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Sur d’autres sites (4762)

  • ffmpeg - Have troubling syncing up audio and video together

    15 février 2017, par zyeek

    I have a webcam and a separate mic. I want to record what is happening.

    It almost works, however the audio seems to play quickly and parts missing while playing over the video.

    This is the command I am currently using to get it partially working

    ffmpeg -thread_queue_size 1024 -f alsa -ac 1 -i plughw:1,0 -f video4linux2 -thread_queue_size 1024 -re -s 1280x720 -i /dev/video0 -r 25 -f avi -q:a 2 -acodec libmp3lame -ab 96k out.mp4

    I have tried other arguments, but unsure if it has to do with the formats I am using or incorrect parameter settings.

    Also, the next part would be how to stream it. Everytime I try going through rtp it complains about multiple streams. I tried doing html as well, but didn’t like the format. html html://localhost:50000/live_feed or rts rts://localhost:5000

    edit :

    I am running this on a rpi 3.

  • Mac App (Cocoa) for producing HTTP Live Streaming

    11 mars 2013, par Michael

    I am building a Mac OS X application (Cocoa) with XCode that captures a video source and outputs the video through HTTP Live Streaming (HLS). After doing a fair amount of research I am thinking that I should be able to use the following stack of elements in my app to make this happen...

    • AVCaptureDevice
    • AVCaptureSession
    • AVCaptureVideoDataOutput
    • FFMPEG
    • mediastreamsegmenter
    • CocoaHTTPServer

    I would really appreciate some feedback as to whether I'm on the right track, or correction if I am mistaken. Obviously any advice, pointers, perhaps some sample code snippets would be so very helpful.

    Many thanks in advance !

  • aacenc_tns : rework TNS descision logic

    17 octobre 2015, par Rostislav Pehlivanov
    aacenc_tns : rework TNS descision logic

    Changes :
    
 - strongly prefer dual filters to a single filter
    
 - less strict about using 2 filters w.r.t. energy
    
 - scrap the usage of threshold and spread, useless
    
 - use odd-shaped windows to set the filter direction
    
 - use 4 bits instead of 3 bits for short windows
    
 - simplify and reduce the main loop to a single level
    
 - add stricter regulations for short windows
    

    All of this now makes the TNS implementation operate
    
as good as it can and it definitely shows. The frequency
    
thresholds are now even better defined by looking at
    
the spectrals and the overall sound has been improved at
    
the price of just a few bits that are well worth it.
    • [DH] libavcodec/aacenc_tns.c
    • [DH] libavcodec/aacenc_tns.h

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