Gstreamer test run hangs at certain point in debug output

[Martin Maurer]

Hi,

I execute the following commands on Windows and Linux:

> set 
GST_DEBUG=*:1,GST_META*:9,GST_EVENT*:9,GST_DATAFLOW:9,videoencoder:9,bufferpool:9,videopool:9,basesink:9,fakesink:9,GST_BUFFER:9,qsH264enc:9,GST_TRACER*:7

> set GST_TRACERS=leaks

> gst-launch-1.0.exe videotestsrc  num-buffers=100 ! 
video/x-raw,format=I420,width=1920,height=1080,framerate=60/1 ! 
openh264enc ! h264parse ! mp4mux ! filesink location="abc.mov"

This test run hangs on Windows with version 1.12, but it works on Linux 
with version 1.11.1.

But I think I also have seen it in earlier version of Windows (perhaps 
already in beginning of 1.10?).

On Windows it looks like (last relevant lines):

…

0:00:01.129951470  4544 0000000002BCC280 LOG               GST_BUFFER 
gstbuffer.c:1721:gst_buffer_map_range: buffer 0000000002C49920, idx 0, 
length -1, flags 0002

0:00:01.135682601  4544 0000000002BCC280 LOG               GST_BUFFER 
gstbuffer.c:213:_get_merged_memory: buffer 0000000002C49920, idx 0, length 1

0:00:01.140517742  4544 0000000002BCC280 LOG               GST_BUFFER 
gstbuffer.c:1876:gst_buffer_extract: buffer 0000000002C491B0, offset 0, 
size 16

0:00:01.145276302  4544 0000000002BCC280 LOG               GST_BUFFER 
gstbuffer.c:1876:gst_buffer_extract: buffer 0000000002C495F0, offset 0, 
size 4

0:00:01.151505571  4544 0000000002BCC280 ERROR                default 
gstevent.c:818:gst_event_new_caps:handling interrupt.

Interrupt: Stopping pipeline ...

ERROR: pipeline doesn't want to preroll.

Setting pipeline to NULL ...

^CBatchvorgang abbrechen (J/N)? j

“handling interrupt” occurs when I press Ctrl-C to abort the test run.

(I think when I enable more debug data or reach a certain point of 
num-buffers, I am even not more able to stop gst-launch anymore, I must 
kill it via task manager.)

Added some general debug output in gstevent.c line 818 where debug 
output shall be printed.

*caps point to address 0x0000000002BD36A0

I dumped first 4 bytes on this address: F0 F2 48 00

On Linux I see (filtered to file gstevent.c and line 808):

# grep gst_event_new_caps abc.log

0:00:00.320152667   282  0x1577e00 INFO               GST_EVENT 
gstevent.c:808:gst_event_new_caps: creating caps event video/x-raw, 
format=(string)I420, width=(int)1920, height=(int)1080, 
framerate=(fraction)60/1, pixel-aspect-ratio=(fraction)1/1, 
interlace-mode=(string)progressive

0:00:00.322927333   282  0x1577e00 INFO               GST_EVENT 
gstevent.c:808:gst_event_new_caps: creating caps event video/x-raw, 
format=(string)I420, width=(int)1920, height=(int)1080, 
framerate=(fraction)60/1, pixel-aspect-ratio=(fraction)1/1, 
interlace-mode=(string)progressive

0:00:00.369638667   282  0x1577e00 INFO               GST_EVENT 
gstevent.c:808:gst_event_new_caps: creating caps event video/x-h264, 
stream-format=(string)byte-stream, alignment=(string)au, 
profile=(string)baseline, width=(int)1920, height=(int)1080, 
pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)60/1, 
interlace-mode=(string)progressive, colorimetry=(string)bt709, 
chroma-site=(string)mpeg2

0:00:00.702754000   282  0x1577e00 INFO               GST_EVENT 
gstevent.c:808:gst_event_new_caps: creating caps event video/x-h264, 
stream-format=(string)avc, alignment=(string)au, 
profile=(string)constrained-baseline, width=(int)1920, height=(int)1080, 
pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)60/1, 
interlace-mode=(string)progressive, colorimetry=(string)bt709, 
chroma-site=(string)mpeg2, parsed=(boolean)true, level=(string)4.2, 
codec_data=(buffer)0142c02affe100106742c02a8c8d403c0112f2c03c2211a801000468ce3c80

0:00:00.707792000   282  0x1577e00 INFO               GST_EVENT 
gstevent.c:808:gst_event_new_caps: creating caps event video/quicktime, 
variant=(string)iso

0:00:18.299080335   282  0x1577e00 INFO               GST_EVENT 
gstevent.c:808:gst_event_new_caps: creating caps event video/quicktime, 
variant=(string)iso, streamheader=(buffer)< 
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 
 >

#

#

Perhaps something is getting too long (for Windows)? Perhaps some 
intermediate buffer with only 256 bytes?

Or some decoding is not working?

Counting lines of this special output, it seems it has problems in line 
with 
“codec_data=(buffer)0142c02affe100106742c02a8c8d403c0112f2c03c2211a801000468ce3c80”,

but could also be an argument before of this.

Where do I find the conversion from *caps to a readable string? Is it 
distributed over multiple files or each module decodes its own data?

Best regards,

Martin