(gdb) bt
#0  0x0000555557b29bf2 in media::FFmpegGlue::FFmpegGlue(media::FFmpegURLProtocol*) ()
#1  0x0000555557b22ae7 in media::FFmpegDemuxer::Initialize(media::DemuxerHost*, base::OnceCallback<void (media::PipelineStatus)>) ()
#2  0x0000555557a80c1b in media::PipelineImpl::RendererWrapper::InitializeDemuxer(base::OnceCallback<void (media::PipelineStatus)>) ()
#3  0x0000555557a85a30 in base::internal::Invoker<base::internal::BindState<void (media::PipelineImpl::RendererWrapper::*)(base::OnceCallback<void (media::PipelineStatus)>), base::WeakPtr<media::PipelineImpl::RendererWrapper> >, void (base::OnceCallback<void (media::PipelineStatus)>)>::RunOnce(base::internal::BindStateBase*, base::OnceCallback<void (media::PipelineStatus)>&&) ()
#4  0x0000555557a89d5f in media::SerialRunner::RunNextInSeries(media::PipelineStatus) ()
#5  0x0000555557a89fae in media::SerialRunner::Run(media::SerialRunner::Queue&&, base::OnceCallback<void (media::PipelineStatus)>) ()
#6  0x0000555557a80810 in media::PipelineImpl::RendererWrapper::Start(media::Pipeline::StartType, media::Demuxer*, std::unique_ptr<media::Renderer, std::default_delete<media::Renderer> >, base::WeakPtr<media::PipelineImpl>) ()
#7  0x0000555557a87bd2 in base::internal::Invoker<base::internal::BindState<void (media::PipelineImpl::RendererWrapper::*)(media::Pipeline::StartType, media::Demuxer*, std::unique_ptr<media::Renderer, std::default_delete<media::Renderer> >, base::WeakPtr<media::PipelineImpl>), base::internal::UnretainedWrapper<media::PipelineImpl::RendererWrapper>, media::Pipeline::StartType, media::Demuxer*, std::unique_ptr<media::Renderer, std::default_delete<media::Renderer> >, base::WeakPtr<media::PipelineImpl> >, void ()>::RunOnce(base::internal::BindStateBase*) ()
#8  0x0000555559ecba8c in base::TaskAnnotator::RunTask(char const*, base::PendingTask*) ()
#9  0x0000555559edc009 in base::sequence_manager::internal::ThreadControllerWithMessagePumpImpl::DoWork() ()
#10 0x0000555559e9228c in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) ()
#11 0x0000555559edc7f4 in base::sequence_manager::internal::ThreadControllerWithMessagePumpImpl::Run(bool, base::TimeDelta) ()
#12 0x0000555559eb573a in base::RunLoop::Run() ()
#13 0x0000555559ef2606 in base::Thread::ThreadMain() ()
#14 0x0000555559f31675 in base::(anonymous namespace)::ThreadFunc(void*) ()
#15 0x00007ffff7f7ff27 in start_thread (arg=<optimized out>) at pthread_create.c:479
#16 0x00007ffff473a67f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95