==76355== Thread 55 MediaPD~oder #1:
==76355== Conditional jump or move depends on uninitialised value(s)
==76355==    at 0x2D87F9D8: ff_h2645_extract_rbsp (h2645_parse.c:56)
==76355==    by 0x2D87FEA3: ff_h2645_packet_split (h2645_parse.c:329)
==76355==    by 0x2D8BCBAE: decode_extradata_ps (h264_parse.c:358)
==76355==    by 0x2D8BE37F: ff_h264_decode_extradata (h264_parse.c:399)
==76355==    by 0x2D63DCCE: h264_decode_init (h264dec.c:416)
==76355==    by 0x2DC45A15: avcodec_open2 (utils.c:1023)
==76355==    by 0x11C975C4: mozilla::FFmpegDataDecoder<57>::InitDecoder() (FFmpegDataDecoder.cpp:99)
==76355==    by 0x11C99B81: mozilla::FFmpegVideoDecoder<57>::Init() (FFmpegVideoDecoder.cpp:141)
==76355==    by 0x11C67E75: mozilla::detail::ProxyFunctionRunnable<mozilla::MediaChangeMonitor::Init()::$_0, mozilla::MozPromise<mozilla::TrackInfo::TrackType, mozilla::MediaResult, true> >::Run() (MediaChangeMonitor.cpp:235)
==76355==    by 0xFD43DB3: mozilla::TaskQueue::Runner::Run() (TaskQueue.cpp:199)
==76355==    by 0xFD54423: nsThreadPool::Run() (nsThreadPool.cpp:241)
==76355==    by 0xFD5456C: non-virtual thunk to nsThreadPool::Run() (nsThreadPool.cpp:0)
==76355==  Uninitialised value was created by a heap allocation
==76355==    at 0x4C32373: memalign (vg_replace_malloc.c:908)
==76355==    by 0x4C32476: posix_memalign (vg_replace_malloc.c:1072)
==76355==    by 0x2EF27762: av_malloc (in /usr/lib/x86_64-linux-gnu/libavutil.so.55.78.100)
==76355==    by 0x11C9750A: mozilla::FFmpegDataDecoder<57>::InitDecoder() (FFmpegDataDecoder.cpp:82)
==76355==    by 0x11C99B81: mozilla::FFmpegVideoDecoder<57>::Init() (FFmpegVideoDecoder.cpp:141)
==76355==    by 0x11C67E75: mozilla::detail::ProxyFunctionRunnable<mozilla::MediaChangeMonitor::Init()::$_0, mozilla::MozPromise<mozilla::TrackInfo::TrackType, mozilla::MediaResult, true> >::Run() (MediaChangeMonitor.cpp:235)
==76355==    by 0xFD43DB3: mozilla::TaskQueue::Runner::Run() (TaskQueue.cpp:199)
==76355==    by 0xFD54423: nsThreadPool::Run() (nsThreadPool.cpp:241)
==76355==    by 0xFD5456C: non-virtual thunk to nsThreadPool::Run() (nsThreadPool.cpp:0)
==76355==    by 0xFD50D47: nsThread::ProcessNextEvent(bool, bool*) (nsThread.cpp:1179)
==76355==    by 0xFD52EA7: NS_ProcessNextEvent(nsIThread*, bool) (nsThreadUtils.cpp:482)
==76355==    by 0x101E464C: mozilla::ipc::MessagePumpForNonMainThreads::Run(base::MessagePump::Delegate*) (MessagePump.cpp:333)

Nils, who should take a look?

ffmpeg related issue.

I would like to work on this issue and start working on it. Please assign to me if possible. Thanks.