c - gstreamer gst_element_seek 在 mpeg2ts 上非常慢

Question

这是我到目前为止想出的边玩边找的方法:

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);

第一个搜索将需要大约 3 秒的时间来执行，到第 5 或第 6 个搜索时，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。

这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 小时)

文档说:

应用程序在管道上发出搜索，搜索调用返回后立即播放新媒体。

那么为什么 seek 调用需要这么长时间才能返回？

如有任何帮助，我们将不胜感激。

更新:

这是调试级别 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。

Answer 1

您的管道看起来不错。对 mpegts 元素进行了大量优化。您的 gstreamer 安装是否最新。如果您的安装是最新的，您可以运行诸如 oprofile 之类的分析器来查看是否存在热点。您还可以检查 gstreamer 调试日志，看看是否有关于该文件的任何投诉。