direct-play-nice

A CLI utility to convert video files to Direct-Play-compatible (the single best optimization for your home video streaming server) formats.

Purpose

This tool was created to convert video files to formats that satisfy Direct Play requirements for all video files used by your video streaming server and their streaming devices (eg. Chromcast). It is intended to be added to a video-downloading service (ie. with Sonarr or Radarr) as an optimization feature and seamless to the end user (ie. Direct Play selected by default).

Features

• Converts any video file supported by FFmpeg
• Satisfies Direct Play requirements for Plex, Jellyfin, etc.
• Can be used standalone or as a Custom Script Connection with Sonarr, Radarr, etc.
• Allows for achieving Direct Play with all videos in a way seamless to the end user.
• Offers intuitive quality presets (match-source, 360p through 2160p + audio caps) so you can keep output sizes in check for fast starts on Plex and other direct-play servers.
• Targets every supported streaming device by default, or narrow the profile with --streaming-devices.

Supported Streaming Devices

Each device above exposes a model identifier (e.g. chromecast_ultra). The CLI assumes every device by default; supply --streaming-devices chromecast_ultra,chromecast_1st_gen or --streaming-devices all to override.

Usage

This program can be run standlone directly on the CLI or as a Custom Script Connection with Sonarr or Radarr.

CLI

Usage: direct_play_nice.exe [OPTIONS] <INPUT_FILE> <OUTPUT_FILE>

Arguments:
  <INPUT_FILE>   Video file to convert
  <OUTPUT_FILE>  Our output direct-play-compatible video file

Options:
  -s, --streaming-devices <STREAMING_DEVICES>
          Comma-separated device models or 'all'. When omitted or set to 'all',
          assumes all known devices.
  -c, --config-file <CONFIG_FILE>
          Path to the configuration file
      --video-quality <VIDEO_QUALITY>
          Target video quality profile (defaults to match the source)
          [default: match-source] [possible values: match-source, 360p, 480p,
          720p, 1080p, 1440p, 2160p]
      --audio-quality <AUDIO_QUALITY>
          Target audio quality profile (defaults to match the source)
          [default: match-source] [possible values: match-source, 320k, 256k,
          224k, 192k, 160k, 128k, 96k]
      --max-video-bitrate <MAX_VIDEO_BITRATE>
          Maximum video bitrate (e.g. 8M, 4800k, 5.5mbps)
      --max-audio-bitrate <MAX_AUDIO_BITRATE>
          Maximum audio bitrate (e.g. 320k, 0.2M)
      --unsupported-video-policy <POLICY>
          How to handle unsupported/extra video streams: convert|ignore|fail
          (default: ignore)
      --primary-video-stream-index <INDEX>
          Override auto selection of primary video stream (0-based)
      --primary-video-criteria <CRITERIA>
          Auto-pick criteria for primary video: resolution|bitrate|fps
          (default: resolution)
      --probe-streams
          Print detailed info for all streams in the input and exit
      --streams-filter <FILTER>
          Filter streams in probe: all|video|audio|subtitle (default: all)
      --output <FORMAT>
          Output format for probe results: text|json (default: text)
      --hw-accel <HW_ACCEL>
          Hardware acceleration: auto|none|nvenc|vaapi|qsv|videotoolbox|amf
          (default: auto)
      --probe-hw
          Print available HW devices/encoders and exit
      --probe-codecs
          Print all FFmpeg encoders/decoders and exit
      --only-video
          Probe filter: only show video codecs
      --only-hw
          Probe filter: only show hardware-capable codecs
      --probe-json
          Output probe results as JSON
  -h, --help
          Print help
  -V, --version
          Print version

Notes:

• In probe modes (--probe-hw, --probe-codecs, --probe-streams), the positional <INPUT_FILE> <OUTPUT_FILE> are not required (except --probe-streams, which requires <INPUT_FILE>).
• -s all has the same effect as omitting -s: the tool computes a direct-play profile compatible across all known devices.
• Combine --servarr-output-extension and --servarr-output-suffix to control how Sonarr/Radarr replacements are named. When run from Sonarr, the CLI defaults to creating Episode.fixed.<ext> (with the extension derived from the conversion output).
• Use --delete-source if you want the original input removed after a successful conversion (ignored during Sonarr/Radarr runs because the tool already swaps the file in place).
• The binary self-throttles: no more than two conversions run at once across all processes. Additional invocations wait until a slot is free.
• Tune concurrency via environment variables: set DIRECT_PLAY_NICE_MAX_JOBS for a global cap, or DIRECT_PLAY_NICE_JOBS_PER_GPU to control how many simultaneous encodes run on each detected GPU (default: two per NVIDIA/AMD device; NVIDIA is detected via nvidia-smi, AMD via rocm-smi on Linux or PowerShell on Windows). Machines without supported detection fall back to a single shared queue; set DIRECT_PLAY_NICE_MAX_JOBS manually if you want more parallelism on AMD or CPU-only hosts.

Device model strings for -s

• chromecast_1st_gen
• chromecast_2nd_gen
• chromecast_ultra

You can pass multiple, e.g. -s chromecast_1st_gen,chromecast_2nd_gen, or just use -s all.

Examples

Convert for all devices (same as omitting -s):

direct_play_nice -s all input.mkv out.mp4

Convert for specific devices (intersection of capabilities):

direct_play_nice -s chromecast_1st_gen,chromecast_2nd_gen input.mkv out.mp4

Probe hardware and codec availability (JSON):

direct_play_nice --probe-hw --probe-codecs --only-video --only-hw --probe-json

Probe input streams (text and JSON):

direct_play_nice --probe-streams input.mkv
direct_play_nice --probe-streams --output json input.mkv

Sonarr / Radarr

When running via Sonarr, Radarr, etc you can use this program to convert each downloaded video file to a Direct-Play-compatible format by adding it as a Custom Script Connection (Settings >> Connect >> Custom Script).

The binary now auto-detects Sonarr/Radarr custom-script invocations:

• sonarr_eventtype=Download or radarr_eventtype=Download triggers an in-place transcode of the file referenced by the corresponding $sonarr_episodefile_path / $radarr_moviefile_path environment variable.
• All other event types (e.g. Test, Grab, Rename, etc.) exit cleanly without requiring any CLI arguments.
• By default the script promotes the converted output to an .mp4 beside the original file (which is removed once the conversion completes). Override this by passing --servarr-output-extension match-input to keep the original container or any custom extension (e.g. --servarr-output-extension mkv).

Example Sonarr command:

/path/to/direct_play_nice --video-quality match-source --audio-quality match-source

Example Radarr command keeping the source container:

/path/to/direct_play_nice --servarr-output-extension match-input

Example Sonarr command that keeps all defaults (resulting in Episode.fixed.mp4 after conversion):

/path/to/direct_play_nice

Tip: Sonarr/Radarr will see the new filename on their next library scan. If you convert to .mp4, Plex/Jellyfin can immediately direct play the result.

Quality Controls

By default the CLI preserves source quality for both video and audio. To shrink files ahead of Plex / Jellyfin direct play, mix and match:

• --video-quality match-source|360p|480p|720p|1080p|1440p|2160p applies intuitive resolution caps and matching H.264 bitrate ceilings. For example, --video-quality 720p clamps to 1280×720 and ~5 Mbps, while --video-quality 2160p scales to 3840×2160 at ~35 Mbps.
• --audio-quality match-source|320k|256k|224k|192k|160k|128k|96k sets AAC bitrate ceilings to well-known streaming tiers (e.g. --audio-quality 192k for a "standard" profile).
• Familiar aliases such as --video-quality 4k, --video-quality full-hd, or --audio-quality high map onto the presets above.

Need something custom? Use --max-video-bitrate and/or --max-audio-bitrate to override the presets with any value such as 4800k, 6M, or 12.5mbps.

Building

This project relies on FFmpeg and rsmpeg and builds on Mac, Linux and Windows:

cargo install cargo-vcpkg
cargo vcpkg build
cargo build

After running cargo vcpkg build once, point VCPKG_ROOT at the shared installation so builds and CI reuse the same FFmpeg toolchain (this repo defaults to /opt/vcpkg on Unix and C:\\src\\vcpkg on Windows):

export VCPKG_ROOT=/opt/vcpkg

The repo defaults to /opt/vcpkg on Unix-like platforms and C:\\src\\vcpkg on Windows; override this environment variable if your setup differs. Our Cargo.toml pins vcpkg to commit 21012a516c9e5fa547baf212f2d937cd8d15dcb5 which includes FFmpeg 8—if you reuse an existing checkout, make sure it is checked out to that revision:

# Windows PowerShell
git -C $env:VCPKG_ROOT fetch https://github.com/cqundefine/vcpkg.git
git -C $env:VCPKG_ROOT checkout 21012a516c9e5fa547baf212f2d937cd8d15dcb5

# macOS/Linux
git -C "$VCPKG_ROOT" fetch https://github.com/cqundefine/vcpkg.git
git -C "$VCPKG_ROOT" checkout 21012a516c9e5fa547baf212f2d937cd8d15dcb5

Tests

# Builds assume `/opt/vcpkg`; override VCPKG_ROOT if you keep vcpkg elsewhere.
# export VCPKG_ROOT=/opt/vcpkg
cargo test

End‑to‑end conversion tests that synthesize media require the ffmpeg CLI and are marked #[ignore]. To run them explicitly:

VCPKG_ROOT=/opt/vcpkg cargo test -- --ignored

Optional: direnv

If you use direnv, add the following to .envrc so shells pick up the shared vcpkg install:

export VCPKG_ROOT=/opt/vcpkg
export RUST_LOG=${RUST_LOG:-WARN}

Then run direnv allow once in the repo.

Contributions / Support

If you run into any issues while using this software or want to add a feature or bug fix feel free to raise an issue.