Rewind a pipeline

[Stefan Sauer]

On 05/28/2013 08:36 AM, Jorge Fernandez Monteagudo wrote:
> Hi Stefan!
>
> That will be perfect because I'm looking for a playing loop mode. I've been doing some test but I'm not able to 
> get the loop mode working... This is what I'm doing:
>
> in main
>
>   // Create main loop.
>   decoding_data.loop = g_main_loop_new( NULL, FALSE );
>
>   // Create pipeline.
>   decoding_data.pipeline = get_pipeline( file_video );
>   if( decoding_data.pipeline == NULL ) {
>     printf( "Error creating pipeline! Exiting...\n" );
>     return 1;
>   }
>
>   // Play new pipeline.
>   printf( "Going to play...\n" );
>   gst_element_seek( decoding_data.pipeline, 1.0, GST_FORMAT_TIME,
>                     (GstSeekFlags)(GST_SEEK_FLAG_SEGMENT | GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE),
>                     GST_SEEK_TYPE_SET, 0, GST_SEEK_TYPE_END, 0);
>
>   ret = gst_element_set_state( decoding_data.pipeline, GST_STATE_PLAYING );
>   if( ret == GST_STATE_CHANGE_FAILURE ) {
>     printf( "Failed to start up pipeline!\n" );
>     return 1;
>   }
>
>   // Endless loop.
>   main_loop();
>
>
> and in the bus messages handler
>
> static GstBusSyncReply on_sync_message( GstBus *bus, GstMessage *msg, gpointer data )
> {
>   DecodingPrivateData *priv = (DecodingPrivateData *)data;

Oh, and I am not sure if it is safe to seek from the sync handler. If
the pipeline deadlocks it is not and you shoudl try the async_message
handler.

Stefan
>
>   // Handle other messages on the bus.
>   GstBusSyncReply ret = GST_BUS_PASS;
>   switch( GST_MESSAGE_TYPE( msg ) ) {
>     case GST_MESSAGE_EOS:
>       printf( "End-of-stream\n" );
>       priv->eos_detected = 1;
>       ret = GST_BUS_DROP;
>       break;
>
>     case GST_MESSAGE_SEGMENT_DONE:
>       printf( "Looping on segment done\n" );
>       gst_element_seek( priv->pipeline, 1.0, GST_FORMAT_TIME,
>                         (GstSeekFlags)(GST_SEEK_FLAG_SEGMENT | GST_SEEK_FLAG_ACCURATE),
>                         GST_SEEK_TYPE_SET, 0, GST_SEEK_TYPE_END, 0);
>       break;
>
>     case GST_MESSAGE_ERROR:
>       {
>         gchar *debug = NULL;
>         GError *err = NULL;
>
>         gst_message_parse_error( msg, &err, &debug );
>         printf( "Error: %s\n", err->message );
>         g_error_free( err );
>
>         if( debug ) {
>           printf( "Debug details: %s\n", debug );
>           g_free( debug );
>         }
>
>         priv->error_detected = 1;
>         ret = GST_BUS_DROP;
>         break;
>       }
>     default:
>       break;
>   }
>
>   return ret;
> }
>
> I've tried doing the seek before and after gst_element_set_state( decoding_data.pipeline, GST_STATE_PLAYING )
> with the same result. The video is played once and I only get the GST_MESSAGE_EOS message! What am I missing?
>
>
> Thanks!
>
> ________________________________________
> From: gstreamer-devel-bounces+jorgefm=cirsa.com at lists.freedesktop.org [gstreamer-devel-bounces+jorgefm=cirsa.com at lists.freedesktop.org] On Behalf Of Stefan Sauer [ensonic at hora-obscura.de]
> Sent: Sunday, May 26, 2013 12:16 PM
> To: gstreamer-devel at lists.freedesktop.org
> Subject: Re: Rewind a pipeline
>
> On 05/20/2013 03:41 PM, Jorge Fernandez Monteagudo wrote:
>> Answering myself I've seen using GST_DEBUG that the event is ignored. First I have to set the
>> pipeline in GST_STATE_PLAYING then send the seek event and now it works!
> If you go to playing again, you should not need to seek. If you want to
> play in a loop, you can seek with the SEGMENT flag initially and then
> wait for SEGMENT_DONE on the bus (instead of EOS) and seek again. The
> continuation seek won't need the FLUSH flag. This way you get seamless
> loops.
>
> Stefan
>> Sorry for disturbing the list!
>>
>> ________________________________________
>> From: gstreamer-devel-bounces+jorgefm=cirsa.com at lists.freedesktop.org [gstreamer-devel-bounces+jorgefm=cirsa.com at lists.freedesktop.org] On Behalf Of Jorge Fernandez Monteagudo [jorgefm at cirsa.com]
>> Sent: Monday, May 20, 2013 3:27 PM
>> To: gstreamer-devel at lists.freedesktop.org
>> Subject: Rewind a pipeline
>>
>> Hi all!
>>
>> Is it possible to reuse a pipeline? I would like to avoid creating and destroying a pipeline when I
>> want to have a video playing in a loop. How can I do that? When I try to send a seek event I
>> always get an error. The next code always print "Send seek event failed!"
>>
>>     // Set the pipeline ready.
>>     ret = gst_element_set_state( pipeline, GST_STATE_READY );
>>     if( ret == GST_STATE_CHANGE_FAILURE ) {
>>       printf( "Failed to start up pipeline!\n" );
>>       done = 1;
>>       return;
>>     }
>>
>>     // Seek the stream init.
>>     GstEvent *seek_event = NULL;
>>
>>     seek_event = gst_event_new_seek( 1.0, GST_FORMAT_TIME,
>>                                      (GstSeekFlags)(GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT),
>>                                      GST_SEEK_TYPE_SET, 0LL,
>>                                      GST_SEEK_TYPE_NONE, GST_CLOCK_TIME_NONE );
>>     if( gst_element_send_event( pipeline, seek_event ) == false ) {
>>       printf( "Send seek event failed!\n" );
>>       done = 1;
>>       return;
>>     }
>>
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