On 2/10/2023 3:20 AM, Bouke / Videotoolshed wrote:
Faststart is for internet / network playing only, when the entire file is not
yet available.
Not only for network playback; maybe often used for that but there's no
reason to limit the use.
If movflags faststart is needed, it should be darn fast as your files
’should’ be fairly small, as they are intended for (relative) low
bandwith. > There is NO penalty for having the MOOV atom at the end if a file is
local, as parsing all atoms will not take longer than a few secs if the
file is local.
It's difficult to characterize a 2 hour FHD (or 4k) video file as small or
intended for low bandwidth, and there -is- a penalty ("a few seconds"). Many
playout servers will play from MP4 files and "a few seconds" is a few too
long when a specific file is to play. Some software will pre-open the file
and start it on time, but that's no reason to not put the necessary info at
the head of the file. (The OP also says "As the produced files are very big
anyway I don't mind wasting a few MB by overestimating.")
It would be interesting to see how accurate Bouke's technique is for
estimating the moov atom size; probably close enough but confirmation is
always good.
Later,
z!
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