diff --git a/aimodel/requirements.txt b/aimodel/requirements.txt
index 8145e77..707c092 100644
--- a/aimodel/requirements.txt
+++ b/aimodel/requirements.txt
@@ -1 +1,2 @@
-tensorflow>=2.4
\ No newline at end of file
+tensorflow>=2.4
+silence_tensorflow
\ No newline at end of file
diff --git a/rainfallwrangler/src/lib/python/json2tfrecord.py b/rainfallwrangler/src/lib/python/json2tfrecord.py
index 667a98e..1c9619c 100755
--- a/rainfallwrangler/src/lib/python/json2tfrecord.py
+++ b/rainfallwrangler/src/lib/python/json2tfrecord.py
@@ -6,6 +6,9 @@ import gzip
 import json
 import argparse
 
+from silence_tensorflow import silence_tensorflow
+if not os.environ.get("NO_SILENCE"):
+	silence_tensorflow()
 import tensorflow as tf
 
 # TO PARSE:
@@ -59,7 +62,7 @@ def convert(filepath_in, filepath_out):
 			## 3: Print shape definitions (required when parsing)
 			###
 			if i == 0:
-				print("SHAPES\t"+json.dumps({ "rainfallradar": rainfall.shape.as_list(), "waterdepth": water.shape.as_list() }))
+				print("SHAPES\t"+json.dumps({ "rainfallradar": rainfall.shape.as_list(), "waterdepth": water.shape.as_list() }), flush=True)
 			
 			###
 			## 4: Serialise tensors
@@ -76,7 +79,8 @@ def convert(filepath_in, filepath_out):
 			}))
 			writer.write(record.SerializeToString())
 			
-			print(i)
+			print(f"{i}", flush=True)
+			
 
 
 def main():
diff --git a/rainfallwrangler/src/lib/python/py_jsonl2tfrecord.mjs b/rainfallwrangler/src/lib/python/py_jsonl2tfrecord.mjs
index ed310db..248a1c6 100644
--- a/rainfallwrangler/src/lib/python/py_jsonl2tfrecord.mjs
+++ b/rainfallwrangler/src/lib/python/py_jsonl2tfrecord.mjs
@@ -1,45 +1,54 @@
 "use strict";
 
 import fs from 'fs';
+import path from 'path';
 import child_process from 'child_process';
+import { Readable } from 'stream';
 
-import nexline from nexline;
+import nexline from 'nexline';
 
-import log from './NamespacedLog.mjs'; const l = log("gzipchildprocess");
-import { end_safe } from './StreamHelpers.mjs';
-import { fstat } from 'fs';
+import log from '../io/NamespacedLog.mjs'; const l = log("gzipchildprocess");
+// import { end_safe } from '../io/StreamHelpers.mjs';
 
+function snore(ms) {
+	return new Promise((resolve, _reject) => setTimeout(resolve, ms));
+}
 
 const __dirname = import.meta.url.slice(7, import.meta.url.lastIndexOf("/"));
 
 async function* py_jsonl2tfrecord(filepath_source, filepath_target, filepath_meta=null) {
-	// get stdin() { return this.child_process.stdin; }
-	// get stdout() { return this.child_process.stdout; }
-	// get stderr() { return this.child_process.stderr; }
+	// get stdin() { return this.converter.stdin; }
+	// get stdout() { return this.converter.stdout; }
+	// get stderr() { return this.converter.stderr; }
 	
+	const env = {}; Object.assign(env, process.env);
+	if(filepath_meta !== null) env["NO_SILENCE"] = "NO_SILENCE";
 	
-	child_process = child_process.spawn(
+	const converter = child_process.spawn(
 		"python3", [
 			path.join(__dirname, "json2tfrecord.py"),
 			"--input", filepath_source,
 			"--output", filepath_target
 		], { // TODO: detect binary - python3 vs python
 			// Pipe stdin + stdout; send error to the parent process
-			stdio: [ "ignore", "pipe", "inherit" ]
+			stdio: [ "ignore", "pipe", "inherit" ],
+			env
 		}
 	);
+	// converter.stdout.on("data", (chunk) => console.log(`DEBUG chunk`, chunk));
 	
-	const reader = nexline({ input: child_process.stdout });
+	const reader = nexline({ input: new Readable().wrap(converter.stdout) });
 	
 	for await(const line of reader) {
-		if(line.startsWith("SHAPE") && filepath_meta !== null ) {
-			await fs.promises.writeFile(
-				filepath_meta,
-				line.split(/\t+/)[1]
-			);
+		if(line.startsWith("SHAPES\t")) {
+			if(filepath_meta !== null) {
+				await fs.promises.writeFile(
+					filepath_meta,
+					line.split(/\t+/)[1]
+				);
+			}
 			continue;
 		}
-		
 		yield parseInt(line, 10);
 	}
 }
diff --git a/rainfallwrangler/src/lib/record/jsonl_to_tf.mjs b/rainfallwrangler/src/lib/record/jsonl_to_tf.mjs
index 2228e3f..1aedd85 100644
--- a/rainfallwrangler/src/lib/record/jsonl_to_tf.mjs
+++ b/rainfallwrangler/src/lib/record/jsonl_to_tf.mjs
@@ -2,6 +2,7 @@
 
 import fs from 'fs';
 import path from 'path';
+import os from 'os';
 import p_map from 'p-map';
 import pretty_ms from 'pretty-ms';
 
@@ -9,19 +10,28 @@ import debounce from '../async/debounce.mjs';
 import py_jsonl2tfrecord from '../python/py_jsonl2tfrecord.mjs';
 import log from '../../lib/io/NamespacedLog.mjs'; const l = log("jsonl2tf");
 
+
+/**
+ * Converts a directory of .jsonl.gz files to .tfrecord.gz files.
+ * @param	{string}	dirpath_source	The source directory to read from.
+ * @param	{string}	dirpath_target	The target directory to write to.
+ * @return	{void}
+ */
 export default async function(dirpath_source, dirpath_target) {
-	const files = fs.promises.readdir(dirpath_source);
+	const files = await fs.promises.readdir(dirpath_source);
 	
 	let time_start = new Date(), lines_processed = 0, files_complete = 0;
 	
-	const update_progress = debounce(() => {
+	const update_progress_force = () => {
 		process.stdout.write(`${files_complete}/${lines_processed} files/lines complete | ${((new Date() - time_start) / lines_processed).toFixed(3)} lines/sec | ${((files_processed / files.length)*100).toFixed(2)}% complete\r`);
-	});
+	};
+	const update_progress = debounce(update_progress_force);
 	
-	p_map(files, async (filename, i) => {
+	await p_map(files, async (filename, i) => {
 		const filepath_source = path.join(dirpath_source, filename);
-		const filepath_dest = path.join(dirpath_target, filename);
+		const filepath_dest = path.join(dirpath_target, filename.replace(/\.jsonl\.gz$/, ".tfrecord.gz"));
 		const filepath_meta = i === 0 ? path.join(dirpath_target, `metadata.json`) : null;
+		l.log(`start ${i} | ${filename} | META ${filepath_meta}`);
 		let time_start = new Date(), lines_done = 0;
 		for await (let line_number of py_jsonl2tfrecord(filepath_source, filepath_dest, filepath_meta)) {
 			lines_processed++;
@@ -30,5 +40,7 @@ export default async function(dirpath_source, dirpath_target) {
 		}
 		files_complete++;
 		l.log(`converted ${filename}: ${lines_done} lines @ ${pretty_ms((new Date() - time_start) / lines_done)}`);
-	});
+	}, { concurrency: os.cpus().length });
+	update_progress_force();
+	l.log(`complete: ${lines_processed}/${files_complete} lines/files processed in ${pretty_ms(new Date() - time_start)}`);
 }
diff --git a/rainfallwrangler/src/subcommands/jsonl2tfrecord/jsonl2tfrecord.mjs b/rainfallwrangler/src/subcommands/jsonl2tfrecord/jsonl2tfrecord.mjs
new file mode 100644
index 0000000..59f9a94
--- /dev/null
+++ b/rainfallwrangler/src/subcommands/jsonl2tfrecord/jsonl2tfrecord.mjs
@@ -0,0 +1,21 @@
+"use strict";
+
+import fs from 'fs';
+
+import settings from "../../settings.mjs";
+
+import jsonl_to_tf from '../../lib/record/jsonl_to_tf.mjs';
+
+export default async function() {
+	if(typeof settings.source !== "string")
+		throw new Error(`Error: No source directory specified (see the --source CLI argument)`);
+	if(typeof settings.target !== "string")
+		throw new Error(`Error: No target directory specified (see the --target CLI argument)`);
+	
+	if(!fs.existsSync(settings.source))
+		throw new Error(`Error: The source directory at '${settings.source}' doesn't exist or you haven't got permission to access it.`);
+	if(!fs.existsSync(settings.target))
+		await fs.promises.mkdir(settings.target);
+	
+	await jsonl_to_tf(settings.source, settings.target);
+}
diff --git a/rainfallwrangler/src/subcommands/jsonl2tfrecord/meta.mjs b/rainfallwrangler/src/subcommands/jsonl2tfrecord/meta.mjs
new file mode 100644
index 0000000..950391b
--- /dev/null
+++ b/rainfallwrangler/src/subcommands/jsonl2tfrecord/meta.mjs
@@ -0,0 +1,7 @@
+"use strict";
+
+export default function(cli) {
+	cli.subcommand("jsonl2tfrecord", "Convert a directory of .jsonl.gz files to .tfrecord.gz files.")
+		.argument("source", "Path to the source directory.", null, "string")
+		.argument("target", "Path to the target directory.", null, "string");
+}