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Sat, 27 Dec 2025 04:56:24 -0800 (PST) MIME-Version: 1.0 Date: Sat, 27 Dec 2025 18:26:13 +0530 X-Gm-Features: AQt7F2pP2LXEUIply_m2dqYA_-AsoRVCo3-7jKw9iI00PPh3JVKuMGM-9rZISBM Message-ID: To: ffmpeg-devel@ffmpeg.org Message-ID-Hash: RIJAU6TTF6BMMQDDUQEWANM5HR3AXYVD X-Message-ID-Hash: RIJAU6TTF6BMMQDDUQEWANM5HR3AXYVD X-MailFrom: SRS0=PhJm=7B=gmail.com=sheikh15520011@ffmpeg.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; header-match-ffmpeg-devel.ffmpeg.org-0; header-match-ffmpeg-devel.ffmpeg.org-1; header-match-ffmpeg-devel.ffmpeg.org-2; header-match-ffmpeg-devel.ffmpeg.org-3; emergency; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Content-Filtered-By: Mailman/MimeDel 3.3.10 X-Mailman-Version: 3.3.10 Precedence: list Reply-To: FFmpeg development discussions and patches Subject: [FFmpeg-devel] NVENC regression in newer FFmpeg builds; CPU encoding works correctly and fixes MPEG artifacts List-Id: FFmpeg development discussions and patches Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: Sheikh Afnan via ffmpeg-devel Cc: Sheikh Afnan Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Archived-At: List-Archive: List-Post: Hello FFmpeg Team, I would like to report observations comparing older FFmpeg builds with newer releases (latest from gyan), specifically regarding NVENC support and MPEG handling. Behavior with older FFmpeg builds: - NVENC (h264_nvenc) works correctly on NVIDIA GTX 1660 Super and RTX 3050 systems. - Using explicit colorspace and range settings (BT.709, limited/TV range) produces correct colors. - However, when processing MPG/MPEG files, visible horizontal line artifacts (interlacing/combing on faces) appear, even though these artifacts are not present in the original source files. Behavior with newer FFmpeg builds (latest gyan): - CPU-based encoding (libx264, CRF 25) produces correct output: - Colors appear correct without forcing colorspace parameters. - MPG/MPEG files no longer show the face-line/interlacing artifacts seen in older builds. - NVENC, however, does not function correctly: - NVENC is unavailable or fails to initialize on systems where it previously worked. - This affects both NVIDIA GTX 1660 Super (driver 12.4) and RTX 3050 systems (driver 12.x). - As a result, applications are forced to use CPU encoding in newer builds. In summary: - Newer FFmpeg builds improve CPU-side decoding and MPEG handling. - NVENC support that worked reliably in older builds appears to regress or become incompatible in newer builds for the same hardware and driver environments. I would appreciate clarification on: - Whether there have been intentional changes or increased requirements for NVENC initialization in FFmpeg 6.x. - Any recommended steps to restore NVENC functionality on supported GTX and RTX GPUs. - Whether this NVENC behavior is expected or considered a regression compared to older builds. Thank you for your continued work on FFmpeg. Any guidance would be greatly appreciated. Best regards, Sheikh Afnan _______________________________________________ ffmpeg-devel mailing list -- ffmpeg-devel@ffmpeg.org To unsubscribe send an email to ffmpeg-devel-leave@ffmpeg.org