Recherche avancée

Sur d’autres sites (7163)

• cocoa ffmpeg streaming created improper file

  18 octobre 2016, par Swati

  I am trying to capture video stream and upload it to RTMP server using FFMPEG in my cocoa app. I am able to play that file via FFPLAY but when i stop streaming file is not created properly.

  It shows file size as 1kb even when streaming is done for 5 mins.

  However if i try to save on my local system it works fine. A proper file is created and i am able to view it.

  RTMP server is also fine coz from windows files are being created and saved on that server.

  Thanks in advance. :)

• Sending periodic metadata in fragmented live MP4 stream ?

  20 septembre 2022, par El Sampsa

  As suggested by the topic, I'm wondering if it's possible to send metadata about the stream contents periodically in a fragmented MP4 live stream.

  



  I'm using the following command (1) to get fragmented MP4 :

  



  ffmpeg -i rtsp://admin:12345@192.168.0.157 -c:v copy -an -movflags empty_moov+omit_tfhd_offset+frag_keyframe+default_base_moof -f mp4 ...


  



  My main program reads the fragments from this command from either stdout or from a (unix domain) socket and gets :

  



  ftyp
moov
moof
mdat
moof
mdat
moof
mdat 
...


  



  So, the first fragments I get are ftyp and moov which are metadata and describe the stream contents.

  



  Now a client program connects at a later time to the main program. The problem is, that at that point, the ftype and moov fragments are long gone.

  



  Is there a way (=ffmpeg command option) to make this work similar to MPEGTS (aka mpeg transport stream), and resend metadata periodically with the stream ? Like this :

  



  ftyp
moov
moof
mdat
moof
mdat
moof
mdat 
ftyp
moov
moof
mdat
moof
mdat
moof
mdat 
...


  



  .. or is my only option to cache the ftyp and moov packets in my main program and re-send them to the client program when it requests the stream ?

  



  A related link : What exactly is Fragmented mp4(fMP4) ? How is it different from normal mp4 ?

  



  Caching and resending ftyp and moov each time a new client connects is not that straightforward either .. as it somehow brokes the stream (at least the browser MSE extensions don't like such a stream). There seems to be lots of sequence numbers and stuff in the moof packets that should be modified. (+)

  



  Another option is to pass the stream through another FFmpeg process that does the remuxing (and corrects moof packets). Things are further complicated by the fact that command (1) does not give cleanly-separated ftyp, moov, moof, etc. packets.

  



  Any thoughts / solutions appreciated.

  



  EDIT : regarding (+), MSE seems to have problems playing fragmented MP4 with gaps : https://bugs.chromium.org/p/chromium/issues/detail?id=516114

  


• Best tool to convert mp3 to aac (FFmpeg Vs NeroAacEnc) [closed]

  3 août 2012, par Soham Dasgupta

  My question is straight forward. I want to convert mp3 to aac. I have knowledge of two such tools which does the job - NeroAacEnc and FFMpeg. Now which one produces the best output and least size is for maestros to answer, so I summon them here to help me accomplish the same. Please also help me with some commands with which I can use.

  Just out of curiosity, is the (ALAC)Apple Lossless Audio Codec which is included with FFMpeg better than Nero Aac Encoder. If so, then how can I use it to convert mp3 to aac.