Craigstreamy HEVC Smart English Subtitle Audio Conform 4K Profile¶

Generated from stock preset pack craigstreamy-hevc-smart-eng-sub-audio-conform.

Dependencies¶

E2E Verification¶

This profile is considered e2e-verified when its mapped suites pass in CI.

• Combined toolchain snapshot: Latest E2E Toolchain Report

Intent¶

This profile converts candidates into streaming-friendly HEVC outputs while preserving the smart_eng_sub + preserve subtitle policy and conforming DTS-family or PCM-family audio when needed.

What It Optimizes For¶

• practical bitrate efficiency with a consistent HEVC target
• preserve AAC and Dolby-family audio streams when already acceptable
• conform DTS-family or PCM-family audio into open-source Dolby-aligned delivery codecs when needed
• subtitle policy: smart_eng_sub + preserve
• conditional container selection: MKV when the smart_eng_sub + preserve policy selects a subtitle, fragmented MP4 otherwise

Input Envelope¶

Scenario Map¶

Runtime Behavior¶

• Scenario RES_JUST_RIGHT uses action script transcode_hevc_4k_smart_eng_sub_audio_conform_profile.sh.
• Scenario ELSE uses action script profile_guardrail_skip.sh.

Action summary from transcode_hevc_4k_smart_eng_sub_audio_conform_profile.sh:

• Default subtitle behavior is smart_eng_sub + preserve.
• Policy can be overridden by wrapper packs via:
• VFO_SUBTITLE_SELECTION_SCOPE=smart_eng_sub|all_sub_preserve
• VFO_SUBTITLE_MODE=preserve|subtitle_convert
• VFO_SUBTITLE_CONVERT_BITMAP_POLICY=fail|preserve_mkv
• Preserves AAC and Dolby-family audio streams by default.
• Conforms DTS-family and PCM-family audio streams:
• DTS or PCM mono/stereo -> AAC + loudnorm
• DTS or PCM 3.0/4.0/5.0/5.1 -> E-AC-3 when available, else AC-3, with loudnorm
• DTS or PCM > 5.1 -> 5.1 E-AC-3/AC-3 downmix, with loudnorm
• Preserved non-MP4-safe audio (for example TrueHD) forces MKV output.
• Preserves dynamic-range signaling for HDR/DV workflows by default:
• applies metadata-repair defaults when source tags are incomplete.
• If source signals Dolby Vision side data, attempts DV RPU retention/injection.
• If source is DV profile 7.x, attempts profile 8.1 conversion semantics before injection.
• preserve emits MKV whenever the resolved subtitle policy selects streams.
• subtitle_convert keeps MP4 when selected subtitles are text-convertible and
• converts them to mov_text; bitmap subtitles fail by default unless
• VFO_SUBTITLE_CONVERT_BITMAP_POLICY=preserve_mkv.
• If no subtitle is selected and preserved audio is MP4-safe, output container is
• stream-ready MP4 (fragmented MP4 with init/moov at the start, with faststart
• fallback when E-AC-3 packaging needs it).

Operator knobs from transcode_hevc_4k_smart_eng_sub_audio_conform_profile.sh:

• VFO_MAIN_SUBTITLE_INCLUDE_DEFAULT=1 # include default english subtitle when no forced track exists
• VFO_ENCODER_MODE=auto|hw|cpu
• VFO_MP4_STREAM_MODE=fmp4_faststart|fmp4|faststart
• default: fmp4_faststart
• VFO_DYNAMIC_METADATA_REPAIR=1|0
• default: 1
• VFO_DYNAMIC_RANGE_STRICT=1|0
• default: 1
• VFO_DYNAMIC_RANGE_REPORT=1|0
• default: 1
• VFO_DV_REQUIRE_DOVI=1|0
• default: 1
• VFO_DV_CONVERT_P7_TO_81=1|0
• default: 1
• VFO_DV_P7_TO_81_MODE=2|5
• default: 2
• VFO_DV_REQUIRE_P7_TO_81=1|0
• default: 1
• VFO_DV_P7_EXTRACT_MODE=auto|mkvextract|ffmpeg
• default: auto
• VFO_AUDIO_CONFORM_TARGET_I=-14
• VFO_AUDIO_CONFORM_TARGET_TP=-1.5
• VFO_AUDIO_CONFORM_TARGET_LRA=11
• VFO_QUALITY_MODE=standard|aggressive_vmaf
• default: standard
• VFO_QUALITY_VMAF_MIN=94
• VFO_QUALITY_VMAF_MAX_PASSES=4

Starting Inputs And Expected Outputs¶

Flow¶

What This Profile Does Not Do¶

• It does not normalize frame rate; source cadence/timebase is preserved by default.
• It does not invent Atmos or proprietary immersive metadata.
• It does not transcode already-acceptable AAC or Dolby-family audio just to make everything uniform.
• It does not apply a broad audio bitrate-lowering strategy yet.
• It does not semantically understand subtitle meaning; subtitle selection is metadata and flag driven.
• It does not OCR or convert bitmap subtitles to text subtitles.
• It does not generate ABR ladders (HLS/DASH); output is a single-file artifact.
• It does not certify playback on every device model; profile criteria are compatibility-oriented guardrails.
• It does not enforce PSNR/SSIM/VMAF thresholds unless quality checks are explicitly enabled and configured.
• It does not invent missing HDR/DV essence; metadata repair is heuristic and can be disabled.
• It depends on source integrity and toolchain support for DV/HDR retention; strict mode may fail instead of silently downgrading.

High-Level Assessments¶

Source¶

• Preset file: services/vfo/presets/craigstreamy-hevc-smart-eng-sub-audio-conform/vfo_config.preset.conf
• Generated by: infra/scripts/generate-profile-docs.sh