possible bug in `qtdemx` element

[David Ing]

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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>
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