On 25/09/2025 08:14, Bo Berglund via ffmpeg-user wrote:
On Wed, 24 Sep 2025 20:15:06 +0200, Timo Rothenpieler via ffmpeg-user
<ffmpeg-user@ffmpeg.org> wrote:
On 24.09.2025 09:54, Bo Berglund via ffmpeg-user wrote:
On Wed, 11 Jun 2025 20:54:06 +0200, Bo Berglund
<bo.berglund-at-gmail....@ffmpeg.org> wrote:
The hybrid_fragmented flag is used to enable viewers to read an mp4 file while
it is being wrtitten according to the documentation here:
https://ffmpeg.org/ffmpeg-formats.html
But has it been released yet and in that case from which version is it
available?
I really need to be able to start viewing mp4 files before they are closed by
the writer....
So now 3+ months later and noone seems to know about this?
Will this flag ever be available to the public using Linux?
Or is it available, but only if one uses some special installation of ffmpeg (I
am using the standard apt delivered ffmpeg on Ubuntu Server 24.04.3 LTS)
TIA
https://github.com/FFmpeg/FFmpeg/commit/6ec22731ae7694d4db08fff556eea58aa3b990d3
So that is a *description* of why you need it (in my case I want to read an
unfinished mp4 while it is being downloaded).
Now I have grabbed the very latest ffmpeg nightly from github and symlinked it
to be the on-path ffmpeg on one of my Linux machines and it does work for my
ordinary scripts to get the mp4 downloads working.
So I am on the bleeding edge of ffmpeg on that device.
But I have totally failed in using it with movflags, probably due to the lack of
instructions on *how* to activate that flag...
So please give me an example command for ffmpeg download where it is used
successfully to allow reading while writing the mp4 file.
I use this ffmpeg command in my download script today where I am forced to save
into a ts file because of the inability to read it if it is set to mp4 and I
want to modify it to use the new flag to allow me to download into an mp4:
CMD="ffmpeg -hide_banner -loglevel warning ${MODE} -i \"${M3U8URL}\" -r 30 -vf
scale=w=-4:h=480 -c:v libx264 -preset fast -crf 26 -x264-params
keyint=30:scenecut=0:open-gop=0 -c:a aac -t ${CAPTURETIME} -f mpegts
${TARGETFILETS}"
The variables are:
MODE = "-referer \"${VIDEOURL}\""
VIDEOURL = https URL of the webpage hosting the player
M3U8URL = the m3u8 of the video stream
CAPTURETIME = download time in seconds
TARGETFILETS = the ts video file name which I want to be an mp4 instead
I have tried adding this command before the -i argument:
movflags=+hybrid_fragmented
But it does not work, throws an error.
Apparently I do not know how to apply the movflags argument.....
Please help!
It's an argument to the output, which actually muxes the mp4 file, not
the input. So it goes before the respective output file.
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