GStreamer: problems with seek and mux operations

[Bellaccini, Niccolo]

Hey  Stéphane,

Thank you again for all the information.
So, let me try to explain what I am doing.
First of all, I want to take a video from a source and save it to local
files, splitting the files depending on a maximum time threshold that I
choose. I do this using GStreamer as a C library and building an ad-hoc
pipeline; and it works pretty good for now.
Basically the pipeline I made it's similar to this one (using the
gst-launch tool): > *gst-launch-1.0 videotestsrc !
video/x-raw,width=1280,height=720,framerate=30/1 ! avenc_mpeg4 !
splitmuxsink location=video%02d.mkv max-size-time=60000000000*

Now, from another program, I want to retrieve one or two consecutive videos
(and I want also to concatenate them in that case) previously saved, seek
on the video given a certain start and end position, and save the final
video on the local disk as .mkv or .mp4 video (actually, I want to send the
final video to an AWS S3 bucket but I think that is not the point).

As I said, the problem occurs when I try to seek on the video (read by
splitmuxsrc GStreamer element) and save it to local file, the final video
is not playable with any media player (furthermore when I use matroskamux
as muxer I noticed that the seek function gst_element_seek_simple(...) returns
me false and no seek is performed on the video).

Best regards,

Niccolò

On Fri, Feb 11, 2022 at 6:31 PM stefan cervo <scerveau at gmail.com> wrote:

> Hey Niccolo,
>
> You can give a try to install this package to get nleurisource:
>
> https://packages.ubuntu.com/focal/ges1.0-tools
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__packages.ubuntu.com_focal_ges1.0-2Dtools&d=DwMFaQ&c=MPZC0Rv-kl4oeK4li6Jc92hnsiCC4tOZO_GSKscRWJE&r=q0NOer1O8Xyr6lvRfA9B9on0LnGsWgl35ZFEi2s37Yc8DjlDs22kJZbYHLduupQF&m=cvlHfu51U6_I-jawIs7VyC7M0yhMNyeiDSadir8xmRh_b6j2n0tzSXD0L7nkXnnz&s=Wgj7BoA8BlAHIK-LCUKR72ZLTUQmlgVvvVsTUdpvr5E&e=>
>
> Regarding the splitmuxsrc scenario could you explain in details what you’d
> like to achieve ?
>
> Best regards
>
> Stéphane.
>
>
> Le 11 févr. 2022 à 17:16, Bellaccini, Niccolo <
> niccolo.bellaccini at verizonconnect.com> a écrit :
>
> 
> Hi Stephane,
>
> Thank you very much for the reply. I will surely take a look into gst-editing-services
> as soon as possible.
> I have tried to run the basic pipeline using the nleurisource element but
> it does not work for me because my installation doesn't have the NLE plugin
> on my GStreamer installation (I installed GStreamer on Ubuntu 20.04
> following the instructions here
> https://gstreamer.freedesktop.org/documentation/installing/on-linux.html?gi-language=c
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__gstreamer.freedesktop.org_documentation_installing_on-2Dlinux.html-3Fgi-2Dlanguage-3Dc&d=DwMFaQ&c=MPZC0Rv-kl4oeK4li6Jc92hnsiCC4tOZO_GSKscRWJE&r=q0NOer1O8Xyr6lvRfA9B9on0LnGsWgl35ZFEi2s37Yc8DjlDs22kJZbYHLduupQF&m=cvlHfu51U6_I-jawIs7VyC7M0yhMNyeiDSadir8xmRh_b6j2n0tzSXD0L7nkXnnz&s=1oc5AZ43JrcAomqUAImfskezzZhQxTUTWKWUODHeI3A&e=>
> ). Is there still the NLE plugin?
> I will try in the meanwhile to search about it or maybe to download,
> compile and install the plugin by myself; and just for information, is
> there anything similar to the nleurisource element which takes into
> account multiple files like the splitmuxsrc element?
>
> Best regards,
>
> Niccolò
>
> On Wed, Feb 9, 2022 at 3:58 PM Bellaccini, Niccolo <
> niccolo.bellaccini at verizonconnect.com> wrote:
>
>> Hi,
>>
>> I'm trying to write a pipeline that reads a video from a source file,
>> seeks on that video and finally writes the seeked video to a local file.
>> I used filesrc, decodebin, filesink and a muxer (like matroskamux or
>> mp4mux) as GStreamer elements.
>> I noticed that with some muxer, like matroskamux, the seek operations (as
>> gst_element_seek_simple(...) method) fails and no seek is performed on
>> the final video. Instead, If I use for example another muxer (like mp4mux
>> or avimux) the seek on the final video is performed but this one results
>> not playable by any media player (since in practice is saved as raw data
>> not as video).
>> Am I missing something? Do you know if is it possible to seek on a video
>> read from filesrc and save the seeked video (in playable format) on local?
>>
>> I also send you in attachment the code I'm using for this task in case it
>> could be useful.
>> Thank you,
>>
>> Niccolò
>>
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