Konfekt · March 13, 2021 09:31 · Mar 13, 2021 · Mar 13, 2021 · Mar 13, 2021 · May 22, 2020
diff --git a/any2webm.sh b/any2webm.sh
@@ -23,7 +23,7 @@ cpu_cores="$(getconf _NPROCESSORS_ONL)"
 # ffmpeg \
 #   -y -loglevel error \
 #   -i "$1" \
-#   -threads "$(getconf _NPROCESSORS_ONLN)" -cpu-used 1 -quality good \
+#   -threads "${cpu_cores:-1}" -cpu-used 1 -quality good \
 #   -tile-columns 2 -frame-parallel 0 -auto-alt-ref 1 -lag-in-frames 25 \
 #   -c:v libvpx-vp9 -b:v 750k -minrate 375k -maxrate 1088k -crf 33 \
 #   -c:a libopus -ac 2 -b:a 48k -vbr on -compression_level 10 -frame_duration 40 -application audio \

diff --git a/any2webm.sh b/any2webm.sh
@@ -1,5 +1,7 @@
 #!/bin/sh
 
+# convert video files into the WebM format in batches using ffmpeg (and preferrably GNU parallel)
+
 # exit on error or use of undeclared variable or pipe error:
 set -o errexit -o nounset -o pipefail
 

diff --git a/any2webm.sh b/any2webm.sh
@@ -1,6 +1,4 @@
-#!/usr/bin/env bash
-
-# convert video files into the WebM format in batches using ffmpeg (and preferrably GNU parallel) 
+#!/bin/sh
 
 # exit on error or use of undeclared variable or pipe error:
 set -o errexit -o nounset -o pipefail
@@ -17,11 +15,13 @@ set -o errexit -o nounset -o pipefail
 # and https://notepad.patheticcockroach.com/4263/a-brief-tutorial-to-encode-in-x265-and-opus-using-ffmpeg/
 
 convert() {
-# # Single pass for faster conversion:
+cpu_cores="$(getconf _NPROCESSORS_ONL)"
+# Single pass for faster conversion:
+
 # ffmpeg \
-#   -y -loglevel fatal \
+#   -y -loglevel error \
 #   -i "$1" \
-#   -threads "$cpu_cores" -cpu-used 1 -quality good \
+#   -threads "$(getconf _NPROCESSORS_ONLN)" -cpu-used 1 -quality good \
 #   -tile-columns 2 -frame-parallel 0 -auto-alt-ref 1 -lag-in-frames 25 \
 #   -c:v libvpx-vp9 -b:v 750k -minrate 375k -maxrate 1088k -crf 33 \
 #   -c:a libopus -ac 2 -b:a 48k -vbr on -compression_level 10 -frame_duration 40 -application audio \
@@ -31,10 +31,10 @@ convert() {
 # Double pass for better quality:
 echo "Started first pass processing $1 ..."
 ffmpeg \
-  -y -loglevel fatal \
+  -y -loglevel error \
   -i "$1" \
   -pass 1 -speed 4 \
-  -cpu-used 1 -quality good \
+  -threads "${cpu_cores:-1}" -cpu-used 1 -quality good \
   -tile-columns 4 -frame-parallel 0 -auto-alt-ref 1 -lag-in-frames 25 \
   -c:v libvpx-vp9 -b:v 750k -minrate 375k -maxrate 1088k -crf 33 \
   -c:a libopus -ac 2 -b:a 48k -vbr on -compression_level 10 -frame_duration 40 -application audio \
@@ -43,10 +43,10 @@ ffmpeg \
   /dev/null &&
   echo "... finished first and started second pass processing $1 ..."
 ffmpeg \
-  -y -loglevel fatal \
+  -y -loglevel error \
   -i "$1" \
   -pass 2 -speed 1 \
-  -cpu-used 1 -quality good \
+  -threads "${cpu_cores:-1}" -cpu-used 1 -quality good \
   -tile-columns 4 -frame-parallel 0 -auto-alt-ref 1 -lag-in-frames 25 \
   -c:v libvpx-vp9 -b:v 750k -minrate 375k -maxrate 1088k -crf 33 \
   -c:a libopus -ac 2 -b:a 48k -vbr on -compression_level 10 -frame_duration 40 -application audio \

diff --git a/any2webm.sh b/any2webm.sh
@@ -39,6 +39,7 @@ ffmpeg \
   -c:v libvpx-vp9 -b:v 750k -minrate 375k -maxrate 1088k -crf 33 \
   -c:a libopus -ac 2 -b:a 48k -vbr on -compression_level 10 -frame_duration 40 -application audio \
   -movflags faststart \
+  -f webm \
   /dev/null &&
   echo "... finished first and started second pass processing $1 ..."
 ffmpeg \

diff --git a/any2webm.sh b/any2webm.sh
@@ -0,0 +1,63 @@
+#!/usr/bin/env bash
+
+# convert video files into the WebM format in batches using ffmpeg (and preferrably GNU parallel) 
+
+# exit on error or use of undeclared variable or pipe error:
+set -o errexit -o nounset -o pipefail
+
+# -crf 10 : Constant Rate Factor (crf) gives video quality from 0 (lossless) to 63 (worst); default is 23.
+# -c:a/v ... = transform the audio/video data using ...
+# -b:a/v ... = audio/video bitrate is ...
+# -cpu-used : from 0 (default) to 5. Use 1 or 2 for faster but worse encoding
+# -row-mt 1 = better multi-threading supported since libvpx 1.6
+# see https://trac.ffmpeg.org/wiki/Encode/VP9
+# https://github.com/Kagami/webm.py/wiki/Notes-on-encoding-settings
+# https://blog.programster.org/VP9-encoding
+# https://developers.google.com/media/vp9/settings/vod/
+# and https://notepad.patheticcockroach.com/4263/a-brief-tutorial-to-encode-in-x265-and-opus-using-ffmpeg/
+
+convert() {
+# # Single pass for faster conversion:
+# ffmpeg \
+#   -y -loglevel fatal \
+#   -i "$1" \
+#   -threads "$cpu_cores" -cpu-used 1 -quality good \
+#   -tile-columns 2 -frame-parallel 0 -auto-alt-ref 1 -lag-in-frames 25 \
+#   -c:v libvpx-vp9 -b:v 750k -minrate 375k -maxrate 1088k -crf 33 \
+#   -c:a libopus -ac 2 -b:a 48k -vbr on -compression_level 10 -frame_duration 40 -application audio \
+#   -movflags faststart \
+#   "${1%.[^.]*}".webm
+
+# Double pass for better quality:
+echo "Started first pass processing $1 ..."
+ffmpeg \
+  -y -loglevel fatal \
+  -i "$1" \
+  -pass 1 -speed 4 \
+  -cpu-used 1 -quality good \
+  -tile-columns 4 -frame-parallel 0 -auto-alt-ref 1 -lag-in-frames 25 \
+  -c:v libvpx-vp9 -b:v 750k -minrate 375k -maxrate 1088k -crf 33 \
+  -c:a libopus -ac 2 -b:a 48k -vbr on -compression_level 10 -frame_duration 40 -application audio \
+  -movflags faststart \
+  /dev/null &&
+  echo "... finished first and started second pass processing $1 ..."
+ffmpeg \
+  -y -loglevel fatal \
+  -i "$1" \
+  -pass 2 -speed 1 \
+  -cpu-used 1 -quality good \
+  -tile-columns 4 -frame-parallel 0 -auto-alt-ref 1 -lag-in-frames 25 \
+  -c:v libvpx-vp9 -b:v 750k -minrate 375k -maxrate 1088k -crf 33 \
+  -c:a libopus -ac 2 -b:a 48k -vbr on -compression_level 10 -frame_duration 40 -application audio \
+  -movflags faststart \
+  "${1%.[^.]*}".webm &&
+  echo "... finished second and last pass processing $1."
+} && export -f convert
+
+if command -v parallel >/dev/null 2>&1; then
+    parallel convert {} ::: "$@"
+else
+  for f in "$@"; do
+    convert "$f"
+  done
+fi