到目前为止，这是我在玩的时候想出的：
case GDK_Up:
{
gint64 pos_ns, dur_ns, seek_ns;
GstFormat format;
format = GST_FORMAT_TIME;
gst_element_query_duration(pipeline,&format,&dur_ns);
gst_element_query_position(pipeline,&format,&pos_ns);
g_print ("Time: %" GST_TIME_FORMAT " / %" GST_TIME_FORMAT "\n", GST_TIME_ARGS (pos_ns), GST_TIME_ARGS (dur_ns));
seek_ns = pos_ns + 60*GST_SECOND;
if (!gst_element_seek (pipeline, 1.0, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT,
GST_SEEK_TYPE_SET, seek_ns,
GST_SEEK_TYPE_NONE, GST_CLOCK_TIME_NONE))
{
g_print ("Seek failed!\n");
}
}
break;
这是我的管道：
pipeline = gst_parse_launch("filesrc location=filename.mpg ! decodebin name=decoder decoder. ! queue ! audioconvert ! alsasink decoder. ! deinterlace ! ffmpegcolorspace ! glimagesink",&error);
第一次搜索大约需要 3 秒，到第 5 次或第 6 次搜索需要 15 到 20 秒才能从新位置开始播放。我知道我一定做错了什么，但我无法从文档中弄清楚那是什么。
是我构建管道的方式吗？我意识到我在这里走了一些捷径。
是媒体文件的类型吗？(mpeg2ts) 是媒体文件的长度吗？（4个小时）
文档说：
应用程序在管道上发出搜索，并且在搜索调用返回后立即播放新媒体。
那么是什么让 seek 调用返回需要这么长时间呢？
任何帮助将不胜感激。
更新：
这是调试级别为 2 的调试日志：
(fullscreen02:4554): GLib-GObject-WARNING **: g_object_set_property: property `device-name' of object class `GstAlsaSink' is not writable
0:00:01.137170699 4554 0x9d9500 WARN mpegtsdemux gstmpegtsdemux.c:754:gst_mpegts_demux_fill_stream: AC3 stream type found but no corresponding descriptor to differentiate between AC3 and EAC3. Assuming plain AC3.
0:00:01.179042694 4554 0x9d9500 WARN mpegtsdemux gstmpegtsdemux.c:754:gst_mpegts_demux_fill_stream: AC3 stream type found but no corresponding descriptor to differentiate between AC3 and EAC3. Assuming plain AC3.
0:00:01.188213891 4554 0x7ff9d8023c40 WARN mpegtsdemux gstmpegtsdemux.c:2865:gst_mpegts_demux_src_pad_query:<mpegtsdemux0> unsupported query format or no bitrate yet to approximate duration from bytes
0:00:01.188464979 4554 0x7ff9d80270e0 WARN mpegtsdemux gstmpegtsdemux.c:2865:gst_mpegts_demux_src_pad_query:<mpegtsdemux0> unsupported query format or no bitrate yet to approximate duration from bytes
No accelerated IMDCT transform found
0:00:01.211118745 4554 0x7ff9d8023c40 WARN alsa gstalsa.c:124:gst_alsa_detect_formats:<alsasink0> skipping non-int format
No accelerated IMDCT transform found
0:00:01.237512648 4554 0x7ff9d8023c40 WARN audioconvert gstaudioconvert.c:832:gst_audio_convert_fixate_channels:<audioconvert0> downstream caps contain no channel layout
0:00:01.239176189 4554 0x9dabd0 WARN audioconvert gstaudioconvert.c:832:gst_audio_convert_fixate_channels:<audioconvert0> downstream caps contain no channel layout
0:00:01.273765960 4554 0x7ff9d8023c40 WARN audioconvert gstaudioconvert.c:832:gst_audio_convert_fixate_channels:<audioconvert0> downstream caps contain no channel layout
Got prepare-xwindow-id msg
0:00:01.326878070 4554 0x6068b0 WARN default xoverlay.c:354:gst_x_overlay_set_xwindow_id:<glimagesink0> Using deprecated gst_x_overlay_set_xwindow_id()
0:00:01.326931302 4554 0x6068b0 WARN default xoverlay.c:390:gst_x_overlay_set_window_handle:<glimagesink0> Calling deprecated set_xwindow_id() method
0:00:01.337897164 4554 0x7ff9cc002cd0 WARN bin gstbin.c:2380:gst_bin_do_latency_func:<pipeline0> did not really configure latency of 0:00:00.000000000
0:00:02.042181425 4554 0x7ff9d8023c40 WARN mpegtsdemux gstmpegtsdemux.c:2865:gst_mpegts_demux_src_pad_query:<mpegtsdemux0> unsupported query format or no bitrate yet to approximate duration from bytes
0:00:03.016673305 4554 0x7ff9d8023c40 WARN mpegtsdemux gstmpegtsdemux.c:2865:gst_mpegts_demux_src_pad_query:<mpegtsdemux0> unsupported query format or no bitrate yet to approximate duration from bytes
0:00:04.489319920 4554 0x7ff9d8023c40 WARN mpegtsdemux gstmpegtsdemux.c:2865:gst_mpegts_demux_src_pad_query:<mpegtsdemux0> unsupported query format or no bitrate yet to approximate duration from bytes
0:00:05.961069736 4554 0x7ff9d8023c40 WARN mpegtsdemux gstmpegtsdemux.c:2865:gst_mpegts_demux_src_pad_query:<mpegtsdemux0> unsupported query format or no bitrate yet to approximate duration from bytes
Counter: 0:00:05.930250000 / 3:37:14.178723991 (this is when a 60 sec seek forward was initiated)
0:00:07.300999850 4554 0x7ff9d8023c40 WARN mpegtsdemux gstmpegtsdemux.c:2865:gst_mpegts_demux_src_pad_query:<mpegtsdemux0> unsupported query format or no bitrate yet to approximate duration from bytes
0:00:07.317269896 4554 0x7ff9cc005cd0 WARN bin gstbin.c:2380:gst_bin_do_latency_func:<pipeline0> did not really configure latency of 0:00:00.000000000
0:00:07.641986233 4554 0x9d9500 WARN decodebin gstdecodebin.c:1485:queue_filled_cb:<decoder> Queue is bigger than 20Mbytes, something else is going wrong
0:00:11.059481122 4554 0x7ff9d8023c40 WARN mpegtsdemux gstmpegtsdemux.c:2865:gst_mpegts_demux_src_pad_query:<mpegtsdemux0> unsupported query format or no bitrate yet to approximate duration from bytes
0:00:11.474393831 4554 0x9d9500 WARN decodebin gstdecodebin.c:1485:queue_filled_cb:<decoder> Queue is bigger than 20Mbytes, something else is going wrong
previous line repeated 55 times
0:00:12.532097973 4554 0x7ff9d8023c40 WARN mpegtsdemux gstmpegtsdemux.c:2865:gst_mpegts_demux_src_pad_query:<mpegtsdemux0> unsupported query format or no bitrate yet to approximate duration from bytes
0:00:12.538414925 4554 0x9d9500 WARN decodebin gstdecodebin.c:1485:queue_filled_cb:<decoder> Queue is bigger than 20Mbytes, something else is going wrong
previous line repeated 26 times
Counter: 0:02:05.745916667 / 3:37:14.178723991 (this is when a 60 sec seek forward was initiated)
0:00:13.113363951 4554 0x7ff9cc002c80 WARN bin gstbin.c:2380:gst_bin_do_latency_func:<pipeline0> did not really configure latency of 0:00:00.000000000
0:00:13.116343604 4554 0x7ff9d8023c40 WARN mpegtsdemux gstmpegtsdemux.c:2865:gst_mpegts_demux_src_pad_query:<mpegtsdemux0> unsupported query format or no bitrate yet to approximate duration from bytes
0:00:13.472504323 4554 0x9d9500 WARN decodebin gstdecodebin.c:1485:queue_filled_cb:<decoder> Queue is bigger than 20Mbytes, something else is going wrong
previous line repeated 9 times
0:00:25.545042104 4554 0x7ff9d8023c40 WARN mpegtsdemux gstmpegtsdemux.c:2865:gst_mpegts_demux_src_pad_query:<mpegtsdemux0> unsupported query format or no bitrate yet to approximate duration from bytes
0:00:25.580215323 4554 0x9d9500 WARN decodebin gstdecodebin.c:1485:queue_filled_cb:<decoder> Queue is bigger than 20Mbytes, something else is going wrong
previous line repeated 43 times
我目前正在查找其中一些警告。