Hello everybody,
Wowza Streaming Engine version 4.9.7 has been released and this contains a number of security fixes, transcoder updates additional closed caption support.
Please find the release notes HERE and a list of the changes since the last release 4.9.6 below:
- Updated the default CPU transcoder implementation to use MainConcept SDK version 16.0.
- Integrated the MainConcept Easy Video API (EVA) as foundational groundwork for future NVIDIA-accelerated transcoding.
- Added the ability to convert HEVC/H.265 10-bit content to 8-bit for compatibility with SDR workflows and legacy devices.
- Added support to ingest HEVC/H.265 10-bit HDR10 content and transcode it to HEVC/H.265 10-bit without HDR metadata (SDR).
- Added captions support for CEA-608, CEA-708, and WebVTT formats for CMAF HLS and CMAF MPEG-DASH packaging workflows and live streams.
- Improved webhook support for streaming notifications by adding a retry mechanism, advanced webhook logging, and server error logging for system events.
- Added an mpeg4IgnoreMarkerBitErrors property to allow the decoder to bypass marker-bit validation errors in MPEG-4 packets that would otherwise cause exceptions during decoding.
- Resolved an issue where NVIDIA GPUs were not detected when using open source driver variants (version 550 and later).
- Fixed a transcoder crash issue with MainConcept library update.
- Fixed an issue where CEA-708 captions were not displaying due to carriage return (CR) and end of text (ETX) commands not being handled correctly.
- Fixed an issue where master playlists were not being created for audio-only HLS targets, preventing playback.
- Fixed CVE-2025-55752 relative path traversal vulnerability in Apache Tomcat.
- Fixed CVE-2025-55754 for improper neutralization of escape, meta, or control sequences vulnerability in Apache Tomcat.
- Fixed an issue where WebVTT cues generated during HLS playback sometimes disappear prematurely, affecting caption synchronization.
- Fixed an issue where WebRTC connections with Secure Token enabled always included the application instance name in the hash check and streamInfo response, even when it’s not specified in the player request.
- Fixed an issue introduced in Wowza Streaming Engine 4.8.13 that caused exceptions during MPEG-4 video decoding and prevented transcoded streams from being playable.
- Fixed an issue where Transcoder overlays were not positioned correctly when using multiple overlays with identical offset values.
- Fixed an issue in Wowza Streaming Engine 4.9.1 where MPEG-TS filter entries for SRT stream files were not displayed in the Manager UI, even though updates to the filters were successfully applied.
- Fixed an issue where thumbnail generation failed on ARM-based images, resulting in empty thumbnail responses and errors such as thumbnailerGetVideoFrame: Response empty.
- Fixed an issue where enabling the section in VHost.xml after upgrading from Wowza Streaming Engine 4.9.3 (or earlier) to 4.9.5 (and later) caused the server to stop listening on port 1935, preventing RTMP and RTSP streaming.
- Fixed an issue where the Stream Targets page could load slowly or fail due to redundant REST API calls and an unintended global AJAX timeout.
- Fixed an issue in Wowza Streaming Engine 4.9.2 where ingesting SRT streams could cause a thread leak, resulting in continuously increasing JVM thread counts.
- Fixed an issue where VOD captions specified with the wowzacaptionfile query parameter were not processed when the filename contained multiple dots.
- Fixed an issue where unidentified sessions were repeatedly closed without being removed from the session map, causing excessive logging and unnecessary server load.
- Fixed an issue related to Wowza CDN stream targets where network-related problems could cause excessive HTTP connections to remain open and lead to resource exhaustion.
- Fixed an issue with Wowza Streaming Engine license validation affecting the activation of specific non-production and trial license keys.
- Fixed an issue on ARM systems where the updater could cause H.265/HEVC transcoding to fail.
Regards,
Jason Hilton
Senior Technical Support Engineer
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