possible bug in `qtdemx` element

[David Ing]

Since this is a mingw-only problem, I created a bug for cerbero.

https://gitlab.freedesktop.org/gstreamer/cerbero/issues/163

On Wed, Jun 19, 2019 at 2:00 PM David Ing <ding at panopto.com> wrote:

> 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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