Adapt unmux command to changes in convert command

src/ffx/cli.py

@@ -47,6 +47,10 @@ SUBTITLE_PREFIX_OPTION_HELP = (
     "Subtitle filename prefix. Requires --subtitle-directory, or a configured "
     + "subtitlesDirectory base path that contains a matching <prefix>/ subdirectory."
 )
+UNMUX_OUTPUT_DIRECTORY_OPTION_HELP = (
+    "Write extracted streams here. When omitted together with --subtitles-only and "
+    + "--label, FFX uses the configured subtitlesDirectory base path plus the label."
+)
 CROPDETECT_SEEK_OPTION_HELP = (
     "Start crop detection this many seconds into the input. "
     + "Useful for skipping logos, intros, or black frames."
@@ -160,6 +164,27 @@ def resolveSubtitleImportOptions(context, subtitleDirectory, subtitlePrefix):
     return True, resolvedSubtitleDirectory, resolvedSubtitlePrefix
 
 
+def resolveUnmuxOutputDirectory(context, outputDirectory, subtitlesOnly, label):
+    resolvedOutputDirectory = (
+        os.path.expanduser(str(outputDirectory).strip())
+        if outputDirectory
+        else ''
+    )
+    resolvedLabel = str(label).strip()
+
+    if resolvedOutputDirectory or not subtitlesOnly or not resolvedLabel:
+        return resolvedOutputDirectory, False
+
+    configuredSubtitlesBaseDirectory = context['config'].getSubtitlesDirectoryPath()
+    if not configuredSubtitlesBaseDirectory:
+        raise click.ClickException(
+            "Subtitles-only unmux with --label requires --output-directory or a configured "
+            + "subtitlesDirectory default in ffx.json."
+        )
+
+    return os.path.join(configuredSubtitlesBaseDirectory, resolvedLabel), True
+
+
 
 @click.group()
 @click.pass_context
@@ -416,7 +441,7 @@ def getUnmuxSequence(trackDescriptor: TrackDescriptor, sourcePath, targetPrefix,
 
 @click.argument('paths', nargs=-1)
 @click.option('-l', '--label', type=str, default='', help='Label to be used as filename prefix')
-@click.option("-o", "--output-directory", type=str, default='')
+@click.option("-o", "--output-directory", type=str, default='', help=UNMUX_OUTPUT_DIRECTORY_OPTION_HELP)
 @click.option("-s", "--subtitles-only", is_flag=True, default=False)
 @click.option(
     '--nice',
@@ -454,6 +479,15 @@ def unmux(ctx,
     ctx.obj['resource_limits']['cpu_limit'] = cpu
     ctx.obj['resource_limits']['cpu_percent'] = cpu
 
+    output_directory, create_output_directory = resolveUnmuxOutputDirectory(
+        ctx.obj,
+        output_directory,
+        subtitles_only,
+        label,
+    )
+    if create_output_directory and existingSourcePaths and not ctx.obj.get('dry_run', False):
+        os.makedirs(output_directory, exist_ok=True)
+
     for sourcePath in existingSourcePaths:
 
         fp = FileProperties(ctx.obj, sourcePath)