On 2024-09-30 01:29 am, Bo Berglund wrote:
I have created a script that downloads Internet video streams (basically news
programs) and transcodes to mp4 format with a fixed windows size.
As soon as the video stream recording ends the mp4 file can be played.
I wonder if there is a way to let ffmpeg do two things at the same time:
- download as now but save the stream to a TS formatted file and:
- transcode to the mp4 format into a different output file
This would make it possible to start viewing the downloaded file in TS format
while the real output file remains unplayable until the download finishes and
the moov atom gets written.
Three months ago, ffmpeg's mov/mp4 muxer added a movflags called
`hybrid_fragmented`
From the doc description,
"
For recoverability - write the output file as a fragmented file. This
allows the intermediate file to be read while being written (in
particular, if the writing process is aborted uncleanly). When writing
is finished, the file is converted to a regular, non-fragmented file,
which is more compatible and allows easier and quicker seeking.
If writing is aborted, the intermediate file can manually be remuxed to
get a regular, non-fragmented file of what had been written into the
unfinished file.
"
Regards,
Gyan
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