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• How to cross-compile ffmpeg for arm on Mac using clang

  13 juin 2018, par CoXier

  As title says, I want to cross compile FFmpeg using clang. Here is part of my configure.

   ./configure --cross-prefix=${TOOLCHAIN}/bin/arm-linux-androideabi-

  The var TOOLCHAIN is tool chain dir. After configured, the output is.

   C compiler                toolchains/bin/arm-linux-androideabi-gcc
  
   C library                 bionic
  
   host C compiler           gcc
  
   host C library            

  I want to change compiler to clang. So I export CC=${TOOLCHAIN}/bin/clang. However the configuration is keeping gcc. How can I use clang and clang++ compiler.

  Thanks in advance.

• avutil/hcontext_cuda : Remove unnecessary stream synchronisation

  30 mars 2019, par Philip Langdale

  avutil/hcontext_cuda : Remove unnecessary stream synchronisation
  Similarly to the previous changes, we don't need to synchronise
  
  after a memcpy to device memory. On the other hand, we need to
  
  keep synchronising after a copy to host memory, otherwise there's
  
  no guarantee that subsequent host reads will return valid data.
  

  • [DH] libavutil/hwcontext_cuda.c

• Unable to get nginx-vod-module plugin to work

  31 octobre 2020, par AAP

  My first time trying hands on nginx-vod-module or any video streaming for that matter.
I just want to play static mp4 videos which I place on the server but via hls instead of direct mp4 access. No actual live streaming

  


  Q1. Am I right in understanding that a mp4 video which I place locally on my server, will automatically get broken down into segments for HLS ?

  


  My nginx installation is here : /opt/kaltura/nginx
The mp4 file is placed at /opt/kaltura/nginx/test/vid.mp4

  


  In ../nginx/conf/server.conf, I have this :

  


  location /hls/ {
            alias test/;
            vod hls;
            vod_bootstrap_segment_durations 2000;
            vod_bootstrap_segment_durations 2000;
            vod_bootstrap_segment_durations 2000;
            vod_bootstrap_segment_durations 4000;

            include /opt/kaltura/nginx/conf/cors.conf;
        }
location / {
            root   html;
        }


  


  Now, I am able to access the m3u8 file :
curl http://104.167xxxxx/hls/vid.mp4/index.m3u8

  


  But when I try to open this file via VLC, I see these errors in errors.log :

  


  *2020/10/31 15:00:08 [error] 12749#0: *60 mp4_parser_validate_stsc_atom: zero entries, client: 49.207 ..., server: ubuntu, request: "GET /hls/vid.mp4/seg-1-v1.ts HTTP/1.1", host: "104.167. ..."
2020/10/31 15:00:08 [error] 12752#0: *61 mp4_parser_validate_stsc_atom: zero entries, client: 49.207 ..., server: ubuntu, request: "GET /hls/vid.mp4/seg-2-v1.ts HTTP/1.1", host: "104.167. ..."
2020/10/31 15:00:09 [error] 12749#0: *62 mp4_parser_validate_stsc_atom: zero entries, client: 49.207 ..., server: ubuntu, request: "GET /hls/vid.mp4/seg-3-v1.ts HTTP/1.1", host: "104.167. ..."
2020/10/31 15:00:10 [error] 12751#0: *63 mp4_parser_validate_stsc_atom: zero entries, client: 49.207 ..., server: ubuntu, request: "GET /hls/vid.mp4/seg-4-v1.ts HTTP/1.1", host: "104.167. ..."*


  


  Q2 : Is https must for this to work ?
Q3 : I dont see any /hls/vid.mp4 folder created anywhere on the server. Do I have to manually run ffmpeg separately to create the hls segments ?

  


  What wrong am I doing ?