commit 5b856b99dbd01a4ad0a83e2e9309ec4af9327875
Author: Javanaut <javanaut@maveno.de>
Date:   Sat Oct 21 09:30:51 2023 +0200

    initial

diff --git a/bin/ffx.py b/bin/ffx.py
new file mode 100755
index 0000000..2f7bd90
--- /dev/null
+++ b/bin/ffx.py
@@ -0,0 +1,155 @@
+#! /usr/bin/python3
+
+import sys, subprocess, json
+
+DEFAULT_QUALITY = 23
+DEFAULT_AV1_PRESET = 5
+DEFAULT_STEREO_BANDWIDTH = "128"
+DEFAULT_AC3_BANDWIDTH = "256"
+DEFAULT_DTS_BANDWIDTH = "320"
+
+def executeProcess(commandSequence):
+
+    process = subprocess.Popen(commandSequence, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+
+    output, error = process.communicate()
+
+    return output
+
+
+inputFilename = sys.argv[1]
+outputFilename = sys.argv[2]
+
+targetFormat = 'vp9'
+if 'av1' in sys.argv:
+    targetFormat = 'av1'
+if 'vp9' in sys.argv:
+    targetFormat = 'vp9'
+
+quality = DEFAULT_QUALITY
+qualityTokens = [q for q in sys.argv if q.startswith('q=')]
+if qualityTokens:
+  quality = int(qualityTokens[0].split('=')[1])
+
+preset = DEFAULT_AV1_PRESET
+presetTokens = [p for p in sys.argv if p.startswith('p=')]
+if presetTokens:
+  preset = int(presetTokens[0].split('=')[1])
+
+stereoBandwidth = DEFAULT_STEREO_BANDWIDTH
+stereoTokens = [s for s in sys.argv if s.startswith('a=')]
+if stereoTokens:
+   stereoBandwidth = str(stereoTokens[0].split('=')[1])
+if not stereoBandwidth.endswith('k'):
+    stereoBandwidth += "k"
+
+ac3Bandwidth = DEFAULT_AC3_BANDWIDTH
+ac3Tokens = [a for a in sys.argv if a.startswith('ac3=')]
+if ac3Tokens:
+   ac3Bandwidth = str(ac3Tokens[0].split('=')[1])
+if not ac3Bandwidth.endswith('k'):
+    ac3Bandwidth += "k"
+
+dtsBandwidth = DEFAULT_DTS_BANDWIDTH
+dtsTokens = [d for d in sys.argv if d.startswith('dts=')]
+if dtsTokens:
+  dtsBandwidth = str(dtsTokens[0].split('=')[1])
+if not dtsBandwidth.endswith('k'):
+    dtsBandwidth += "k"
+
+
+output = executeProcess(["ffprobe", "-show_streams", "-of", "json" ,inputFilename])
+
+streamData = json.loads(output)['streams']
+
+videoStreams = [s for s in streamData if s['codec_type'] == 'video']
+audioStreams = [s for s in streamData if s['codec_type'] == 'audio']
+subtitleStreams = [s for s in streamData if s['codec_type'] == 'subtitle']
+
+for aStream in audioStreams:
+    print(f"audio stream: {aStream['channel_layout']}")
+
+commandTokens = ['ffmpeg', '-y', '-i', inputFilename]
+
+
+mappingTokens = ['-map', 'v:0']
+
+for a in range(len(audioStreams)):
+    mappingTokens += ['-map', f"a:{a}"]
+
+for s in range(len(subtitleStreams)):
+    mappingTokens += ['-map', f"s:{s}"]
+
+
+audioTokens = []
+audioStreamIndex = 0
+for aStream in audioStreams:
+    channelLayout = aStream['channel_layout']
+
+    if channelLayout == '6.1':
+        audioTokens += [f"-c:a:{audioStreamIndex}",
+                        'libopus',
+                        f"-filter:a:{audioStreamIndex}",
+                        'channelmap=channel_layout=6.1',
+                        f"-b:a:{audioStreamIndex}",
+                        dtsBandwidth]
+
+    if channelLayout == '5.1(side)':
+        audioTokens += [f"-c:a:{audioStreamIndex}",
+                        'libopus',
+                        f"-filter:a:{audioStreamIndex}",
+                        "channelmap=FL-FL|FR-FR|FC-FC|LFE-LFE|SL-BL|SR-BR:5.1",
+                        f"-b:a:{audioStreamIndex}",
+                        ac3Bandwidth]
+
+    if channelLayout == 'stereo':
+        audioTokens += [f"-c:a:{audioStreamIndex}",
+                        'libopus',
+                        f"-b:a:{audioStreamIndex}",
+                        stereoBandwidth]
+
+    audioStreamIndex += 1
+
+
+
+outputTokens = ['-f', 'webm', outputFilename]
+
+nullTokens = ['-f', 'null', '/dev/null']
+
+av1Tokens = ['-c:v:0',
+                'libsvtav1',
+                '-svtav1-params',
+                f"crf={quality}:preset={preset}:tune=0:enable-overlays=1:scd=1:scm=0",
+                '-pix_fmt', 'yuv420p10le']
+
+vp9Pass1Tokens = ['-c:v:0', 'libvpx-vp9', '-row-mt', '1',
+                    '-crf', str(quality), '-pass', '1', '-speed', '4',
+                    '-frame-parallel', '0', '-g', '9999', '-aq-mode', '0']
+
+vp9Pass2Tokens = ['-c:v:0', 'libvpx-vp9', '-row-mt', '1',
+                    '-crf', str(quality), '-pass', '2',
+                    '-frame-parallel', '0', '-g', '9999', '-aq-mode', '0',
+                    '-auto-alt-ref', '1', '-lag-in-frames', '25']
+
+
+if targetFormat == 'av1':
+
+    commandSequence = commandTokens + mappingTokens + av1Tokens + audioTokens + outputTokens
+
+    print(f"Command Sequence: {commandSequence}")
+
+    executeProcess(commandSequence)
+
+if targetFormat == 'vp9':
+
+    commandSequence1 = commandTokens + vp9Pass1Tokens + audioTokens + nullTokens
+
+    print(f"Command Sequence 1: {commandSequence1}")
+
+    executeProcess(commandSequence1)
+
+    commandSequence2 = commandTokens + mappingTokens + vp9Pass2Tokens + audioTokens + outputTokens
+
+    print(f"Command Sequence 2: {commandSequence2}")
+
+    executeProcess(commandSequence2)