[Bug 759338] New: pnmdec stalls when queue with min-threshold-buffers>1 is used

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759338

            Bug ID: 759338
           Summary: pnmdec stalls when queue with min-threshold-buffers>1
                    is used
    Classification: Platform
           Product: GStreamer
           Version: 1.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: msb at qtec.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

A pipeline using multifilesrc + pnmdec + queue with min-threshold-buffers>1
stalls after/during reading the second file.

This pipeline (using pngdec) runs fine:

gst-launch-1.0 --gst-debug=*:3,multifilesrc:5,pnmdec:5 multifilesrc index=0
name=filesrc location=\"/tmp/frame%04d.png\" caps=\"image/png, framerate=10/1\"
! pngdec ! queue min-threshold-buffers=2 ! fakesink async=0 sync=1

if however we swapt to PNM files (pnmdec) it stalls after reading the first
image:

gst-launch-1.0 --gst-debug=*:3,multifilesrc:5,pnmdec:5 multifilesrc index=0
name=filesrc location=\"frame%04d.ppm\" caps=\"image/x-portable-graymap,
framerate=10/1\" ! pnmdec ! queue min-threshold-buffers=2 ! fakesink async=0
sync=1

...
0:00:00.029443520  6172       0x6d3140 DEBUG           multifilesrc
gstmultifilesrc.c:388:gst_multi_file_src_get_filename: 0
0:00:00.029504276  6172       0x6d3140 DEBUG           multifilesrc
gstmultifilesrc.c:421:gst_multi_file_src_create:<filesrc> reading from file
"frame0000.ppm".
0:00:00.030860164  6172       0x6d3140 DEBUG           multifilesrc
gstmultifilesrc.c:463:gst_multi_file_src_create:<filesrc> read file
"frame0000.ppm".
0:00:00.031033479  6172       0x6d3140 WARN            videodecoder
gstvideodecoder.c:2479:gst_video_decoder_chain:<pnmdec0> Received buffer
without a new-segment. Assuming timestamps start from 0.
0:00:00.033083984  6172       0x6d3140 DEBUG           multifilesrc
gstmultifilesrc.c:388:gst_multi_file_src_get_filename: 1
0:00:00.033214362  6172       0x6d3140 DEBUG           multifilesrc
gstmultifilesrc.c:421:gst_multi_file_src_create:<filesrc> reading from file
"frame0001.ppm".
0:00:00.034374941  6172       0x6d3140 DEBUG           multifilesrc
gstmultifilesrc.c:463:gst_multi_file_src_create:<filesrc> read file
"frame0001.ppm".


if we set min-threshold-buffers to 1 it runs fine:

gst-launch-1.0 --gst-debug=*:3,multifilesrc:5,pnmdec:5 multifilesrc index=0
name=filesrc location=\"frame%04d.ppm\" caps=\"image/x-portable-graymap,
framerate=10/1\" ! pnmdec ! queue min-threshold-buffers=1 ! fakesink async=0
sync=1

I imagine the problem is in pnmdec since it runs fine with pngdec.

I get no errors or any hints of the problem with the debug levels used...

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