possible bug in `qtdemx` element

[David Ing]

The segmentation fault (ges-launch-1.0) did not occur for the 1.16.0-msvc
build, just 1.16.0-mingw.  So there is apparently something wrong with the
mingw build.

So the problem has now been documented in all these Windows builds.

   - 1.16.0 msvc   -- NO PROBLEM
   - 1.16.0 mingw -- PROBLEM
   - 1.14.4 mingw -- PROBLEM
   - master on fedora 30 -- NO PROBLEM

In checking fedora 30, I was using docker which means I used a slightly
different `gst-launch` command because playsink would not work.

gst-launch-1.0 filesrc location=/screencap.mp4 ! decodebin ! queue !
theoraenc ! oggmux ! filesink location=whatever.mp4


So I guess we are dealing with a problem related to the mingw build.


On Wed, Jun 19, 2019 at 12:19 PM David Ing <ding at panopto.com> wrote:

> I can't provide a stack trace because there are no debug symbols provided
> with `1.16.0-mingw`.
>
> On Wed, Jun 19, 2019 at 12:15 PM Thibault Saunier <tsaunier at gnome.org>
> wrote:
>
>> master on fedora30.
>>
>> You should provide a stack trace if you get a segfault.
>>
>> On Wed, Jun 19, 2019 at 2:52 PM David Ing <ding at panopto.com> wrote:
>>
>>> Thibault -- Which OS are you using?  Which version of Gstreamer?
>>>
>>> This is what happens on Windows 10 with gstreamer 1.16.0-mingw:
>>>
>>> $ ges-launch-1.0 +clip screencap.mp4
>>> <position: 0:00:00.066733333 duration: 0:04:13.600000001 speed: 1.000000
>>> />
>>> Segmentation fault
>>>
>>> On Wed, Jun 19, 2019 at 11:40 AM Thibault Saunier <tsaunier at gnome.org>
>>> wrote:
>>>
>>>> `ges-launch-1.0 +clip ~/Downloads/screencap.mp4` works just fine here.
>>>>
>>>> - Thibault
>>>>
>>>> On Wed, Jun 19, 2019 at 2:18 PM David Ing <ding at panopto.com> wrote:
>>>>
>>>>> I have a video file (no audio) which plays nicely in
>>>>>
>>>>>    - VLC
>>>>>    - Windows Media Player on Windows 10
>>>>>    - Whatever application plays videos by default in Windows 10
>>>>>
>>>>> The video is here:
>>>>>
>>>>>
>>>>> https://drive.google.com/file/d/1EJj8Ydb5khkQAxCtbjZ0piZPk93Lwwz8/view?usp=sharing
>>>>>
>>>>> I have analyzed the video with `ffprobe` (in many ways) and I cannot
>>>>> find any problems with it.
>>>>>
>>>>> The problem is: *qtdemux* doesn't play nicely with the video; and so
>>>>> I cannot use GES with the video (which is my ultimate goal).
>>>>>
>>>>> The problem apparently exists in Gstreamer 1.14.4 and 1.16.0 (these
>>>>> are the two versions I tested).
>>>>>
>>>>> The problem is easily reproduced using `gst-launch` commands.
>>>>>
>>>>> # ------------------------
>>>>> # Gstreamer 1.14.4 (mingw windows)
>>>>> # ------------------------
>>>>> $ *gst-launch-1.0 filesrc location=screencap.mp4 ! decodebin !
>>>>> playsink*
>>>>> Setting pipeline to PAUSED ...
>>>>> Pipeline is PREROLLING ...
>>>>> Redistribute latency...
>>>>> Redistribute latency...
>>>>> ERROR: from element
>>>>> /GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstQTDemux:qtdemux0:
>>>>> Internal data stream error.
>>>>> Additional debug info:
>>>>> qtdemux.c(6073): gst_qtdemux_loop ():
>>>>> /GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstQTDemux:qtdemux0:
>>>>> streaming stopped, reason not-negotiated (-4)
>>>>> ERROR: pipeline doesn't want to preroll.
>>>>> Setting pipeline to NULL ...
>>>>> Freeing pipeline ...
>>>>>
>>>>> # ------------------------
>>>>> # Gstreamer 1.16.0 (mingw windows)
>>>>> # ------------------------
>>>>> $ *gst-launch-1.0 filesrc location=screencap.mp4 ! decodebin !
>>>>> playsink*
>>>>> Setting pipeline to PAUSED ...
>>>>> Pipeline is PREROLLING ...
>>>>> Redistribute latency...
>>>>> Redistribute latency...
>>>>> WARNING: no real random source present!
>>>>> ERROR: from element
>>>>> /GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstQTDemux:qtdemux0:
>>>>> Internal data stream error.
>>>>> Additional debug info:
>>>>> ../gst/isomp4/qtdemux.c(6607): gst_qtdemux_loop ():
>>>>> /GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstQTDemux:qtdemux0:
>>>>> streaming stopped, reason not-negotiated (-4)
>>>>> ERROR: pipeline doesn't want to preroll.
>>>>> Setting pipeline to NULL ...
>>>>> Freeing pipeline ...
>>>>> _______________________________________________
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>>>>> gstreamer-devel at lists.freedesktop.org
>>>>> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>>>
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