BATCH | echo multiple variables to file

Question

Directory contains 2 (or more) video files with any random names.

video1.mkv
video2.mkv

Need to find out duration of every video. To do that we use MediaInfo.

setlocal EnableDelayedExpansion

for %%a in (*.mkv) do (
  for /f "usebackq" %%a in (`"mediainfo --Inform=Video;%%Duration%% %%a"`) do set duration=%%a

  echo "!duration!" > "data.txt"
)

Problem is, it prints only 1 value/duration (I think for last file). It works, buy only for one file.

How do I make it work with all files present in directory?

David Maseda Neira · Accepted Answer · 2017-06-10 13:29:02Z

3

just use >> instead of >, which appends instead of overriding

setlocal EnableDelayedExpansion

for %%a in (*.mkv) do (
  for /f "usebackq" %%a in (`"mediainfo --Inform=Video;%%Duration%% %%a"`) do set duration=%%a

  echo "!duration!" >> "data.txt"
)

answered Jun 10, 2017 at 13:29

David Maseda Neira

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5 Comments

user3108268 Over a year ago

It prints two values now, but they are both duplicate of one same variable value of first or last file (out of two files total).

Magoo Over a year ago

Well, perhaps it might be an idea not to try to use %%a as the metavariable in both for loops. If you were to use %%a and %%b for instance, you could echo %%a %%b>>"filename"

user3108268 Over a year ago

But %%a is a filename, I need to echo duration? I replaced second for to %%b but no change.

Magoo Over a year ago

for /f "usebackq" %%b in ("mediainfo --Inform=Video;%%Duration%% %%a") do echo %%a %%b>>"filename" %%a is the filename, %%b the duration as returned by mediainfo - so there's no need to do the intermediate assignment to duration.

phuclv Over a year ago

if you want an empty file before appending you must create the empty file first

score 1 · Accepted Answer · 2017-06-10 15:29:49Z

If mediainfo.exe is somewhere in the path this name doesn't need to be quoted, but as the .mkv file names most likely do contain spaces change the quoting like this:

@Echo off&SetLocal EnableExtensions EnableDelayedExpansion
( For %%a in (*.mkv) do (
    Set "Duration="
    For /f "delims=" %%b in (
      'mediainfo --Inform^=Video^;%%Duration%% "%%a"'
    ) do set "Duration=%%b"
    echo !Duration!,"%%a"
  )
) > "data.txt"

It isn't of much use to have the duration without knowing which file it belongs to, so this sample run with *.mpg files has the file name appended.

2595000,"R:\video\Der Traum ihres Lebens - Das Erste 2010-07-09 20-15-00.mpg"
5333160,"R:\video\Dirty Harry 3 - Der Unerbittliche - RTL2 2010-05-29 00-10-00.mpg"
5651960,"R:\video\Die Spur des Falken - Das Erste 2010-05-28 00-40-00.mpg"

Greg · Accepted Answer · 2018-12-16 16:23:32Z

0

as long as MediaInfo is in %Path% the way I have been doing this is by the use of a temp text file.

for %%a in (*.mkv) do set mkv=%%a&& call :one

goto eof

:one
mediainfo "--Inform=General;%%Duration%%" "%mkv%" >> filetemp.txt

set /p dur= < filetemp.txt

echo %dur%
pause
del filetemp.txt
:eof

I use a variation of this to encode my TV shows with ffmpeg, using MediaInfo to get the duration, framerate, and frame height, from 1-15 shows I have recorded over the week.

answered Dec 16, 2018 at 16:23

Greg

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