用ffmpeg转换格式之后，fps变了，从4编程4.22
疑惑，一直没找到怎么设定回来

转换命令是
ffmpeg -f concat -i all.ts -vcodec copy -acodec copy all.mp4


原视频信息
Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuvj420p(pc, bt709, progressive), 1280x720, 4 fps, 25 tbr, 90k tbn, 8 tbc
转换后信息
Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc, bt709), 1280x720, 210 kb/s, 4.22 fps, 25 tbr, 90k tbn, 8 tbc (default)
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FROM 120.244.218.*