HELP: ffmux_mov question

[Song, Yingsheng]

Thanks a lot.
Song

-----Original Message-----
From: gstreamer-devel-bounces+yisong=tycoint.com at lists.freedesktop.org [mailto:gstreamer-devel-bounces+yisong=tycoint.com at lists.freedesktop.org] On Behalf Of Mandeep Sandhu
Sent: 15 November 2012 04:51
To: Discussion of the development of and with GStreamer
Cc: lists at svrinformatica.it
Subject: Re: HELP: ffmux_mov question

> I saw the faststart property, but don't fully understand it. I'll appreciate if someone used it before and could give a bit more description on it.

I'm not an authority on this, but I'll give a short answer. We're using qtfaststart in one of our FFMPEG based transcoding product.

QT faststart basically moves the moov_atom [1] (I think this is the index info of the media stream) to the start of the media file and is helpful for streaming media (only?).

This helps the media client to play the stream immediately as it does not have to wait for the whole file to be downloaded to get the index information [2]. I think this was first used in progressive download based players where they wanted to start playback after receiving the initial portion of a media file.

CMIIW.

HTH,
-mandeep

[1] http://atomicparsley.sourceforge.net/mpeg-4files.html
[2] http://multimedia.cx/eggs/improving-qt-faststart/

>
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> Sorry for keep sending possible stupid questions.
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> Thanks again,
>
> Song
>
>
>
> From: gstreamer-devel-bounces+yisong=tycoint.com at lists.freedesktop.org
> [mailto:gstreamer-devel-bounces+yisong=tycoint.com at lists.freedesktop.o
> rg] On Behalf Of Mailing List SVR
> Sent: 13 November 2012 15:16
> To: gstreamer-devel at lists.freedesktop.org
> Subject: Re: HELP: ffmux_mov question
>
>
>
> Il 13/11/2012 15:37, Song, Yingsheng ha scritto:
>
> Hi,
>
>
>
> I am hoping to get some advice from you on the following task.
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> Basically we are trying to implement a pipeline reading (by a customer GStreamer element) raw frame data from disk, pass to ffmux_mov, which generates mp4, and passes to a fdsink.
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> If the fdsink is associated with a disk file, we get a mp4 file and everything is fine.
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> However, we were asked to associate the stdout to the fdsink so that the mp4 is not created under the disk, but directly get outputted to the stdout as an http response to the Client. This doesn't work. The main issue is that the ffmux_mov tries to send SEEK events to the fdsink to set write-pointers to different positions of the mp4 to handle headers, trailers etc. As the stdout is not a seekable resource, this wouldn't work.
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> I wonder has anyone tried this before.
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> Have I missed something?
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> Can ffmux_move be modified to work in the above scenario?
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> Is there other good ways to do the above, such as using other containers instead of mp4?
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> Any advice is highly appreciated.
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> try to use mp4mux and set streamable=true, should work,
>
> Nicola
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> Apologise if I send to the wrong place. I'm new to GStreamer and only registered to the mail-list yesterday.
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> Song
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