Track switching and segments dowload scheduling

[bbert]

Hi,
I have a concern regarding segments download scheduling when switching (audio) track.
When switching tracks, the segments of the new track are not downloaded in the expected order.
To ease understanding, please fin below a figure illustrating the problem:

As you notice segment S6 will be downloaded before segments S3 of new track.
One consequence could to be to start to play S3 of previous track before downloading S3 of new track (in case of low bandwidth).

One solution to avoid this behavior would consist in removing buffer part after S1, once S1 of new track is appended. But maybe there is a valid reason for keeping buffer parts that should be overwritten?

[dsparacio]

Do you mind if I add this to the agenda for next week’s face to face? From: Bertrand Berthelot <[email protected]> Reply-To: "Dash-Industry-Forum/dash.js" <[email protected]> Date: Thursday, May 11, 2017 at 2:41 AM To: "Dash-Industry-Forum/dash.js" <[email protected]> Cc: Subscribed <[email protected]> Subject: [Dash-Industry-Forum/dash.js] Track switching and segments dowload scheduling (#1926) Hi, I have a concern regarding segments download scheduling when switching (audio) track. When switching tracks, the segments of the new track are not downloaded in the expected order. To ease understanding, please fin below a figure illustrating the problem: [ash js-audio-track-switch]<https://urldefense.proofpoint.com/v2/url?u=https-3A__cloud.githubusercontent.com_assets_5312520_25942933_732f8e8a-2D363e-2D11e7-2D81f1-2D4957bb7d454d.jpg&d=DwMCaQ&c=96ZbZZcaMF4w0F4jpN6LZg&r=HMIPFyLErj4M8VUwg3x36W02236DJoh_A_hxovpfrCc&m=AkoKXI4lZ3fxGj_2LZIBNisr8Ue7LERMmtCZrCxTi3A&s=mtko1L9kGhJ-PtqBvF8mQjWe8pW0OfWS_XOuDOdFI8U&e=> As you notice segment S6 will be downloaded before segments S3 of new track. One consequence could to be to start to play S3 of previous track before downloading S3 of new track (in case of low bandwidth). One solution to avoid this behavior would consist in removing buffer part after S1, once S1 of new track is appended. But maybe there is a valid reason for keeping buffer parts that should be overwritten? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub<https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_Dash-2DIndustry-2DForum_dash.js_issues_1926&d=DwMCaQ&c=96ZbZZcaMF4w0F4jpN6LZg&r=HMIPFyLErj4M8VUwg3x36W02236DJoh_A_hxovpfrCc&m=AkoKXI4lZ3fxGj_2LZIBNisr8Ue7LERMmtCZrCxTi3A&s=1eHf4K5xHW9zOlCP21gHfcKMAL4FgzPOlHsFhwC39xE&e=>, or mute the thread<https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_notifications_unsubscribe-2Dauth_AHgAjq3Ar5RcJV-5FBjj6stWgw0V8ivszXks5r4tfigaJpZM4NXwOc&d=DwMCaQ&c=96ZbZZcaMF4w0F4jpN6LZg&r=HMIPFyLErj4M8VUwg3x36W02236DJoh_A_hxovpfrCc&m=AkoKXI4lZ3fxGj_2LZIBNisr8Ue7LERMmtCZrCxTi3A&s=3Nk6IiKRHUEaI6Tvo14RQE6SE2pgPJunhO5PqkS5IbI&e=>.

[bbert]

Hi,
Yes, let's add this item to the agenda.
And why not in the more general sense, the question of segments searching (DashHandler) and scheduling.

[epiclabsDASH]

@bbert, closing this issue. With the new track switching mechanism we put in place (#2411) I think this issue doesn't make sense anymore.