[FFmpeg-cvslog] Fix double write of DASH manifest in streaming mode

ffmpeg | branch: master | Kevin LaFlamme | Thu Jun 24 08:58:07 2021 -0400| [3f5d5c1c2dd71d1b4e5fcc0496337d1b224b0794] | committer: Karthick J Fix double write of DASH manifest in streaming mode When streaming mode is enabled, the DASH manifest is written on the first packet for the segment so

[FFmpeg-cvslog] dashenc: Write out DASH manifest immediately in streaming mode

ffmpeg | branch: master | Kevin LaFlamme | Tue Jun 8 15:03:43 2021 -0400| [7d1464721ebf5c90308e48cb81ad52dbada47c18] | committer: Karthick J dashenc: Write out DASH manifest immediately in streaming mode When streaming mode is enabled with fMP4/CMAF for DASH output, the segment files