possible bug in `qtdemx` element

[David Ing]

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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>>
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