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Add video stream copy remuxing

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ajp_anton
2026-07-22 22:51:00 +00:00
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@@ -139,6 +139,8 @@ After validation, interactive runs switch to an encoding review screen. The top
x265 is the default video encoder. Profile and level can each be left unset, calculated as the minimum required for every clip individually, or selected manually as a requested floor. A manual value that is too low for one clip is upgraded only for that clip. Choices shown in red do not directly support every clip in the batch. x264 is unavailable when any validated Avisynth output is above 10-bit; output above 12-bit fails validation and is excluded from encoding. For x265, tier follows the level constraint: x265 tries Main tier first and may use High tier when the selected level requires it.
When every validated script preserves the complete source video timeline and its basic video properties, the video codec list also offers `copy`. This directly remuxes the source video stream, so it does not run Avisynth video effects. Audio may independently be copied or re-encoded. If a selected MP4 container cannot stream-copy a source video or audio codec, the container row shows a red warning and the run cannot start until you choose a compatible container or re-encode that stream. Use MKV for stream-copying formats such as PCM audio that are not supported by this MP4 workflow.
The repo includes source for a small bundled Avisynth runner in `tools/avisynth_runner/`. Build it on Linux with:
```bash
@@ -167,7 +169,7 @@ Audio support currently covers validated outputs that the current encoder path s
- Normal frame deletion uses segmented AAC audio cuts so removed frame durations are removed from audio too.
- Audio copy is allowed for whole-file outputs and simple beginning/end trims. FFmpeg does input-side stream-copy trimming for that case, so the cut can be limited by packet/keyframe boundaries. Normal frame deletion and speed changes still require audio re-encoding or no audio.
- If copy is requested for a trimmed or speed-changed output, the output is video-only rather than risking bad sync.
- MKV output can use Opus or FLAC audio. MP4 output intentionally stays limited to AAC, copy, or no audio for compatibility.
- MP4 and MKV can use AAC, Opus, FLAC, copied audio, or no audio. AAC remains the most widely compatible MP4 audio choice; Opus and especially FLAC in MP4 may not play on older devices or applications.
- Optional audio edits are supported by copying the editable video `.avs` to `[visible script stem]_audio.avs` next to it. The normal generated source import already includes source audio when the video has audio, so the audio edit script can be the same script shape as the video edit script. Its video output is ignored, and its whole audio output is rendered to WAV, then trimmed by Python to match the validated video timeline.
After successful encodes, the script asks what to do with the finished files:
@@ -181,12 +183,12 @@ Non-interactive encode options:
- `MBT_VIDEO_TIMESTAMP_NAMES=1` names outputs as `YYYYMMDD_HHMMSS.mp4`; `0` keeps original-style workspace names.
- `MBT_VIDEO_TIMEZONE=+03:00` selects the timezone used for timestamp filenames. If omitted, one consistent embedded source timezone is preferred; conflicting or missing source offsets fall back to the system timezone. No timezone is needed when timestamp filenames are disabled.
- `MBT_VIDEO_CONTAINER=mp4` or `mkv` selects the output container. MP4 is the default.
- `MBT_VIDEO_CODEC=x264` or `x265` selects FFmpeg `libx264` or `libx265`; x265 is the default.
- `MBT_VIDEO_CODEC=x264`, `x265`, or `copy` selects FFmpeg `libx264`, `libx265`, or direct source-video remuxing; x265 is the default. `copy` is only available for unchanged validated video timelines.
- `MBT_VIDEO_CRF=16` sets CRF. Interactive defaults are 16 for x264 and 21 for x265.
- `MBT_VIDEO_PRESET=slow` sets the encoder preset.
- `MBT_VIDEO_PROFILE=minimum` and `MBT_VIDEO_LEVEL=minimum` calculate per-clip constraints. A named profile or level acts as a requested floor. Omit either variable to apply no constraint for it.
- `MBT_VIDEO_THREADS=auto` (the default) leaves encoder thread selection automatic. Set it to a positive integer to limit x264 threads or x265 worker pools.
- `MBT_VIDEO_AUDIO=aac`, `opus`, `flac`, `copy`, or `none` selects audio handling. Opus and FLAC require MKV.
- `MBT_VIDEO_AUDIO=aac`, `opus`, `flac`, `copy`, or `none` selects audio handling. AAC, Opus, and FLAC are valid in either supported container, subject to player compatibility.
- `MBT_VIDEO_AUDIO_BITRATE=192k` sets AAC bitrate.
- `MBT_VIDEO_AUDIO_PITCH=preserve` or `shift` selects whether speed-changed AAC audio keeps pitch or shifts pitch with playback speed. The default is `preserve`.
- `MBT_VIDEO_FINAL_ACTION=leave`, `replace`, or `backup` selects the final disposition.
@@ -212,6 +214,7 @@ Current video scenarios copy fixture videos to temporary directories before proc
- mixed normal frame deletion plus `MBT_Drop`
- `MBT_Drop(start,end)` and `MBT_DropEvery(...)` helper behavior
- MKV output with Opus audio
- MP4 video/audio stream-copy remuxing
## Requirements