callback "New-sample"

[Matthew Waters]

qtmux faststart=true will cause that to happen as it needs to write the 
qt moov/etc header before any of the actual media data.  That's how 
faststart is defined.

qtmux into appsink is an unseekable resource (unless you've overriden 
the seeking query) which would only work with some modes of qtmux.

If you are running GStreamer git master, then qtmux will write the 
regular mode with a moov at the end after many mdat blocks when provided 
with an unseekable downstream.

Cheers
-Matt

On 14/9/21 4:02 pm, Armin Erkert via gstreamer-devel wrote:
>
>
> Hello Michael,
>
> I have already set the "emit-signal" to true
>
> g_object_set (app->sink, "emit-signals", TRUE, NULL);
> g_signal_connect (app->sink, "new-sample", G_CALLBACK (new_sample), app);
>
> but the callback "new-sample" is retrieved several 100th times only 
> after I have pushed all images into the stream.
>
> Have now seen that in the \tmp\ a temporary file qtmuxXXXXX is 
> created, and suspect that qtmux first caches everything ....
>
> Regards
> Armin
>
>
> Translated with www.DeepL.com/Translator (free version)
>
> Zitat von Michael Gruner via gstreamer-devel 
> <gstreamer-devel at lists.freedesktop.org>:
>
>> Hello Armin
>>
>> You need to set the “emit-signals” property in the appsink to TRUE.
>>
>> Michael
>> www.ridgerun.com
>>
>>> On 13 Sep 2021, at 14:19, Armin Erkert via gstreamer-devel 
>>> <gstreamer-devel at lists.freedesktop.org> wrote:
>>>
>>> 
>>> Hello,
>>>
>>> have problems with the following pipe
>>> "appsrc is-live=true name=source 
>>> caps=video/x-raw,width=2464,height=512,format=GRAY8,framerate=10/1 ! 
>>> nvvidconv ! video/x-raw(memory:NVMM),format=I420 ! nvv4l2h265enc 
>>> iframeinterval=20 ! h265parse ! qtmux faststart=true ! appsink 
>>> name=sink"
>>>
>>> which I use in my C++ program, and namely the callback "New-sample" 
>>> from the appsink, is only called after an EOS in the appsrc
>>> (g_signal_emit_by_name (app->source, "end-of-stream", &ret).
>>>
>>> How can I improve this ?
>>>
>>>
>>> Regarda
>>>
>>> --------------------------------
>>> Ing. Erkert Armin
>>> Mittelstrich 9
>>> I-39050 Tiers (BZ)
>>>
>>> Email: armin.erkert at rolmail.net
>>> Tel.:  +39 349 4385335
>>> WWW:   www.erkert.it
>>>
>
>
>
> --------------------------------
> Ing. Erkert Armin
> Mittelstrich 9
> I-39050 Tiers (BZ)
>
> Email: armin.erkert at rolmail.net
> Tel.:  +39 349 4385335
> WWW:   www.erkert.it
>


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