thanks for your kind help!
But please forgive me for my foolishness.
I have no idea about the part of -user-agent "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36" in the code. It seems to be connected with the browser ?
So I just copy your code directly and apply it to the ffmepg as the follows:
For the first time ,I used.<code>ffmpeg -user-agent "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36" -i "https://nbcmpx-vh.akamaihd.net/i/video/1000/467/170704_3545906_Today___Aug_08__2017_,25,40,18,12,7 ,4,2,00.mp4.csmil/master.m3u8?hdnea=st=1502268142~exp=1502280772~acl =/i/video/1000/467/170704_3545906_Today___Aug_08__2017_*~id=45ae9ff6-b9b2-49a7-b70f-af0727e1ae82~hmac=37091d2c6398c07e0a65bb6e60869ca4 c56487e18d315cb278935d6584b4033f" -c copy today_170808.mp4</code>
For the 2nd time , I used <code>ffmpeg -user-agent "Mozilla/5.0" -i "https://nbcmpx-vh.akamaihd.net/i/video/1000/467/170704_3545906_Today___Aug_08__2017_,25,40,18,12,7 ,4,2,00.mp4.csmil/master.m3u8?hdnea=st=1502268142~exp=1502280772~acl =/i/video/1000/467/170704_3545906_Today___Aug_08__2017_*~id=45ae9ff6-b9b2-49a7-b70f-af0727e1ae82~hmac=37091d2c6398c07e0a65bb6e60869ca4 c56487e18d315cb278935d6584b4033f" -c copy today_170808.mp4</code>
AND for the 3rd time, <code>ffmpeg -i "https://nbcmpx-vh.akamaihd.net/i/video/1000/467/170704_3545906_Today___Aug_08__2017_,25,40,18,12,7 ,4,2,00.mp4.csmil/master.m3u8?hdnea=st=1502268142~exp=1502280772~acl =/i/video/1000/467/170704_3545906_Today___Aug_08__2017_*~id=45ae9ff6-b9b2-49a7-b70f-af0727e1ae82~hmac=37091d2c6398c07e0a65bb6e60869ca4 c56487e18d315cb278935d6584b4033f" -c copy today_170808.mp4</code>
ALL the three attempts gave me the same result
ffmpeg3.jpg
Could you be patient enough to teach me more about this ?
thank you very much!!