Script to reencode all files in a directory


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# 1  
Script to reencode all files in a directory

Hello. I usually reencode many video files with this ffmpeg command or similar

Code:
ffmpeg -y -i -c:a copy -vf scale=720:-2 -c:v mpeg4 -vtag xvid -b:v 969k -r 25 -pass 1 -an -f avi /dev/null && ffmpeg -i  -c:a libmp3lame -b:a 48k -ac 1 -vf scale=720:-2,subtitles=1.srt:force_style='Fontsize=20' -c:v mpeg4 -vtag xvid -b:v 969k -r 25 -pass 2 /.avi

So I would like to insert the parameters of this ffmpeg command on a script that reencodes all the videos on a certain directory. I tried to adapt a script that I found for it

Code:
for f in $(find -type f -name *.mkv); do ffmpeg -n -y -i "$f.mkv" -vf scale=720:-2 -c:v mpeg4 -vtag xvid -b:v 969k -r 25 -pass 1 -an -f avi /dev/null && ffmpeg -n -i "$f" -c:a libmp3lame -b:a 48k -ac 1 -vf scale=720:-2,subtitles="$f.srt":force_style='Fontsize=20' -c:v mpeg4 -vtag xvid -b:v 969k -r 25 -pass 2  ".$f.avi" ; done

However, when I try to run this script. it says that cannot find such file or directory. This happens because its treating every word separated by a blank space of the file's name as a file on its own.

So how can I solve this question. Also warns about any possible errors that might arise are welcome. Thank you
# 2  
Try using shell continuation "markers " the backslash \ Also added { }
Code:
for f in $(find . -type f -name '*.mkv'); 
do 
   ffmpeg -n -y -i "${f}" -vf scale=720:-2 -c:v mpeg4 -vtag xvid -b:v 969k \
           -r 25 -pass 1 -an -f avi /dev/null && \
   ffmpeg -n -i "${f}" -c:a libmp3lame -b:a 48k \
           -ac 1 -vf scale=720:-2,subtitles="${f}.srt":force_style='Fontsize=20' \
           -c:v mpeg4 -vtag xvid -b:v 969k -r 25 -pass 2 ".${f}.avi" ; 
done

I cannot vouch for the correctness your ffmpeg commands at all. Try it.

Last edited by jim mcnamara; 10-26-2019 at 10:17 PM..
# 3  
Yes, quote *.mkv in the find argument, and do not add another .mkv to $f!

If space characters are your problem, use
Code:
IFS=

so the for list splits on newline only.

More robust (with special characters) is a while loop
Code:
find . -type f -name "*.mkv" | while IFS= read -r f; do ... ; done

Or
Code:
while IFS= read -r f; do ... ; done < <(find . -type f -name "*.mkv")

A last possibility is find -exec:
Code:
find . -type f -name "*.mkv" -exec /bin/sh 'f=$1; ... ' sh {} \;

(Note that one must provide $0, the script name, here: sh.)
This User Gave Thanks to MadeInGermany For This Post:
# 4  
Hi MadeInGermany. I tried your script. I end receiving many messages like;

Quote:
[h264 @ 0x41456c0] nal_unit_type: 1, nal_ref_idc: 0
Clipping frame in rate conversion by 0.020821
[h264 @ 0x4162a00] nal_unit_type: 1, nal_ref_idc: 2
[h264 @ 0x4138440] nal_unit_type: 1, nal_ref_idc: 0
[h264 @ 0x41456c0] nal_unit_type: 1, nal_ref_idc: 2
[h264 @ 0x4162a00] nal_unit_type: 1, nal_ref_idc: 0
[h264 @ 0x4138440] nal_unit_type: 1, nal_ref_idc: 0
[h264 @ 0x41456c0] nal_unit_type: 1, nal_ref_idc: 2
[h264 @ 0x4162a00] nal_unit_type: 1, nal_ref_idc: 0
[h264 @ 0x4138440] nal_unit_type: 1, nal_ref_idc: 2
[h264 @ 0x41456c0] nal_unit_type: 1, nal_ref_idc: 0
[h264 @ 0x4162a00] nal_unit_type: 1, nal_ref_idc: 0
Quote:

Enter command: <target>|all <time>|-1 <command>[ <argument>]

Parse error, at least 3 arguments were expected, only 1 given in string 'T TO 2012 OLYMPICS-qK8cJH_b5fQ.mp4'
then:

Quote:
Clipping frame in rate conversion by 0.344780
[h264 @ 0x5a036c0] nal_unit_type: 1, nal_ref_idc: 2
and finally

Quote:
[h264 @ 0x4f10a00] nal_unit_type: 1, nal_ref_idc: 0
Clipping frame in rate conversion by 0.065620
[mpeg4 @ 0x4f0c2a0] P qp:236<2108.0<3658 5337 want:215699 total:218738 comp:0.240138 st_q:2108.04 size:8624 var:4332426/460252 br:969 fps:25
stream #0:
keyframe=0
duration=0.042
dts=222.722 pts=222.806
size=6954
It ends reencoding only the first video in the dir.
# 5  
Try to redirect stdin:
Code:
  </dev/null ffmpeg ...

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