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• mp4 to hls ffmpeg during upload to Google storage

  13 février 2018, par Sofiia Vynnytska

  I have an API written on Java, which is used for uploading mp4 videos on front-end. We store those videos on google cloud and our application is running in google cloud. For Android clients, we need to convert uploaded videos to hls. Unfortunately, Google cloud does not have transcoder for videos and I need to convert video in another way. I found that ffmpeg can do this. But I cannot find a good solution for this and I need an advice.
  One of ideas is to deploy cloud function on google cloud, which will convert mp4 to hls after uploading video. Can I need to upload this m3u8 and ts videos to storage ? Will be this approach okay ? Is there any other possible solution ?

• FFMPEG mp4 input on android

  2 juin 2017, par DweebsUnited

  I have been banging my head against the wall on this for a while now. I need to trim part of an mp4 file, using ffmpeg on android. I have ffmpeg compiled, linked, and I can confirm that it works as expected in my ndk calls. What I am running into is getting an mp4 file to ffmpeg in a protocol it can actually work with.

  Right now, I have a Uri for the file that I get a ParcelFileDescriptor from. I pass its file descriptor to an ndk call that does all the ffmpeg processing using the pipe protocol. Issue : ffmpeg cannot read an mp4 over the pipe protocol, because it needs to seek back to the start once it finds the moov atom.

  All I’m doing is remuxing the videos. I’m not doing any heavy work, or more complicated ffmpeg calls

  Attempted solution : Set up custom AVio calls that open the descriptor as a file stream, and handle it that way. Issue : file descriptor from java is not seekable, it’s more of a stream.

  Possible solution : Preprocess videos to have the moov atom at the front. Issue : Not allowed, the files come from somewhere I cannot control.

  Possible solution : Run one call to find all the file information, then another to actually remux the file. Issue : I don’t know what I need to save from the first parse through to make this possible. Just the moov atom ? Can I just replace the io object in the first call’s inputFormatContext with a new one in the second call ? Can I pass it two distinct file descriptors, both to the same file, and not have to make two ndk calls ?

  Any help or ideas you can offer is greatly appreciated.

• QT ffmpeg Setting

  20 juillet 2016, par user775668

  I can’t use the ffmpeg in QT.

  My Steps :

  -1. compile the ffmpeg as normal

  -2. add lib/include path in QT .pro

  LIBS += -L/home/kim/ffmpeg/lib -lavcodec -lavformat
  
  INCLUDEPATH += /home/kim/ffmpeg/include

  -3. in code

  extern "C" { 
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  }

  and just call a function named av_register_all() ;

  then I got the following bulid issues< many functions undefined reference >

  in function `rl2_read_packet`: undefined reference to `av_free_packet`
  
  in function `av_register_all`: ....

  I search a solution of the problem but not work for me.

  Any other solution ? Thanks.