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  • RTMP stream and bandwidth usage

    5 mai 2015, par Mike Sanchez

    As of now, I have an RTMP live stream going. FFMPEG transcodes the video files on my server, and then I direct it to LiveStream.com’s RTMP service. I use this method because my server just doesn’t have enough bandwidth to support numerous users watching the same stream all at once.

    Livestream currently acts as a middle-man for me. So my question is, are there other opensource options wherein I can put Livestream to rest ? Can video.js handle this ? Maybe even Castamp ? Or do I risk losing the ability to keep bandwidth under control without an option like the one I’m currently using ?

  • x86 : Faster high bit-depth intra_sad_x3_4x4

    1er mai 2013, par Henrik Gramner
    x86 : Faster high bit-depth intra_sad_x3_4x4
    

    20->16 cycles on Ivy Bridge

    • [DH] common/x86/sad16-a.asm
    • [DH] encoder/analyse.c
  • x86/tx_float : replace fft_sr_avx with fft_sr_fma3

    20 mai 2022, par Lynne
    x86/tx_float : replace fft_sr_avx with fft_sr_fma3
    

    When the SLOW_GATHER flag was added to the AVX2 version, this
    made FMA3-features not enabled on Zen CPUs.
    As FMA3 adds 6-7% across all platforms that support it, in
    the interest of saving space, this commit removes the AVX
    version and replaces it with an FMA3 version.
    The only CPUs affected are Sandy Bridge and Bulldozer, which
    have AVX support, but no FMA3 support.
    In the future, if there's a demand for it, a version of the
    function duplicated for AVX can be added.

    • [DH] libavutil/x86/tx_float.asm
    • [DH] libavutil/x86/tx_float_init.c