Ijkplayer: 视频在暂停后继续播放时发现currentPlaybackTime不准确

[ZhouYing-bit]

IJKMediaPlayback.h 中的 @property(nonatomic) NSTimeInterval currentPlaybackTime;

我最近在做一个智能硬件,硬件是根据视频播放时间来执行动作的,我用一条线程来监控currentPlaybackTime, 发现视频播放在暂停后继续播放时currentPlaybackTime有跳变.

具体情况是:比如我暂停时currentPlaybackTime为52.194000, 继续播放时时间为111.872000,但是很快时间就恢复正常了,这个不正常的currentPlaybackTime大概会持续100ms, 这虽然影响不大,但我想这是一个bug.

下面是我的贴上的调试log, 有需要请对比playing前后的time值.

2016-06-20 09:43:29.085 [654:149705] index=1038 time=51.915000
2016-06-20 09:43:29.144 [654:149705] index=1039 time=51.973000
2016-06-20 09:43:29.196 [654:149705] index=1040 time=52.026000
2016-06-20 09:43:29.248 [654:149705] index=1041 time=52.078000
2016-06-20 09:43:29.308 [654:149705] index=1042 time=52.138000
ijkmp_pause()
ijkmp_pause()=0
2016-06-20 09:43:29.364 [654:149705] index=1043 time=52.194000
ijkmp_get_msg: FFP_REQ_PAUSE
aout_pause_audio(1)
2016-06-20 09:43:29.397 [654:149622] IJKMPMoviePlayBackStateDidChange 2: paused
ijkmp_start()
ijkmp_start()=0
ijkmp_get_msg: FFP_REQ_START
aout_pause_audio(0)
2016-06-20 09:44:29.035 [654:149622] IJKMPMoviePlayBackStateDidChange 1: playing
2016-06-20 09:44:29.042 [654:149705] index=2237 time=111.872000
2016-06-20 09:44:29.095 [654:149705] index=2238 time=111.925000
2016-06-20 09:44:29.168 [654:149705] index=1045 time=52.290000
2016-06-20 09:44:29.219 [654:149705] index=1046 time=52.341000
2016-06-20 09:44:29.281 [654:149705] index=1048 time=52.403000
2016-06-20 09:44:29.340 [654:149705] index=1049 time=52.462000

[bbcallen]

It's a known issue, and No good solution, for now.

[yuazhen]

my solution is #1019

[ZhouYing-bit]

@bbcallen @yuazhen
ok, thank you very much, I am very glad to get your response.

[SjAndy88]

关注这个问题，用户体验感觉不是很好。 暂停后在恢复播放，进度会跳变下，打log发现是getCurrentPosition()的值有个跳动。

[wtwmiao]

同样遇到这个问题,调试代码发现is->paused = is->audclk.paused = is->vidclk.paused = is->extclk.paused = pause_on;
音频时钟过早设置为 非暂停状态. 而此时 音频线程还未真正开始工作.此时调用 get_clock 返回时间就是 暂停到现在 经过的时间.c->pts_drift 保存的是暂停时,设置的值.

[xinzhengzhang]

ffplay was designed in an asynchronous mode.
This issue will not be solved unless ijk abandon the ffplay.
You have to find some ugly workaround for this...