streaming mpeg-dash

[Dimitrios Katsaros]

The logic for the rolling window has not been implemented. So unfortunately
those features will need to be implemented if you want to have something
like that. For the Firefox/Chrome issue, as you noticed, they require that
you define the type of codec to use. you need to add an additional field to
the mpd file. What I am using is in gstreprisentation.c I have added:

if (rep->common.stream_type == STREAM_TYPE_VIDEO) {
>     if (!gst_media_presentation_write_string_attribute (writer,
>             "codecs", "avc1.640028"))
>         return FALSE;
>     } else if (rep->common.stream_type == STREAM_TYPE_AUDIO) {
>         if (!gst_media_presentation_write_string_attribute (writer,
>                 "codecs", "mp4a.40.2"))
>             return FALSE;
> }
>

You may have to change the codecs based on what you are using.

Dimitrios

On Thu, May 18, 2017 at 10:50 PM, Alexander Yanin <sashayanin at gmail.com>
wrote:

> I have compiled mp4dashmux and dashsink from Thiago Sousa Santos git repos
> and tried a pipeline with them like this:
>
> gst-launch-1.0 videotestsrc is-live=true ! timeoverlay ! x264enc !
> mp4dashmux fragment-method=1 ! dashsink is-live=true delete-old-files=true
> title="manifest"
>
> This pipeline starts successfully, produces a manifest file and m4s
> fragments as expected. Then I have created a simple html with a video tag
> and linked dash js library to this html to play my dash stream. I have
> tried to open this html (served on http server) in Chrome, Firefox and
> Epiphany. Only Epiphany was able to play the stream. Firefox and Chrome
> gave similar error:
> Firefox says: Cannot play media. No decoders for requested formats:
> application/dash+xml, video/mp4;codecs="undefined"
> Chrome says: videoCodec (video/mp4;codecs="undefined") is not supported.
> I hope that the problem is with codecs="undefined" property produced by
> dashsink. I think that this issue can be easily fixed if this is a reason.
>
> However, I have another issue. My pipeline doesn't erase old files. Even
> if is set 'is-live' and 'delete-old-files' properties to true in dashsink,
> the number of fragments is constantly increasing. First file in playlist
> doesn't change from 'fragment_0' in my manifest file too. So, when I
> refresh my browser, I always have my stream played from the very beginning
> (it is easy to detect as i have timeoverlay plugin inserted into the
> pipeline). What am I doing wrong with this? Is deleting of old files works
> correctly in current version of dashsink?
>
> 2017-04-10 13:48 GMT+03:00 Alexander Yanin <sashayanin at gmail.com>:
>
>> Hi,
>>
>> I want to use gstreamer for streaming media over mpeg-dash. As I
>> understood, there is no available dashsink yet. In slomo's blog
>> <https://coaxion.net/blog/2014/05/http-adaptive-streaming-with-gstreamer/>
>> I have found a link <https://bugzilla.gnome.org/show_bug.cgi?id=668094>
>> to dashsink that is still in bugzilla. Can I use it for the streaming
>> purpose already? Is there any articles or docs with instructions of how
>> this sink could be used? How soon this plugin is expected to be merged to
>> gst-plugins-bad? Can someone show an example pipeline with dashsink
>> included? Any help on understanding how to work with this sink would be
>> highly appreciated.
>>
>> Best regards,
>> Alex
>>
>
>
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