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Seek operation

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Sumanth V

Seek operation

Hi All,
I am writing a application which dose a trickmode operation on the stored file. When i do PAUSE and then PLAY it resumes play from where i had PAUSED. But when i do seek forward by setting the rate to 2.0 / 4.0 FORWARD happens but when i press PLAY the play back dose not resume from where i pressed PLAY but instead starts playing from offset where i had selected to forward.
To play while forwarding i send this seek event.

gst_element_seek( pipeline, 1.0,GST_FORMAT_TIME ,GST_SEEK_FLAG_FLUSH ,
GST_SEEK_TYPE_CUR, 0, GST_SEEK_TYPE_NONE, -1 );

Is this this the correct seek event format??

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michael smith-6-3

Re: Seek operation

On Wed, Dec 24, 2008 at 12:19 AM, Sumanth V <[hidden email]> wrote:

> Hi All,
> I am writing a application which dose a trickmode operation on the
> stored file. When i do PAUSE and then PLAY it resumes play from where i had
> PAUSED. But when i do seek forward by setting the rate to 2.0 / 4.0 FORWARD
> happens but when i press PLAY the play back dose not resume from where i
> pressed PLAY but instead starts playing from offset where i had selected to
> forward.
> To play while forwarding i send this seek event.
>
> gst_element_seek( pipeline, 1.0,GST_FORMAT_TIME ,GST_SEEK_FLAG_FLUSH ,
> GST_SEEK_TYPE_CUR, 0,
> GST_SEEK_TYPE_NONE, -1 );

That's because you're doing a flushing seek. Remove
GST_SEEK_FLAG_FLUSH to avoid flushing the pipeline.

Mike

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Eric Zhang-6

Re: Seek operation

In reply to this post by Sumanth V

Hi, gstreamer-devel:

Did your seek operation succeed? Which state do you seek the pipeline? PAUSED or PLAYING? Maybe you can describe your steps more clearly.

Eric Zhang

2008/12/24 Sumanth V <[hidden email]>

Hi All,
I am writing a application which dose a trickmode operation on the stored file. When i do PAUSE and then PLAY it resumes play from where i had PAUSED. But when i do seek forward by setting the rate to 2.0 / 4.0 FORWARD happens but when i press PLAY the play back dose not resume from where i pressed PLAY but instead starts playing from offset where i had selected to forward.
To play while forwarding i send this seek event.

gst_element_seek( pipeline, 1.0,GST_FORMAT_TIME ,GST_SEEK_FLAG_FLUSH ,
GST_SEEK_TYPE_CUR, 0, GST_SEEK_TYPE_NONE, -1 );

Is this this the correct seek event format??

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Sumanth V

Re: Seek operation

Thanks for your reply..

When i want to do PAUSE operation i send
gst_element_set_state (pipeline, GST_STATE_PAUSED)..

when i want to do FORWARD operation i send the following seek event.
gst_element_set_state (pipeline, GST_STATE_PLAYING);
RetVal = gst_element_seek( pipeline,4.0, GST_FORMAT_TIME, GST_SEEK_FLAG_NONE, GST_SEEK_TYPE_NONE, 0, GST_SEEK_TYPE_NONE, -1 );

forward operation dose happen but it takes some time( after few seconds ). when in FORWARD
i PAUSE the operation by gst_element_set_state (pipeline, GST_STATE_PAUSED).

now i want to resume the play in normal speed i do the following:-

gst_element_set_state (pipeline, GST_STATE_PLAYING);
RetVal = gst_element_seek( pipeline, 1.0,GST_FORMAT_TIME , GST_SEEK_FLAG_NONE,GST_SEEK_TYPE_CUR, 0, GST_SEEK_TYPE_NONE, -1 );

but still it dose not resume the play from position where i had PAUSEd in FORWARD mode, but instead it resume the Play back from where i had pressed PAUSE before performing FORWARD operation.

is it the right way of performing the seek operation? previously i used to use the GST_SEEK_FLAG_FLUSH, now i have removed it, but still its playing from the wrong offset.

Thanks.

On Thu, Dec 25, 2008 at 3:13 PM, Eric Zhang <[hidden email]> wrote:

Hi, gstreamer-devel:

    Did your seek operation succeed? Which state do you seek the pipeline? PAUSED or PLAYING? Maybe you can describe your steps more clearly.

Eric Zhang

2008/12/24 Sumanth V <[hidden email]>

Hi All,
       I am writing a application which dose a trickmode operation on the stored file. When i do PAUSE and then PLAY it resumes play from where i had PAUSED. But when i do seek forward by setting the rate to 2.0 / 4.0 FORWARD happens but when i press PLAY the play back dose not resume from where i pressed PLAY but instead starts playing from offset where i had selected to forward.
To play while forwarding i send this seek event.

gst_element_seek( pipeline, 1.0,GST_FORMAT_TIME ,GST_SEEK_FLAG_FLUSH ,
                                               GST_SEEK_TYPE_CUR, 0, GST_SEEK_TYPE_NONE, -1 );

Is this this the correct seek event format??

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Eric Zhang-6

Re: Seek operation

Hi, gstreamer-devel:

Read the GstSeekType manual:

GST_SEEK_TYPE_CUR -- change relative to currently configured segment. This can't be used to seek relative to the current playback position - do a position query, calculate the desired position and then do an absolute position seek instead if that's what you want to do.

Got it? GST_SEEK_TYPE_CUR is not current playback position, it's currently configured segment. That's why your issue occurs.

Eric Zhang

2008/12/25 Sumanth V <[hidden email]>

Thanks for your reply..

   When i want to do PAUSE operation i send
gst_element_set_state (pipeline, GST_STATE_PAUSED)..

when i want to do FORWARD operation i send the following seek event.
gst_element_set_state (pipeline, GST_STATE_PLAYING);
RetVal = gst_element_seek( pipeline,4.0, GST_FORMAT_TIME, GST_SEEK_FLAG_NONE, GST_SEEK_TYPE_NONE, 0, GST_SEEK_TYPE_NONE, -1 );

forward operation dose happen but it takes some time( after few seconds ). when in FORWARD
i PAUSE the operation by gst_element_set_state (pipeline, GST_STATE_PAUSED).

now i want to resume the play in normal speed i do the following:-

gst_element_set_state (pipeline, GST_STATE_PLAYING);
RetVal = gst_element_seek( pipeline, 1.0,GST_FORMAT_TIME , GST_SEEK_FLAG_NONE,GST_SEEK_TYPE_CUR, 0, GST_SEEK_TYPE_NONE, -1 );

but still it dose not resume the play from position where i had PAUSEd in FORWARD mode, but instead it resume the Play back from where i had pressed PAUSE before performing FORWARD operation.

is it the right way of performing the seek operation? previously i used to use the GST_SEEK_FLAG_FLUSH, now i have removed it, but still its playing from the wrong offset.

Thanks.

On Thu, Dec 25, 2008 at 3:13 PM, Eric Zhang <[hidden email]> wrote:

Hi, gstreamer-devel:

    Did your seek operation succeed? Which state do you seek the pipeline? PAUSED or PLAYING? Maybe you can describe your steps more clearly.

Eric Zhang

2008/12/24 Sumanth V <[hidden email]>

Hi All,
       I am writing a application which dose a trickmode operation on the stored file. When i do PAUSE and then PLAY it resumes play from where i had PAUSED. But when i do seek forward by setting the rate to 2.0 / 4.0 FORWARD happens but when i press PLAY the play back dose not resume from where i pressed PLAY but instead starts playing from offset where i had selected to forward.
To play while forwarding i send this seek event.

gst_element_seek( pipeline, 1.0,GST_FORMAT_TIME ,GST_SEEK_FLAG_FLUSH ,
                                               GST_SEEK_TYPE_CUR, 0, GST_SEEK_TYPE_NONE, -1 );

Is this this the correct seek event format??

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