快速连续几次取消开始，就crash了，怎么处理啊

[mywaver]

A/libc: Fatal signal 11 (SIGSEGV) in tid 31285 (RxCachedThreadS)
30994-A/art: art/runtime/java_vm_ext.cc:470] JNI DETECTED ERROR IN APPLICATION: thread Thread

[36,tid=31245,Native,Thread*=0x91ff6500,peer=0x132d99d0,"RxCachedThreadScheduler-4"] using JNIEnv* from thread Thread

[36,tid=31245,Native,Thread*=0x91ff6500,peer=0x132d99d0,"RxCachedThreadScheduler-4"]
30994-=A/art: art/runtime/java_vm_ext.cc:470] in call to FindClass
t: art/runtime/java_vm_ext.cc:470] from int io.microshow.rxffmpeg.RxFFmpegInvoke.runFFmpegCmd(java.lang.String[])
30994-31245/ A/art: art/runtime/java_vm_ext.cc:470] "RxCachedThreadScheduler-4" daemon prio=5 tid=36 Runnable
30994-31245/ A/art: art/runtime/java_vm_ext.cc:470] | group="main" sCount=0 dsCount=0 obj=0x132d99d0 self=0x91ff6500
2019-08-16 11:11:45.012 30994-31245/A/art: art/runtime/java_vm_ext.cc:470] | sysTid=31245 nice=0 cgrp=default sched=0/0 handle=0x8e9ff920
2019-08-16 11:11:45.012 30994-31245/ A/art: art/runtime/java_vm_ext.cc:470] | state=R schedstat=( 983705011 516099846 448 ) utm=89 stm=9 core=3 HZ=100
2019-08-16 11:11:45.012 30994-31245/A/art: art/runtime/java_vm_ext.cc:470] | stack=0x8e8fd000-0x8e8ff000 stackSize=1038KB
2019-08-16 11:11:45.012 30994-31245/ A/art: art/runtime/java_vm_ext.cc:470] | held mutexes= "mutator lock"(shared held)
2019-08-16 11:11:45.012 30994-31245/A/art: art/runtime/java_vm_ext.cc:470] at io.microshow.rxffmpeg.RxFFmpegInvoke.runFFmpegCmd(Native method)
2019-08-16 11:11:45.012 30994-31245 A/art: art/runtime/java_vm_ext.cc:470] at io.microshow.rxffmpeg.RxFFmpegInvoke$2.subscribe(RxFFmpegInvoke.java:115)
2019-08-16 11:11:45.012 30994-31245/ A/art: art/runtime/java_vm_ext.cc:470] at io.reactivex.internal.operators.flowable.FlowableCreate.subscribeActual

(FlowableCreate.java:71)
2019-08-16 11:11:45.012 30994-31245/ A/art: art/runtime/java_vm_ext.cc:470] at io.reactivex.Flowable.subscribe(Flowable.java:14636)
2019-08-16 11:11:45.012 30994-31245/ A/art: art/runtime/java_vm_ext.cc:470] at io.reactivex.Flowable.subscribe(Flowable.java:14583)
2019-08-16 11:11:45.013 30994-31245/ A/art: art/runtime/java_vm_ext.cc:470] at io.reactivex.internal.operators.flowable.FlowableSubscribeOn

$SubscribeOnSubscriber.run(FlowableSubscribeOn.java:82)
2019-08-16 11:11:45.013 30994-31245/ A/art: art/runtime/java_vm_ext.cc:470] at io.reactivex.internal.schedulers.ScheduledRunnable.run(ScheduledRunnable.java:66)
2019-08-16 11:11:45.013 30994-31245/ A/art: art/runtime/java_vm_ext.cc:470] at io.reactivex.internal.schedulers.ScheduledRunnable.call(ScheduledRunnable.java:57)
2019-08-16 11:11:45.013 30994-31245/ A/art: art/runtime/java_vm_ext.cc:470] at java.util.concurrent.FutureTask.run(FutureTask.java:237)
2019-08-16 11:11:45.013 30994-31245/ A/art: art/runtime/java_vm_ext.cc:470] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run

(ScheduledThreadPoolExecutor.java:272)
2019-08-16 11:11:45.013 30994-31245/ A/art: art/runtime/java_vm_ext.cc:470] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
2019-08-16 11:11:45.013 30994-31245/ A/art: art/runtime/java_vm_ext.cc:470] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
2019-08-16 11:11:45.013 30994-31245/A A/art: art/runtime/java_vm_ext.cc:470] at java.lang.Thread.run(Thread.java:776)
2019-08-16 11:11:45.013 30994-31245/A/art: art/runtime/java_vm_ext.cc:470]
2019-08-16 11:11:45.115 31286-31286/? A/DEBUG: *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
2019-08-16 11:11:45.115 31286-31286/? A/DEBUG: Build fingerprint: 'HUAWEI/SLA-AL00/HWSLA-Q:7.0/HUAWEISLA-AL00/C00B204:user/release-keys'
2019-08-16 11:11:45.115 31286-31286/? A/DEBUG: Revision: '0'
2019-08-16 11:11:45.115 31286-31286/? A/DEBUG: ABI: 'arm'
2019-08-16 11:11:45.116 31286-31286/? A/DEBUG: pid: 30994, tid: 31285, name: RxCachedThreadS >>> xxxxxxxxxxxx <<<
2019-08-16 11:11:45.116 31286-31286/? A/DEBUG: signal 11 (SIGSEGV), code 0 (SI_USER), fault addr 0x7912
2019-08-16 11:11:45.116 31286-31286/? A/DEBUG: r0 00000000 r1 97b9acfc r2 94787f78 r3 97b9acfc
2019-08-16 11:11:45.116 31286-31286/? A/DEBUG: r4 902ff100 r5 00000000 r6 94787f20 r7 00000000
2019-08-16 11:11:45.116 31286-31286/? A/DEBUG: r8 97b9acfc r9 94788168 sl a64e5420 fp 94787f78
2019-08-16 11:11:45.116 31286-31286/? A/DEBUG: ip 00000000 sp 94787ef0 lr 00000000 pc b5f4d5f4 cpsr 280f0030
2019-08-16 11:11:45.118 31286-31286/? A/DEBUG: backtrace:
2019-08-16 11:11:45.118 31286-31286/? A/DEBUG: #00 pc 000465f4 /system/lib/libc.so (strspn+11)
2019-08-16 11:11:45.118 31286-31286/? A/DEBUG: #1 pc 0076379c /data/app/xxxxxxxxxx-1/lib/arm/librxffmpeg-core.so (avfilter_graph_parse2+64)

[microshow]

建议在上层控制处理 ， ffmpeg底层不允许同时执行多次的，里面很多全局的变量

[IHansan]

RxFFmpegInvoke.getInstance().onCancel();
//取消后加上这句好像就不报错了
RxFFmpegInvoke.getInstance().exit();