HLS keepalive: too many requests

Hi,

I regularly stream videos using FFmpeg-based players (QMPlay2 & mpv) from a site that FFmpeg doesn't handle too politely, as suggested by the flow of errors like these:


```
> ffmpeg8 -hide_banner -fflags +igndts -i "https://URL/1080p.m3u8?OPTS" -y -acodec copy -vcodec copy /tmp/kk.mp4 |& fgrep -v "Invalid timestamps"
mime type is not rfc8216 compliant
[in#0 @ 0xfa27700] Opening 'https://URL/1080p/mkugvdY.ts?OPTS' for reading
[in#0 @ 0xfa27700] Opening 'https://URL/1080p/nVvlYSee9v.ts?OPTS' for reading
Input #0, hls, from 'https://URL/1080p.m3u8?OPTS':
  Duration: 00:59:46.42, start: 0.111111, bitrate: 0 kb/s
  Program 0 
    Metadata:
      variant_bitrate : 0
  Stream #0:0[0x0]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp, start 0.111111
    Metadata:
      variant_bitrate : 0
  Stream #0:1[0x0]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn, start 0.111111
    Metadata:
      variant_bitrate : 0
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
  Stream #0:0 -> #0:1 (copy)
Output #0, mp4, to '/tmp/kk.mp4':
  Metadata:
    encoder         : Lavf62.12.102
  Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 23.98 fps, 23.98 tbr, 90k tbn
    Metadata:
      variant_bitrate : 0
  Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp
    Metadata:
      variant_bitrate : 0
Press [q] to stop, [?] for help
[https @ 0x10205ec0] Opening 'https://URL/1080p/k1AaLmI1mja.ts?OPTS' for reading
[https @ 0x1032a7c0] Opening 'https://URL/1080p/QW7Rw5sqKYe.ts?OPTS' for reading
[https @ 0x10205ec0] Opening 'https://URL/1080p/2rOMJ9hOnny.ts?OPTS' for reading
[https @ 0x1032a7c0] Opening 'https://URL/1080p/gZGKg8SWWrW.ts?OPTS' for reading
[https @ 0x10205ec0] Opening 'https://URL/1080p/1amwzASa8jj.ts?OPTS' for reading
[https @ 0x1032a7c0] Opening 'https://URL/1080p/4OP94MUqx18.ts?OPTS' for reading
[https @ 0x10205ec0] Opening 'https://URL/1080p/73aXlPI2405.ts?OPTS' for reading
[https @ 0x1032a7c0] Opening 'https://URL/1080p/qylqMGhzRV5.ts?OPTS' for reading
[https @ 0x10205ec0] Opening 'https://URL/1080p/rx2W8gh4AKQ.ts?OPTS' for reading
[https @ 0x10374f00] HTTP error 429 Too Many Requests
[in#0/hls @ 0xfa27700] keepalive request failed for 'https://URL/1080p/rx2W8gh4AKQ.ts?OPTS' with error: 'Server returned 429 Too Many Requests' when opening url, retrying with new connection
[in#0/hls @ 0xfa27700] Opening 'https://URL/1080p/rx2W8gh4AKQ.ts?OPTS' for reading
[https @ 0x1032a7c0] Opening 'https://URL/1080p/nMOqgMiL718.ts?OPTS' for reading
[https @ 0x1009dec0] HTTP error 429 Too Many Requests
[in#0/hls @ 0xfa27700] keepalive request failed for 'https://URL/1080p/nMOqgMiL718.ts?OPTS' with error: 'Server returned 429 Too Many Requests' when opening url, retrying with new connection
[in#0/hls @ 0xfa27700] Opening 'https://URL/1080p/nMOqgMiL718.ts?OPTS' for reading
[https @ 0x7fc0900769c0] HTTP error 429 Too Many Requests
[in#0/hls @ 0xfa27700] Failed to open segment 11 of playlist 0
[in#0/hls @ 0xfa27700] Opening 'https://URL/1080p/nMOqgMiL718.ts?OPTS' for reading
[https @ 0x7fc090016580] HTTP error 429 Too Many Requests.89 bitrate=3489.9kbits/s speed=30.9x elapsed=0:00:02.00    
[in#0/hls @ 0xfa27700] Failed to open segment 11 of playlist 0
[in#0/hls @ 0xfa27700] Opening 'https://URL/1080p/nMOqgMiL718.ts?OPTS' for reading
[https @ 0x7fc090009dc0] Opening 'https://URL/1080p/3boXZnswVo1.ts?OPTS' for reading
[https @ 0x7fc090071480] Opening 'https://URL/1080p/nbjo9MuaWrw1.ts?OPTS' for reading
[https @ 0x7fc090009dc0] Opening 'https://URL/1080p/jrK6x8IVyyL.ts?OPTS' for reading
[https @ 0x7fc090009980] HTTP error 429 Too Many Requests
[in#0/hls @ 0xfa27700] keepalive request failed for 'https://URL/1080p/jrK6x8IVyyL.ts?OPTS' with error: 'Server returned 429 Too Many Requests' when opening url, retrying with new connection
[in#0/hls @ 0xfa27700] Opening 'https://URL/1080p/jrK6x8IVyyL.ts?OPTS
```

To date I haven't seen these on other sites, and I cannot easily share streaming links because they're specific to my IP address.

I remember trying to understand the HLS streaming code a while back and getting the impression that it does have some mechanism to adapt or otherwise modify the request interval, but I can't seem to find that now.

Does FFmpeg have any provision to deal with this kind of situation and if so, what API is there control it?

Thanks,
R.
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