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• Multiples Cameras Rttsp to HLS [closed]

  15 mai 2024, par Dark Dragon

  Is it possible to create a media server that will have just one endpoint that will receive several requests with camera protocols, and this server must return the stream from these cameras formatted ?
Knowing that the front end will take these camera streams and place them in the browser

  


  I Still searching about the subject

  


• dts to m4a (aac) encoding - qaac, neroaacenc encoder output issues

  9 avril 2014, par user8979

  greets

  I want to encode a dts 5.1 audio source to m4a (aac) 5.1 with same playback duration.
  Intend to use either qaac or neroAacEnc.

  The output is the same per encoder with .mkv and .dts extracted from .mkv as input audio source.
  .mkv source piped to encoder using ffmpeg
  .dts source piped to encoder using ffmpeg and wavi with .avs input, .avs using NicAudio avisynth plugin, to decode .dts source for separate encodes to confirm if challenges encountered were from ffmpeg or elsewhere (both produced the same issues so concluded the issues originated from the respective encoders)

  • qaac output is same duration as .mkv
    issues : mediainfo reports output is 2ch while mediatab and ffmpeg report output is 5.1ch (lfe)

    mediainfo :

    Channel(s) : 2 channels
    Channel(s)_Original : 6 channels
    Channel positions : Front : L C R, Side : L R, LFE
    this channel position and channel combination is not possible, so which is it ?

    ffmpeg (5.1 info bold) :

    Stream #0:0(und) : Audio : aac, 5.1, fltp

    mediatab :

    Channel(s) : 6 channels
    ChannelPositions : Front : L C R, Side : L R, LFE

  • neroaacenc output has same channels, 5.1
    issue : ffmpeg reports output is longer than mkv audio track by 0.06 seconds (60 ms) and it begins after 0.054677 seconds (54.667 ms)

    Chapter #0.0 : start 0.054667

  Questions :

  1. qaac output
     
     • is the output stream 2ch or 5.1ch ?
     • if it is 2ch, what qaac option(s) leave the channels in output same as input AND report the correct channels ?
     • if the output is 5.1ch, does this mean every qaac output keeps the input channels (without using —chanmap or other such options) ? if so then its easy to ignore mediainfo channel information for qaac encodes.
       
       • why did mediainfo report 2ch ? could the stream report incorrect channels to a media player (implies incorrect playback) ? is there any way to get rid of the misleading channel information shown in mediainfo ? (expecting the information to be stored in the file, that is where would like to get rid of it)
  2. neroaacenc output
     • how can one ensure neroaacenc output is exact same duration as input ?
     • if not possible to change the output duration, does that mean when muxing audio with video, include the 54.667 ms delay to maintain sync ? (audio delay of -0.054667 s in this case) ?

  Commandlines were many so not included. Let me know if they would be helpful.

• Compiling FFMpeg Error — Need to recompile something with -fPIC, but don't know where the thing is

  1er mai 2014, par nectaris

  I’m trying to compile FFMpeg with make after running ./configure --enable-shared --enable-pic, but am getting the following error, which stops completion of the compilation :

  /usr/bin/ld: libavutil/intfloat_readwrite.o: relocation R_X86_64_PC32 against undefined symbol ldexp@@GLIBC_2.2.5' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: Bad value

  I know I need to recompile something with -fPIC as indicated, but I’m not sure exactly what needs to be recompiled. I know that -fPIC is an option of GCC, but again, I just need a shove in the right direction as to what actual files need to be recompiled. Or should I modify the Makefile ?

  I apologize if the answer’s right in front of me or something — this is rather new territory.