When using the M3U output from one DVR as a custom source for another DVR, the "codec=copy" parameter seems to be ignored completely. When starting playback it will sometimes transcode at 2Mb and others at 8Mb even when the original bitrate is higher.
Example Text Source:
#EXTINF:-1 channel-id="BallySouth" tvg-id="289" tvg-chno="289" tvg-logo="https://tmsimg.fancybits.co/assets/s12410_ll_h15_ab.png?w=360&h=270" tvc-guide-stationid="11130" tvg-name="BSSONC1" group-title="HD",BALLY SOUTH
https://xxx.channelsdvr.net:8089/devices/ANY/channels/48/hls/master.m3u8?codec=copy&session=xxx