我想先用Ffmpeg将视频流从HLS拉推到 RTMP.at 很正常，但是当我打开更多时，它运行正常，但没有视频数据拉取和推送
环境：Windows64+Nginx-rtmp-static+Ffmpeg-static+Java1.8
这是没有用的，即使我重新启动rtmp服务器。
ffmpeg -i xxx/live.m3u8 -vcodec h264-s 720*480 -an -f flv -y rtmp://xxx
前几个视频流是正常的，但是当我打开更多流（5+）时，它运行正常，但没有数据拉取。
2019-01-08 10:58:15.658 INFO ->frame=0 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A dup=0 drop=720 speed= 0x
2019-01-08 10:58:16.598 INFO ->[http @ 0000015efc568280] Opening 'xxx/1/live.m3u8' for reading
2019-01-08 10:58:16.984 INFO ->[http @ 0000015efb1200c0] Opening 'xxx/1/seghik30.ts' for reading
2019-01-08 10:58:17.083 INFO ->frame= 0 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A dup=0 drop=744 speed= 0x
2019-01-08 10:58:18.033 INFO ->[http @ 0000015efc568280] Opening 'xxx/1/live.m3u8' for reading
2019-01-08 10:58:18.146 INFO ->[http @ 0000015efb1200c0] Opening 'xxx/1/seghik31.ts' for reading
2019-01-08 10:58:18.267 INFO ->frame= 0 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A dup=0 drop=770 speed= 0x
2019-01-08 10:58:19.220 INFO ->[http @ 0000015efc568280] Opening 'xxx/1/live.m3u8' for reading
2019-01-08 10:58:19.317 INFO ->[http @ 0000015efb1200c0] Opening 'xxx/1/seghik32.ts' for reading
2019-01-08 10:58:19.415 INFO ->[http @ 0000015efb138600] Opening 'xxx/1/seghik33.ts' for reading
2019-01-08 10:58:19.494 INFO ->frame= 0 fps=0.0 q=0.0 size= 0kB time=00:00:00.00 bitrate=N/A dup=0 drop=795 speed= 0x
2019-01-08 10:58:20.375 INFO ->[http @ 0000015efc568280] Opening 'xxx/1/live.m3u8' for reading
2019-01-08 10:58:20.486 INFO ->[http @ 0000015efb138600] Opening 'xxx/1/seghik34.ts' for reading
今天，我尝试重写命令"vcodec copy"，它运行正常，但同时"-s"无效