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• avformat/tls_schannel : immediately return decrypted data if available

  12 mai 2020, par Jan Ekström

  avformat/tls_schannel : immediately return decrypted data if available
  Until now, we would have only attempted to utilize already decrypted
  
  data if it was enough to fill the size of buffer requested, that could
  
  very well be up to 32 kilobytes.
  With keep-alive connections this would just lead to recv blocking
  
  until rw_timeout had been reached, as the connection would not be
  
  officially closed after each transfer. This would also lead to a
  
  loop, as such timed out I/O request would just be attempted again.
  By just returning the available decrypted data, keep-alive based
  
  connectivity such as HLS playback is fixed with schannel.
  

  • [DH] libavformat/tls_schannel.c

• HLS streaming always starts from the beginning in Android Browser

  20 août 2015, par Cesar Zhou

  Problem

  HLS streaming works well in iOS browser(real time mid-stream),

  But in most of Android browser, the streaming always starts from the beginning(First Ts file when streaming started).

  Reference

  • Android System：4.0,4.4,etc..

  • Detail for FFmpeg command : Pull RTMP streaming, then use segment to transfer that into TS splits.

    ffmpeg -re -i rtmp://ipaddress/live/streamname
-codec:a libfaac -b:a 96k -af volume=1 -ac 2 -ar 44100
-f segment
-segment_time 5
-segment_list_flags live
-segment_list /path/to/m3u8
-segment_format mpegts /path/to/ts

  • Detail for m3u8 file

    #EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:0
#EXT-X-ALLOW-CACHE:NO
#EXT-X-TARGETDURATION:6
#EXTINF:5.000278,
file0000.ts
#EXTINF:5.013356,
file0001.ts4

  • HLS Player：Ckplayer + m3u8 plugins

  Help

  Does anyone else meet this problem ?

• Recording video with unknown framerate with FFmpeg

  24 juillet 2017, par Chris

  I am recording video with FFmpeg and I would like the frame rate it is written with to at least be in the right ballpark. Right now I take the frame rate that my input claims to have and use that to set the frame rate (time_base) for my output video stream. However this is sometimes wildly different from the actual frame rate that I am getting (I have seen a stream claiming 50 fps but publishing at 9 fps).

  What I would like to do is use a elapsed timer and count the frames I record to calculate the actual frame rate I recorded at when I am finished recording. I would seem though that the frame rate is set in my AVStream is used in avcodec_open2 before I write any frames. If I set it later (such as while I am writing frames) while ffplay can play it (complaining that the time increment bits is 6 not 4) other video players cannot. Is there a way to set the frame rate for the whole file after writing the frames ? If not is there a way to tell the frames themselves some sort of timestamp or frame rate while I am recording that will result in a valid recorded file ?