Non zero segment-start for mp4 video

[Nicolas Dufresne]

Le jeu. 2 sept. 2021 16 h 45, Hayk Avetisyan via gstreamer-devel <
gstreamer-devel at lists.freedesktop.org> a écrit :

> Just one note. You can use this more simple pipeline:
> *gst-launch-1.0 uridecodebin
> uri=https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm
> <https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm>
> ! x264enc ! mp4mux ! filesink location=sintel_trailer.mp4*
>

With default configuration, x264enc will introduce a shift that would lead
to negative DTS. As DTS are unsigned in GStreamer, we workaround by
shifting forward the timestamp, and then offsetting back using the
GstSegment.

If this is your case, this isn't a bug and should not cause any issue, as
you will use running time in your muxer.


>
> On Thu, Sep 2, 2021 at 11:13 PM Hayk Avetisyan <hayka at deepcraft.io> wrote:
>
>> Hi experts,
>>
>> i create an mp4 video from webm source video. The segment's start at the
>> source webm video definitely is 0 but in mp4 file the segment-start is
>> 0.083s.
>> The pipeline is the following:
>>
>> *gst-launch-1.0 filesrc location=<path/sintel_trailer.webm> ! decodebin !
>> x264enc ! mp4mux ! filesink location= <path/sintel_trailer.mp4>*
>>
>>    1. Why is this happening?
>>    2. Is there any way to avoid non-zero segment-start?
>>
>>
>> *THANKS *in advance for your help
>> Hayk Avetisyan
>>
>
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