Add shell function for fixing invalid timestamps. Fix typos.

README.org

@@ -5,12 +5,13 @@ videos, and, to your clipboard, copying ffmpeg command lines for making webms.
 
 Also, some shell aliases and functions for:
 - making audioless copies of webms
-- concatenating video files that use web-compatible codecs
+- concatenating video files that use webm-compatible codecs
 - converting youtube live stream URLs into their chat window URLs and placing in clipboard
 - taking screenshots with ffmpeg
-- watching Japanese news channels
+- watching Japanese tv channels
 - toggling sideways xorg display
 - concatenating Kindle cloud reader page fragment into a single image
+- taking a mov3.co stream cache dumped video with invalid timestamps and make a copy with valid timestamps
 * Key bindings
 ** Generally used
 - ~l~: set ab-loop points; see mpv man page
@@ -86,6 +87,7 @@ mpv 'https://music.youtube.com/playlist?list=OLAK5uy_nscRtcc2KZcydiVY7q0feukzm17
 #+end_src
 You can even skip songs forwards and backwards like you can with local files using the < and > keys.
 * Research
+- [[https://trac.ffmpeg.org/wiki/Encode/VP9][FFmpeg and VP9 Encoding Guide]]
 - [[https://superuser.com/questions/681885/how-can-i-remove-multiple-segments-from-a-video-using-ffmpeg][how to use ffmpeg's trim filter]]
 - [[https://stackoverflow.com/questions/9168058/how-to-dump-a-table-to-console][how to dump a lua table to console]]
 - [[https://github.com/mpv-player/mpv/blob/master/player/lua/assdraw.lua][mpv's assdraw module]]

tv_aliases.sh

@@ -39,7 +39,6 @@ rma() {
     local N=$( basename $1 | sed -e 's/.webm$//' -e 's/.mkv$//' -e "s/$/${FPS}/").webm
     ffmpeg -an -i $1 -c copy $FPSOPT /tmp/$N
 }
-
 # Converts youtube stream url into the chat-only url
 ytchat() {
     local URL
@@ -52,7 +51,6 @@ ytchat() {
     xclip -se c <<<"$URL"
     echo $URL
 }
-
 # concats 2 or more webms specified in /tmp/a
 #
 # learned from this
@@ -81,7 +79,6 @@ concatvid() {
     
     rm -f concatvidlist
 }
-
 # Mostly used to concatenate together the 4 pieces of a 2 page spread, or 2 pieces of a
 # single page, from kindle book fragment jpegs saved from the web inspector's "Application"
 # tab.
@@ -102,7 +99,6 @@ concatpics() {
     fi
     sxiv ${OUTPUT}.*
 }
-
 # Toggle rotation of the desktop between sideways and upright.
 togglevertical() {
     # select the first connected monitor's status line
@@ -117,3 +113,14 @@ togglevertical() {
 	xrandr --output $SCREENNAME --rotate normal
     fi
 }
+# Fix broken timestamps on cache dumps from streams with invalid timestamps
+# https://www.reddit.com/r/ffmpeg/comments/quq4kf/recreation_of_timestamps_without_reencoding/?rdt=61001
+fixtimestamps () {
+    local BASE=$(basename $1 .mkv)
+    local INTERV="/tmp/${BASE}.h264"
+    local INTERA="/tmp/${BASE}.aac"
+    # works without the make non negative options, but the first frame might have a negative timestamp, see link
+    ffmpeg -y -hide_banner -i file:$1 -c:v copy -f h264 $INTERV -c:a copy $INTERA &&
+	ffmpeg -y -hide_banner -r 25 -i $INTERV -i $INTERA -c copy -avoid_negative_ts make_zero /tmp/${BASE}.mp4
+    rm $INTERV $INTERA
+}