v 1.12, Incorrect current position of GstPipeline is reported

[Mathieu Duponchelle]

Dumb question, but is the reported duration correct?

On 03/27/2018 02:20 AM, David Ing wrote:
> I have a gstreamer pipeline which basically incorporates a GESTimeline, two encoders (audio and video), a muxer, and a filesink.
>
> When I run the pipeline, I periodically query the stream position (as shown in code below) and print into the terminal (stdout).
>
> The problem is:  When I run the pipeline, the terminal says that I have reached 100% relatively early (within 2 seconds), but the pipeline itself continues to run for 10 more seconds.  When the terminal reports being 100% done, I can see that the target mp4 file (the final output of the pipeline) is less than 5% of it's final size.
>
> My goal is to get an accurate indication of the job's progress as it runs
>
> Other things I've tried.
>
>   * Tried listening for GST_MESSAGE_PROGRESS messages, but I don't get any.
>   * Tried executing `gst_element_query_position` on the filesink (the last element of the pipeline), instead of the entire pipeline itself, but my results did not change.
>
> The code for my main loop is shown below.  The progress printing occurs near the very bottom of the loop.
>
>     /// Run the job.  Will throw exception if unsuccessful.
>     void CompositionJob::run()
>     {
>         GstStateChangeReturn stateChangeReturn;
>         
>         //  Start playing the pipeline.
>         stateChangeReturn = gst_element_set_state(reinterpret_cast<GstElement*>(this->gstPipeline), GST_STATE_PLAYING);
>         if (stateChangeReturn == GST_STATE_CHANGE_FAILURE)
>             throw std::runtime_error("Unable to set the pipeline to the playing state.");
>
>         //  Talk to the message bus
>         this->gstBus = gst_element_get_bus(reinterpret_cast<GstElement*>(this->gstPipeline));
>         unique_gmob<GstMessage> gstMessage = nullptr;
>         
>         this->shouldTerminate = false;
>         while (!this->shouldTerminate)
>         {
>             gstMessage = gst_bus_timed_pop_filtered(this->gstBus, 100 * GST_MSECOND,
>                 (GstMessageType)(GST_MESSAGE_STATE_CHANGED | GST_MESSAGE_ERROR | GST_MESSAGE_EOS | GST_MESSAGE_DURATION));
>
>             if (gstMessage)
>             {
>                 this->handleMessage(gstMessage.get());
>                 gstMessage.reset();
>             }
>             else
>             {
>                 //  If we got no message, a timeout period has expired.
>                 if (this->isPlaying)
>                 {
>                     // Query the stream position (in nanoseconds).
>                     if (!gst_element_query_position(
>                             reinterpret_cast<GstElement*>(this->gstPipeline),
>                             GST_FORMAT_TIME,
>                             &this->streamPosition))
>                         GST_DEBUG("Could not query current position.");
>
>                     // Query the duration if we don't have it already.
>                     if (!GST_CLOCK_TIME_IS_VALID(this->streamDuration))
>                     {
>                         if (!gst_element_query_duration(
>                                 reinterpret_cast<GstElement*>(this->gstPipeline),
>                                 GST_FORMAT_TIME,
>                                 &this->streamDuration))
>                             GST_DEBUG("Could not get pipeline duration.");
>                     }
>
>                     //  Print position and duration.
>                     if (this->printProgress)
>                     {
>                         g_print("Position %" GST_TIME_FORMAT " / %" GST_TIME_FORMAT "\r",
>                             GST_TIME_ARGS(this->streamPosition), GST_TIME_ARGS(this->streamDuration));
>                     }
>                 }
>             }
>         }
>     }
>
>
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