[gst-devel] During playback (http progressive downloaded), is it possible to save media content to disk correctly ?

[Zhao, Halley]

Based on some finding in previous thread, 
I doubt the possibility to save file on disk during playback of progressive downloaded.

For the mp4 file mentioned below, some bytes differ from original file at the beginning of test.mp4, and test.mp4 also loses hundreds of bytes at the end of file.

Since there are many cases that parsers don't read file in serial order, saved file from souphttpsrc in gst pipeline often differ from original file.


-----Original Message-----
From: Zhao, Halley [mailto:halley.zhao at intel.com] 
Sent: 2010年9月8日 10:21
To: Discussion of the development of GStreamer
Subject: Re: [gst-devel] some issues when trying to save content to disk during http progressive downloaded

Thanks.

I understand that there are possible headers at the START or the END, however my question is about the saved contents, not playback itself during progressive downloaded.

If I don't add a tee and filesink to save the content, all my mentioned contents can playback in progressive downloaded well.

Especially for the mp4 contents mentioned, files are different (even file size) between save during playback and save directly from souphttpsrc:
gst-launch-0.10 souphttpsrc location=http:// 10.238.37.11/share/media/video/test.mp4 ! tee name=t ! decodebin ! ffmpegcolorspace ! xvimagesink t. ! queue ! filesink location=test.mp4

gst-launch-0.10 souphttpsrc location=http:// 10.238.37.11/share/media/video/test.mp4 ! filesink location=/home/halley/swap/streaming/test2.mp4

I suspect soup request header at the END of the mp4 file when playback starts, but this header isn't save to file by filesink.



-----Original Message-----
From: Michael Smith [mailto:msmith at xiph.org] 
Sent: 2010年9月8日 10:02
To: Discussion of the development of GStreamer
Subject: Re: [gst-devel] some issues when trying to save content to disk during http progressive downloaded

On Tue, Sep 7, 2010 at 6:45 PM, Zhao, Halley <halley.zhao at intel.com> wrote:
> During playback of progressive content, I tried to save the content to disk
> as well.
>
> But the result is strange:
>
> Some contents are saved correctly, some contents are saved but can’t
> playback again; some contents even can’t playback during progressive
> downloaded.

What you describe sounds like what's expected.

True streaming formats (like ogg) work fine.

Formats that may have the headers at the start OR the end vary - some
have the headers at the end, so they're not playable until you've
downloaded the entire file. Some have them at the start, so
progressive download/playback works.

This doesn't have anything to do specifically with GStreamer, it's
simply how the formats work.

Mike

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