and writes out of bound.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] libavformat/rtmpproto.c

• How to match precompiled static library's debugging symbols to source code with Xcode 5 ?

  21 septembre 2013, par Chris Ballinger

  I have to compile FFmpeg for iOS using an external build script, but when I am debugging I see assembler if I delve too deep into libavformat library functions :

  0x109a73:  cmpl   $0, 1192(%ebp)
  
  0x109a7a:  jns    0x109a86                  ; mov_write_header + 198 at movenc.c:3539
  
  0x109a7c:  movl   $1, 1192(%ebp)
  
  0x109a86:  movl   16(%ebp), %eax
  
  0x109a89:  cmpl   $0, 84(%eax)
  
  0x109a8d:  movl   %edx, %ecx
  
  0x109a8f:  jne    0x109ad9                  ; mov_write_header + 281 at movenc.c:3548
  
  0x109a91:  testb  $2, 48(%ecx)
  
  0x109a95:  jne    0x109ac1                  ; mov_write_header + 257 at movenc.c:3541

  There are clear debugging symbols left behind which would lead me to believe that there should be some way to tell Xcode the location of this source code to allow easier debugging.

  Is this even possible ?

  edit : I found a related question here No symbols/source for external library in Xcode 4

  So when I run xcrun dwarfdump libavformat.a | grep "\.c" I get a bunch of results like this :

  AT_decl_file( "libavformat/movenc.c" )

  So I tried putting the relevant source files in folders relative to both the .a file and my .xcodeproj file, but neither of those methods worked. Full source code is available here : https://github.com/openwatch/livestreamer-ios

  edit2 : I found another question about how to set the source mapping for lldb but I'm not quite sure what to do... LLDB equivalent of gdb "directory" command for specifying source search path ?

  It seems like I might need to do

  (lldb) settings set target.source-map libavformat/movenc.c /path/to/libavformat/movenc.c 

  for every file I need ?

• delay in audio sync after converting ac3 to aac

  9 mars 2018, par samer metwally

  I have a MKV video consist of a video and an audio of duration 10 minutes, after using ffmpeg to extract ac3 to aac audio, its duration became 10:50, which lead to audio out of sync with the video after packaging the new extracted audio to mp4 container using mp4box. how to solve the problem of syncing or as i knew, the delay that happen with aac encoding ?
  commands :

  ffmpeg -i "d:/input.mkv" -vn -c:a aac "d:/audio.aac"
  
  
  
  MP4Box 
  
  -add "C:/1280x720.264" 
  
  -fps "23.976023976024"
  
  -add "d:/audio.aac:lang=ara"