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Bug 796002 - hlssink/hlssink2: support append-list option
hlssink/hlssink2: support append-list option
Product: GStreamer
Classification: Platform
Component: gst-plugins-bad
git master
Other Linux
: Normal enhancement
: git master
Assigned To: GStreamer Maintainers
GStreamer Maintainers
Depends on:
Reported: 2018-05-10 12:39 UTC by Daeseok Youn
Modified: 2018-11-03 14:22 UTC
See Also:
GNOME target: ---
GNOME version: ---

hlssink: support append-list option (5.06 KB, patch)
2018-05-10 12:43 UTC, Daeseok Youn
none Details | Review
hlssink2: support append-list option (5.49 KB, patch)
2018-05-10 12:43 UTC, Daeseok Youn
none Details | Review
hlssink: support append-list option (5.04 KB, patch)
2018-05-15 09:27 UTC, Daeseok Youn
none Details | Review
hlssink2: support append-list option (5.44 KB, patch)
2018-05-15 09:28 UTC, Daeseok Youn
none Details | Review

Description Daeseok Youn 2018-05-10 12:39:32 UTC
The "append-list" option is able to append segment files after parsing previous playlist file. The sequence number will start from previous sequence number + 1.
Comment 1 Daeseok Youn 2018-05-10 12:43:16 UTC
Created attachment 371891 [details] [review]
hlssink: support append-list option

Appends the new segments into old hls segment list
Comment 2 Daeseok Youn 2018-05-10 12:43:44 UTC
Created attachment 371893 [details] [review]
hlssink2: support append-list option
Comment 3 Tim-Philipp Müller 2018-05-10 14:52:21 UTC
It would be nice if you could expand on why this is needed and/or in what context it would be useful :)
Comment 4 Daeseok Youn 2018-05-11 06:41:02 UTC
The "append-list" option could be used to live stream. For example, something happened in encoder and the encoder is restarted but continue the segment files from previous m3u8.

And also the append-list option is one of hls flags in Ffmpeg.
The patch link below is related to "append-list" on ffmpeg.
Comment 5 Sebastian Dröge (slomo) 2018-05-11 07:22:42 UTC
This seems useful, but apart from just reading the latest seqnum you also should parse the different fragments so that hlssink can remove old fragments as configured.
Comment 6 Daeseok Youn 2018-05-11 08:49:49 UTC
You mean,

if previous m3u8 file has below contents:


Run Gstreamer with "append-list=true", it appends segnum started from 1 instead of 4.
(currently, the seqnum starts from 4 in this example)

Am I right?
Comment 7 Sebastian Dröge (slomo) 2018-05-11 08:54:40 UTC
See the max-files and playlist-length properties on hlssink/hlssink2. By default, at most 5 files are kept in the playlist and 10 files on disk.
Comment 8 Sebastian Dröge (slomo) 2018-05-11 08:55:14 UTC
Also yes, the seqnums should stay continuous after starting again with append-list=true
Comment 9 Daeseok Youn 2018-05-11 09:38:37 UTC
ok. I will put patches again after fixing it as your comment.
Comment 10 Daeseok Youn 2018-05-15 09:27:16 UTC
Created attachment 372046 [details] [review]
hlssink: support append-list option

v2: start segnum from (previous start segnum + 1)
Comment 11 Daeseok Youn 2018-05-15 09:28:09 UTC
Created attachment 372047 [details] [review]
hlssink2: support append-list option

v2: same reason with hlssink
Comment 12 Daeseok Youn 2018-05-15 09:37:36 UTC
Hi Sebastian,

I tried to fix this path up to adjust sequence number as previous start number + 1.

But as I know, if playlist-length is smaller value than max-files, m3u8 couldn't have all of segment files what are kept on disk. It means, when append-list option is used, hlssink could not parse the number of files on disk from playlist.m3u8, right?

Actually, I ran ffmpeg following options:
$ ffmpeg -i ~/Videos/sample.mp4 -codec copy -strict -2 -hls_time 10 -hls_flags append_list+delete_segments -f hls ./playlist.m3u8

I think "append_list+delete_segments" option could not manage previous generated segment files.

Please check updated patches and provide your comment for this.
Comment 13 GStreamer system administrator 2018-11-03 14:22:46 UTC
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