[SOLVED] FFMPEG appears to be trashing bash script variables

Hi,
I have a directory containg MP4 files which were downloaded via youtube-dl upon which I want to extract audio using FFMPEG.
I am using the usual find/while/read/do/done loop to process each file individually. The files were downloaded using Youtube-dl (invoked with --restrict-filenames) so the youtube video ID is recorded within the filename which can then be used to obtain the video title (ie to tag the audio with once extracted, ie ID3).
Without FFMPEG the loop works as expected as can be seen when using echo, but as soon as I introduce FFMPEG into the loop, no such file or directory errors are reported because the filenames passed to FFMPEG are nonsense and appear to have been trashed, for instance, characters are stripped from the start or end of the filename.
find . -name '*.mp4' | while read FILE
do
FNAME=${FILE%.mp4}
FID=${FNAME: -11}
FTITLE=${FNAME%-$FID}
TITLE=$(youtube-dl --get-title $FID)
# MP3="${FNAME}.mp3"
AAC="${FNAME}.aac"
ffmpeg -i $FILE -vn -acodec copy $AAC
done
Frequently green text like so reams down the terminal:
stream #1:
keyframe=1
duration=0.023
dts=355.033 pts=355.033
size=252
Swiftly followed by:
00000000 21 0a 4f ff ff e0 3f fe a2 c6 b1 41 31 a0 88 41 !.O...?....A1..A
00000010 28 3e 00 03 d2 15 25 4a 92 17 40 0b e4 f5 4c e5 (>....%[email protected].
00000020 af 56 45 aa 31 0c eb 87 45 ac 26 54 8a ed c9 b4 .VE.1...E.&T....
00000030 94 98 ca a8 03 34 aa bf 04 51 38 12 c9 43 80 62 .....4...Q8..C.b
00000040 5b 16 94 99 20 18 9e cd 55 d0 6c 15 38 13 ce cc [... ...U.l.8...
00000050 d4 2e 80 3b 10 e9 07 70 bc 23 8c 8c 84 96 8a 38 ...;...p.#.....8
00000060 29 63 8d 87 75 5e 66 dc fa de 7f 4e 70 b2 44 09 )c..u^f....Np.D.
00000070 39 c7 30 50 78 2b 6a b0 48 90 ba c4 14 c4 41 5c 9.0Px+j.H.....A\
00000080 b6 3c 64 38 4d 92 3a b6 d1 01 d3 99 86 d5 54 23 .<d8M.:.......T#
00000090 2a c4 13 49 61 50 b7 d0 3c 1e 2b 4b 90 c4 32 ae *..IaP..<.+K..2.
000000a0 bc 6b 57 a6 de df 19 53 8e 38 66 d1 c4 fc a4 d5 .kW....S.8f.....
000000b0 f9 6f a9 2d 20 6c eb 29 1e 1a ef 96 a6 84 82 63 .o.- l.).......c
000000c0 0a cc 75 82 14 b4 08 09 fa 11 b8 0d e7 11 80 84 ..u.............
000000d0 20 31 18 00 05 2a 54 af 46 ac 08 79 b9 a8 11 70 1...*T.F..y...p
000000e0 f5 c0 2f 88 4b 27 7c a4 fd f9 f1 e4 77 53 c5 4a ../.K'|.....wS.J
000000f0 d7 74 d1 02 80 46 40 08 16 a1 e7 .t...F@....
It doesn't matter if the filenames originate from find or redirected from the contents of a text file. Anyone have any suggestions for workarounds?
Last edited by jwm-art (2014-05-27 21:39:39)

Self contained example:
#!/bin/bash
while read URL
do
echo -n "Downloading video from ${URL}... "
youtube-dl --restrict-filenames "${URL}" --quiet
if test $? -eq 0; then
echo "Ok"
else
echo "FAIL"
echo "Aborting..."
exit
fi
done <<YT_URLS
https://www.youtube.com/watch?v=XqdYnxv01yM
https://www.youtube.com/watch?v=lX_o5t2YoUE
https://www.youtube.com/watch?v=V9sI6VEDE5M
YT_URLS
find . -name '*.mp4' | while read -r FILE
do
echo "-----------------------------------------"
echo -n "Converting ${FILE} to MP3... "
MP3="${FILE%.mp4}.mp3"
echo "${MP3}"
ffmpeg -loglevel warning -y -i "${FILE}" "${MP3}"
if test $? -eq 0; then
echo "Ok"
else
echo "FAIL"
echo "Abortingm..."
exit
fi
echo
done
Here's the output on my system:
$ ../ffmpeg_test
Downloading video from https://www.youtube.com/watch?v=XqdYnxv01yM... Ok
Downloading video from https://www.youtube.com/watch?v=lX_o5t2YoUE... Ok
Downloading video from https://www.youtube.com/watch?v=V9sI6VEDE5M... Ok
Converting ./Rabbit_City_White_Lable_-_Beyond_Control-lX_o5t2YoUE.mp4 to MP3... ./Rabbit_City_White_Lable_-_Beyond_Control-lX_o5t2YoUE.mp3
Enter command: <target>|all <time>|-1 <command>[ <argument>]
Parse error, at least 3 arguments were expected, only 1 given in string 'osmo_Dibs_-_Xultation-V9sI6VEDE5M.mp4'
debug=1
debug=2 1984kB time=00:02:06.95 bitrate= 128.0kbits/s
error parsing debug value
debug=0
[output stream 0:0 @ 0xd90b60] EOF on sink link output stream 0:0:default.
No more output streams to write to, finishing.
[libmp3lame @ 0xc71de0] Trying to remove 815 more samples than there are in the queue
size= 6971kB time=00:07:26.12 bitrate= 128.0kbits/s
video:0kB audio:6971kB subtitle:0 data:0 global headers:0kB muxing overhead 0.004483%
19212 frames successfully decoded, 0 decoding errors
[AVIOContext @ 0xd9ff60] Statistics: 2 seeks, 17081 writeouts
[AVIOContext @ 0xc77200] Statistics: 7082450 bytes read, 176 seeks
Ok
The first MP4 file found is converted, but alongside strange unexplained output, and then it just stops. In the first iteration of the second loop how does FFMPEG get hold of the second filename (incomplete, missing first character)? What is the "Enter command" all about? Its all very weird.
Last edited by jwm-art (2014-05-27 20:17:57)

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REC_HOURS=0
MINUTES=0
REC_START=$(($START-$REC_MINS))
while [ $((${REC_START}+${REC_HOURS}+${REC_MINS})) -lt $FINISH ]; do
((REC_MINS++))
((MINUTES++))
if [ ${REC_MINS} -ge 60 ]; then
REC_MINS=0
((REC_HOURS+=100))
fi
done
if [ "$NAME" == "" ]; then
declare FILE_NAME="${SAVE_FOLDER}/TV-`date +%Y%m%d-%H%M`-ch.${CHAN}-${MINUTES}.min.mpg"
else
declare FILE_NAME="${SAVE_FOLDER}/TV-${NAME}-${MINUTES}.min.mpg"
fi
dd if=/dev/dvb/adapter${DVB_DEVICE_NUM}/dvr${DVB_DEVICE_NUM} \
of=${FILE_NAME} conv=noerror &
PIDOF_CAT=$!
if (( ${PIDOF_CAT} == 0 )); then
printf "$red\tError Starting Recording.\n\t/dev/dvb/adapter${DVB_DEVICE_NUM}/dvr${DVB_DEVICE_NUM} Unavailable\n"
kill ${PIDOF_AZAP}
remove_entry
exit 1
fi
printf "$yell\tRECORDING TO :$cyan ${FILE_NAME}\n"
sleep ${MINUTES}m
kill ${PIDOF_CAT} && wait ${PIDOF_CAT} 2> /dev/null
# pkill $ZAP_COMMAND # && wait ${PIDOF_AZAP} 2> /dev/null
kill ${PIDOF_AZAP} && wait ${PIDOF_AZAP} 2> /dev/null
printf "$yell\tFINISHED REC :$cyan ${FILE_NAME}\n$reset"
remove_entry
waiting 1
function check_action {
[ -e "$SCHED_FILE" ] || waiting $SLEEP
[ "`cat $SCHED_FILE`" == "" ] && waiting $SLEEP
DAY="0"; START="0"; FINISH="0"; CHAN="0"; NAME="0"
TODAY=`date +%Y%m%d`
NOW=`date +%k%M`
while read -r DAY START FINISH CHAN NAME; do
#printf "$DAY $START $FINISH $CHAN $NAME\n"
break
done < $SCHED_FILE
if [ $DAY == $TODAY ] && [ $START -lt $NOW ]; then
printf "$red\tOld Entry : Removing $CHAN $START\n"
remove_entry
waiting 1
fi
if [ $DAY == $TODAY ] && [ $START == $NOW ]; then
record_entry
else
waiting $SLEEP
fi
function waiting {
howlong=$1
sleep $howlong && check_action
check_action
exit 0
And the script that has been working fine 24hrs at a time
#!/bin/bash
echo alarm uses a twelve hour clock
echo Type the time for the alarm to sound as 00-00-?m
echo e.g. 05-35-pm for 5:35pm :: 05-35-am for 5:35am
read TIME
function play {
A="$(date +%I-%M-%P)"
if [ $A = $TIME ]; then
for i in {1..10}; do
$(aplay -c 1 /home/$USER/alarm/chime.wav); done
exit
else
wait
fi
function wait {
sleep 15 && play
play
I was hoping to have this script idling away in screen with rtorrent, always ready to do something if need be but that's not going to happen unless I can get a clue on what part of the script I need to change to not hit any limits. My websearches are failing me on this...
Last edited by moetunes (2012-06-24 21:41:52)

Thanks falconindy. I changed to using a while loop.
#!/bin/bash
set -o nounset
shopt -s huponexit
# User defines
declare -i DVB_DEVICE_NUM="0"
declare CHANNELS_CONF="${HOME}/Mychannels.conf"
declare SAVE_FOLDER="${HOME}/TV/tele"
declare SCHED_FILE="$HOME/.sched-tv"
declare ZAP_COMMAND="tzap"
declare -i SLEEP=15
# Program defines
declare -i DAY="0"
declare -i START="0"
declare -i FINISH="0"
declare CHAN="0"
declare NAME="0"
declare -i MINUTES="0"
declare -i REC_START="0"
declare -i REC_HOURS="0"
declare -i REC_MINS="0"
declare -i howlong=$SLEEP
declare -i PIDOF_AZAP=0
declare -i PIDOF_CAT=0
red='\033[1;31m'
green='\033[1;32m'
yell='\033[1;33m'
cyan='\033[1;36m'
white='\033[1;37m'
reset='\033[0m'
function remove_entry {
if [ "$NAME" == "" ]; then
sed "/$DAY $START $FINISH $CHAN/d" $SCHED_FILE > /tmp/dummy
else
sed "/$DAY $START $FINISH $CHAN $NAME/d" $SCHED_FILE > /tmp/dummy
fi
mv /tmp/dummy $SCHED_FILE
function record_entry {
${ZAP_COMMAND} -a ${DVB_DEVICE_NUM} -f ${DVB_DEVICE_NUM} -d ${DVB_DEVICE_NUM} \
-c $CHANNELS_CONF -r ${CHAN} >/dev/null 2>&1 &
PIDOF_AZAP=$!
if [ "$PIDOF_AZAP" == "" ]; then
printf "$red\tError starting ${ZAP_COMMAND}.\n\tFAILED: $CHAN $START\n"
remove_entry
exit 1
fi
printf "$green\tSET CHANNEL$cyan ${CHAN}\n"
REC_MINS=$((${START}%100))
REC_HOURS=0
MINUTES=0
REC_START=$(($START-$REC_MINS))
while [ $((${REC_START}+${REC_HOURS}+${REC_MINS})) -lt $FINISH ]; do
((REC_MINS++))
((MINUTES++))
if [ ${REC_MINS} -ge 60 ]; then
REC_MINS=0
((REC_HOURS+=100))
fi
done
if [ "$NAME" == "" ]; then
declare FILE_NAME="${SAVE_FOLDER}/TV-`date +%Y%m%d-%H%M`-ch.${CHAN}-${MINUTES}.min.mpg"
else
declare FILE_NAME="${SAVE_FOLDER}/TV-${NAME}-${MINUTES}.min.mpg"
fi
dd if=/dev/dvb/adapter${DVB_DEVICE_NUM}/dvr${DVB_DEVICE_NUM} \
of=${FILE_NAME} conv=noerror &
PIDOF_CAT=$!
if (( ${PIDOF_CAT} == 0 )); then
printf "$red\tError Starting Recording.\n\t/dev/dvb/adapter${DVB_DEVICE_NUM}/dvr${DVB_DEVICE_NUM} Unavailable\n"
kill ${PIDOF_AZAP}
remove_entry
exit 1
fi
printf "$yell\tRECORDING TO :$cyan ${FILE_NAME}\n"
sleep ${MINUTES}m
kill ${PIDOF_CAT} && wait ${PIDOF_CAT} 2> /dev/null
# pkill $ZAP_COMMAND # && wait ${PIDOF_AZAP} 2> /dev/null
kill ${PIDOF_AZAP} && wait ${PIDOF_AZAP} 2> /dev/null
printf "$yell\tFINISHED REC :$cyan ${FILE_NAME}\n$reset"
remove_entry
while true; do
sleep $howlong
howlong=$SLEEP
[ -e "$SCHED_FILE" ] || continue
[ "`cat $SCHED_FILE`" == "" ] && continue
TODAY=`date +%Y%m%d`
NOW=`date +%k%M`
while read -r DAY START FINISH CHAN NAME; do
#printf "$DAY $START $FINISH $CHAN $NAME\n"
break
done < $SCHED_FILE
if [ $DAY == $TODAY ] && [ $START -lt $NOW ]; then
printf "$red\tOld Entry : Removing $CHAN $START\n"
remove_entry
howlong=1
continue
fi
if [ $DAY == $TODAY ] && [ $START == $NOW ]; then
record_entry
fi
done
exit 0
I think that should be ok now.

[solved]Need help with a bash script for MOC conky artwork.

I need some help with a bash script for displaying artwork from MOC.
Music folders have a file called 'front.jpg' in them, so I need to pull the current directory from MOCP and then display the 'front.jpg' file in conky.
mocp -Q %file
gives me the current file playing, but I need the directory (perhaps some way to use only everything after the last '/'?)
A point in the right direction would be appreciated.
thanks, d
Last edited by dgz (2013-08-29 21:24:28)

Xyne wrote:
You should also quote the variables and output in double quotes to make the code robust, e.g.
filename="$(mocp -Q %file)"
dirname="${filename%/*}"
cp "$dirname"/front.jpg ~/backup/art.jpg
Without the quotes, whitespace will break the code. Even if you don't expect whitespace in any of the paths, it's still good coding practice to include the quotes imo.
thanks for the tip.
here it is, anyhow:
#!/bin/bash
filename=$(mocp -Q %file)
dirname=${filename%/*}
cp ${dirname}/front.jpg ~/backup/art.jpg
then in conky:
$alignr${execi 30 ~/bin/artc}${image ~/backup/art.jpg -s 100x100 -p -3,60}
thanks for the help.
Last edited by dgz (2013-08-29 21:26:32)

[SOLVED]bash script

I had created a bash script which ensures that each of the applications has one instance. The problem is no applications are executed during startup. Here is my script:
if [ -z "ps aux | grep wmCalClock | head -n -1" ]
then
wmCalClock -b 100 -arial -tc cyan -bc black -e xterm &
fi
if [ -z "ps aux | grep wmfire | head -n -1" ]
then
wmfire -L1 -B1 -s0 -C2 -P fireload_temp &
fi
if [ -z "ps aux | grep wmcpuload | head -n -1" ]
then
wmcpuload -lc red -a 95 &
fi
if [ -z "ps aux | grep wmmemload | head -n -1" ]
then
wmmemload -lc red -am 95 &
fi
Last edited by heyya (2009-12-25 04:19:33)

Well, obviously not, as the string "ps aux | grep wmCalClock | head -n -1" is
never empty What you probably wanted to write is
"$(ps aux | grep wmCalClock | head -n -1)"
This will put the output of the script into the string, rather than taking the
command string itselft.

[SOLVED] FFMPEG appears to be trashing bash script variables

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