[gst-devel] ffmpeg muxers - index not written in the result file

[Mark Nauwelaerts]

It is something else; a problem in your approach.
There is a difference between an EOS event (an event that travels downstream in 
the pipeline) and and EOS message (that is posted on the pipeline's bus).
The latter is typically posted as a *result* of all sinks in the pipeline having 
received an EOS event).
However, simply posting an EOS message will not make sinks (or upstream elements 
such as muxer) magically receive some EOS event.  Sending an EOS event (instead 
of having basesrc do it after N buffers) could alternatively be achieved by 
sending an EOS event downstream from a buffer probe callback, or pad block 
callback, or etc (likely with some caution), or by some other (than basesrc) 
element in the pipeline (e.g. entrans' dam).

Mark.

Julien Isorce wrote:
> Hi
> 
> I join to this mail a simple test.
> 
> The test demonstrates that when the pipeline is stopped when sending eos 
> from the client code, then ffmux_asf does not write the index, so it's 
> not possible to seek when playing back the result file.
> If I set num_buffers=N instead of sending eos, then the muxer write the 
> index.
> 
> Yes it should be the same result because when GstBaseSrc reachs 
> num_buffers_left = 0 then it return GST_FLOW_UNEXPECTED then an EOS is 
> generated.
> 
> So something is not flushed when ffmux receive eos in the first way.
> 
> Is it a bug from gstffmpegmux or a problem in ffmpeg-asfmux-libavcodec ? 
> or something else ?
> 
> ( ./test 0 rec.asf   -> index not written)  (eos sent from a 
> g_timeout_add callback)
> ( ./test 1 rec.asf   -> asf correclty generated)  (use num_buffers=N)
> 
> Sincerely
> 
> Julien
> 
> 
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