[gst-devel] 3gp demux plugin working on PC but not on target

[Rahul Verma]

Hi,

>ffmpeg_demux should not be used as a reference plugin for anything.
>It's not a good example to use at all. Don't use it for any
>comparisons; the ffmpeg demuxers are known to work poorly (and in many
>cases not work at all).

>I don't actually know what it does internally - I haven't looked -
>but a gstreamer demuxer plugin can't act on a file directly, because
>it doesn't even know if there IS a file involved at all.

>By "it must pull data" I mean that to get data from the upstream
>element (in pull mode), you must use gst_pad_pull_range().

Thanks Mike, this helped a lot. I was referring to ffmpeg_demux all this while and was going on the wrong track. As you said, I used gst_pad_pull_range() and it works wonderfully well. Now I don't have any dependency on the file source file handle.

One additional thing I needed to clarify. I tried using the same buffer returned by gst_pad_pull_range() in the function gst_pad_push() and got a crash. I tried functions like gst_buffer_make_writeable(), but even that did not help much. For the time being I am doing a memcpy and pushing the data, which I think is not a clean way. It is also causing audio breaks. Is there a way I can bypass this memcpy??

>I don't know either. Sorry, I can only give general suggestions, since
>you're not writing an open source plugin. Looking at the debug output
>(GST_DEBUG) might help you.

This AV sync is the last major issue I am facing. For a few streams, AV sync works fine, but for one particular stream I am having a pretty hard time. Anyways, I will keep my experiments going and try to keep you informed too. GST_DEBUG is also of not much help because GST_DEBUG:3 and above causes crash at random places when I run the code on target.

Regards,
Rahul Verma
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