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• Unable to link FFMpeg libraries in Visual studio 2012

  29 juin 2013, par Pferd

  I have been trying to link the FFMPEG static libraries to Visual studio 2012 in c++ environment. But i get the following error.

  • Error 1 error LNK1104 : cannot open file
    'avcodec.lib' C :\Users\username\Documents\Visual Studio
    2012\Projects\ConsoleApplication5\ConsoleApplication5\LINK ConsoleApplication5

  my lib files were located in C :\Users\username\Documents\Visual Studio 2012\Projects\ConsoleApplication5\ConsoleApplication5\ExtLib\lib

  The compile seems to be fine. The command line is

  • /Yu"stdafx.h" /GS /W3 /Zc:wchar_t
    /I"C :\Users\username\Documents\Visual Studio
    2012\Projects\ConsoleApplication5\ConsoleApplication5\ExtLib\include"
    /Zi /Gm /Od /sdl /Fd"x64\Debug\vc110.pdb" /fp:precise /D "WIN32" /D
    "_DEBUG" /D "_CONSOLE" /D "_UNICODE" /D "UNICODE" /errorReport:prompt
    /WX- /Zc:forScope /RTC1 /Gd /MTd /Fa"x64\Debug\" /EHsc /nologo
    /Fo"x64\Debug\" /Fp"x64\Debug\ConsoleApplication5.pch"

  The main issue seems to be at the linking stage where I have just not been able to get VS2012 to find my ffmpeg .lib files

  The linker command line is below :

  • /OUT :"C :\Users\username\Documents\Visual Studio
    2012\Projects\ConsoleApplication5\x64\Debug\ConsoleApplication5.exe"
    /MANIFEST /NXCOMPAT /PDB :"C :\Users\username\Documents\Visual Studio
    2012\Projects\ConsoleApplication5\x64\Debug\ConsoleApplication5.pdb"
    /DYNAMICBASE "avcodec.lib" "kernel32.lib" "user32.lib" "gdi32.lib"
    "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib"
    "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib"
    /DEBUG /MACHINE:X64 /OPT:NOREF /INCREMENTAL
    /PGD :"C :\Users\username\Documents\Visual Studio
    2012\Projects\ConsoleApplication5\x64\Debug\ConsoleApplication5.pgd"
    /SUBSYSTEM:CONSOLE /MANIFESTUAC :"level='asInvoker' uiAccess='false'"
    /ManifestFile :"x64\Debug\ConsoleApplication5.exe.intermediate.manifest"
    /ERRORREPORT:PROMPT /NOLOGO
    /LIBPATH :"/LIBPATH:C :\Users\username\Documents\Visual Studio
    2012\Projects\ConsoleApplication5\ConsoleApplication5\ExtLib\lib"
    /TLBID:1

  I cant figure out why the linker cant locate my ffmpeg lib files even though they are physically located in the /LIBPATH area - c :...\vs12...\ExtLib\lib

• how to convert HLS to RTMP with DISCONTINUITY tag

  21 août 2018, par bekks8

  We have software that produces concatenated HLS files. This concatenation is basically just playlist manipulation. We replace some parts of the manifest by other parts. To make the HLS valid we add a #EXT-X-DISCONTINUITY tag before and after the change :

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-TARGETDURATION:5
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXT-X-PLAYLIST-TYPE:VOD
  
  #EXTINF:4.0000,
  
  http://host/stream/1
  
  #EXT-X-DISCONTINUITY
  
  #EXTINF:4.0000,
  
  http://host/stream/2
  
  #EXTINF:4.0000,
  
  http://host/stream/3
  
  #EXTINF:4.0000,
  
  http://host/stream/4
  
  #EXTINF:4.0000,
  
  http://host/stream/5
  
  #EXTINF:4.0000,
  
  http://host/stream/6
  
  #EXTINF:0.2917,
  
  http://host/stream/7
  
  #EXT-X-DISCONTINUITY
  
  #EXTINF:4.0000,
  
  http://host/stream/8
  
  #EXT-X-ENDLIST

  In an HTML5 player above manifest will play just fine. Everything is in sync, audio and video play.

  Now, when i try and convert above to an rtmp format and stream this to a rtmp endpoint it works, but it stalls after about 4 seconds, than it continues missing 4 seconds, and runs fine after that.

  Basically, it plays part 1, skips 2, and continues with 3.

  I’ve checked the logs for ffmpeg which repeat :

  [flv @ 0x7fa696837c00] Non-monotonous DTS in output stream 0:1; previous: 3924, current: 0; changing to 3924. This may result in incorrect timestamps in the output file.
  
  [flv @ 0x7fa696837c00] Non-monotonous DTS in output stream 0:1; previous: 3924, current: 23; changing to 3924. This may result in incorrect timestamps in the output file.
  
  [flv @ 0x7fa696837c00] Non-monotonous DTS in output stream 0:1; previous: 3924, current: 46; changing to 3924. This may result in incorrect timestamps in the output file.

  After the DTS warnings ffmpeg reports that it dropped 95 frames :

  frame=  102 fps= 22 q=28.0 size=     181kB time=00:00:04.34 bitrate= 341.7kbits/s dup=0 drop=95 speed=0.958x

  This of course makes, sense, when i check with ffprobe i can see that the PTS isn’t aligned (which is expected) :

  frame|pkt_pts_time=5.316667|pkt_dts_time=5.316667|pict_type=B
  
  frame|pkt_pts_time=5.358333|pkt_dts_time=5.358333|pict_type=B
  
  frame|pkt_pts_time=5.400000|pkt_dts_time=1.400000|pict_type=P
  
  frame|pkt_pts_time=5.441667|pkt_dts_time=1.441667|pict_type=P
  
  frame|pkt_pts_time=1.483333|pkt_dts_time=1.483333|pict_type=I
  
  frame|pkt_pts_time=1.525000|pkt_dts_time=1.525000|pict_type=B
  
  frame|pkt_pts_time=1.566667|pkt_dts_time=1.566667|pict_type=B

  The 95frames, is exactly the number of frames with a PKT_PTS_TIME (and DTS) in the past.

  the ffmpeg command i use to create the RTMP stream is :

  ffmpeg -fflags +igndts -re -i http://host/manifest -c:v libx264 -force_key_frames "expr:gte(t,n_forced*2)" -c:a aac -ar 44100 -r 24 -f flv rtmp://domain/some/rtmp/endpoint

  What i’m looking for is a way to convert the HLS to a valid RTMP, without it skipping the frames with a PTS in the past. I would like it to just regenerate the PTS :
  Is there a way to tell ffmpeg to regenerate the PTS/DTS timestamps in it’s output file ?

• FFmpeg | "HTTP 404 not Found" "Failed to open an initialization section in playlist 0" "Error when loading first fragment, playlist 0"

  5 août 2020, par jas_123

  For some reason FFmpeg cant play the video I want. Im making a Discord bot with youtube-dl. My FFmpeg options are FFMPEG_OPTIONS = {'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5', 'options': '-vn'}

  


  Is there anything I need to change in my options ? Also, this only happens when youtube-dl says Downloading MPD manifest. Everything else works until that shows up.