[PageRecord::StartPage] Starting page ...
[PageRecord::StartPage] Started page.
[PageRecord::StartOutput] Starting output ...
[Muxer::Init] Using format webm (WebM).
[Muxer::AddStream] Using codec libx264 (libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10).
[BaseEncoder::EncoderThread] Encoder thread started.
[Muxer::AddStream] Using codec libvorbis (libvorbis Vorbis).
[BaseEncoder::EncoderThread] Encoder thread started.
[Muxer::Start] Error: Can't write header!
[BaseEncoder::~BaseEncoder] Stopping encoder thread ...
[BaseEncoder::EncoderThread] Encoder thread stopped.
[BaseEncoder::~BaseEncoder] Stopping encoder thread ...
[BaseEncoder::EncoderThread] Encoder thread stopped.
[PageRecord::StartOutput] Error: Something went wrong during initialization.
[PageRecord::StartOutput] Starting output ...
[Muxer::Init] Using format webm (WebM).
[Muxer::AddStream] Using codec libx264 (libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10).
[BaseEncoder::EncoderThread] Encoder thread started.
[Muxer::AddStream] Using codec libvorbis (libvorbis Vorbis).
[Muxer::Start] Error: Can't write header!
[BaseEncoder::EncoderThread] Encoder thread started.
[BaseEncoder::~BaseEncoder] Stopping encoder thread ...
[BaseEncoder::EncoderThread] Encoder thread stopped.
[BaseEncoder::~BaseEncoder] Stopping encoder thread ...
[BaseEncoder::EncoderThread] Encoder thread stopped.
[PageRecord::StartOutput] Error: Something went wrong during initialization.