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• avformat_write_header() doesn't work when writing data to memory instead of file

  12 novembre 2020, par Mohamed Kandeel

  i want to resample a given input format from memory to memory everything is good so far.

  


  but when trying to get the output header from ffmpeg it doesn't work.

  


  here i allocate the context and pass the write_buffer function pointer so that it doesn't write to a file but instead it will call my function with the required data

  


  unsigned char * aviobuffer = (unsigned char *) av_malloc (32768);
AVIOContext * avio = avio_alloc_context (aviobuffer, 32768,1, NULL, NULL, write_buffer, NULL);

AVFormatContext* containerContext;
avformat_alloc_output_context2(&containerContext, NULL, "s16le", NULL);
containerContext->pb = avio;


  


  here is my write_buffer function

  


  std::vector<char>* data;&#xA;int write_buffer(void *opaque, uint8_t *buf, int buf_size)&#xA;{&#xA;    std::vector<char> tmp;&#xA;    tmp.assign(buf, buf &#x2B; buf_size);&#xA;    data->insert(data->end(), tmp.begin(), tmp.end());&#xA;    return buf_size;&#xA;}&#xA;</char></char>

  


  now when i call avformat_write_header() it doesn't call my write_buffer() function + it returns 0 which means success.

  


  int ret = avformat_write_header(containerContext, NULL);


  


  after that i call the appropriate functions to get the data body itself and my write_buffer() get called normally so i am now left with the data body with no header !!

  


  how can i get the output header anyways ?

  


• ffmpeg, twitch.tv, doesnt work

  7 novembre 2015, par John Smith

  Im using this command for streaming :

  ffmpeg -f dshow -i video="screen-capture-recorder" -f dshow -i audio="Mikrofon (USB audioeszköz)" -f dshow -i audio="virtual-audio-capturer" -f dshow -i audio="Mikrofon (Conexant SmartAudio H" -vcodec libx264 -r 25 -crf 0 -acodec aac -strict -2 -filter_complex amix=inputs=3:duration=first -pix_fmt yuv420p -s 640x480 -preset fast -f flv "rtmp ://live.twitch.tv/app/live_**********"

  if I save it to disk, it works. Streaming to twitch.tv also wont give error, but it just stays blank, it cannot see it "alive"

• 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 ?