[FFmpeg-devel] [PATCH] avformat/hlsenc: added segment file deletion

[Christian Suloway]

On 12/9/14, 7:44 PM, "Michael Niedermayer" <michaelni at gmx.at> wrote:

>On Mon, Dec 08, 2014 at 10:25:05AM -0600, Christian Suloway wrote:
>> This option flag deletes segment files removed from the playlist after a
>> period of time equal to the duration of the segment plus the duration of
>> the playlist.
>
>can you explain the usecase for this ?
>isnt -hls_wrap <num> already achieving this more or less ?

-hls_wrap <num> does achieve this more or less, but the option has been
proposed for two reasons:

(1) Simplify compliance with HLS Internet-Draft
(http://tools.ietf.org/html/draft-pantos-http-live-streaming) section
6.2.2., Live Playlists:

   When the server removes a Media Segment URI from the Playlist, the
   corresponding Media Segment MUST remain available to clients for a
   period of time equal to the duration of the segment plus the duration
   of the longest Playlist file distributed by the server containing
   that segment.  Removing a Media Segment earlier than that can
   interrupt in-progress playback.

The playlist length/duration can change without computation and
modification to the -hls_wrap <num> argument.

(2) Although not required in the HLS Internet-Draft, it can be useful to
have the sequence number in the segment URI for tracking when logging and
making modifications to playlists.

Thank you for your consideration.