Score:2

Ubuntu

Converting MKV to MP4 Using FFMPEG

playl01

2/22/23, 9:14 AM

I'm using the following line to convert

for f in *.mkv; do ffmpeg -i "$f" -c:v copy -c:a aac -b:a 256k "${f%%mkv}mp4";&& rm "{$f}.mkv"; done

i need this to also check sub directories but i keep getting token error or bash error

also it doesn't delete the mkv files when finished converting

once i have the line working correctly how would i then go one step further and make it auto run say once a day to convert any newly added mkv files.

528

0 + 0

xubuntu

bash

scripts

ffmpeg

Score:7

Ubuntu

muru

2/22/23, 9:33 AM

ffmpeg -i "$f" -c:v copy -c:a aac -b:a 256k "${f%%mkv}mp4";&& rm "{$f}.mkv"; is a syntax error - you cannot have a && after a ;. It should just be ffmpeg -i "$f" -c:v copy -c:a aac -b:a 256k "${f%%mkv}mp4" && rm "{$f}.mkv";. Then, your $f already ends in .mkv, so the rm command should be just rm "$f".

To recurse into subdirectories, use globstar:

shopt -s  globstar
for f in **/*.mkv; do ... done

All told:

#! /bin/bash
shopt -s  globstar
for f in **/*.mkv
do
  ffmpeg -i "$f" -c:v copy -c:a aac -b:a 256k "${f%%mkv}mp4" &&
    rm "$f"
done

To run it on a schedule, see Running a script everyday using a cronjob or How do I properly install a systemd timer and service?.

0 + 0

playl01

2/22/23, 6:18 PM

Hi thank you for the answer I’ve been pulling my hair out so if I want it to run say all sun directories or /storage2/ do I just add that instead of the ** in front of mkv

playl01

2/22/23, 6:35 PM

So basically all the sub directories under storage2/Series. Have mkv files in

playl01

2/23/23, 11:30 PM

When I run this it says no mkv file found, it’s not searching sub directory

muru

2/24/23, 3:20 PM

@playl01 What exactly did you run? If you want to use it in `/storage2`, either `cd` there before running this, or replace `**/*.mkv` with `/storage2/**/*.mkv`.

playl01

2/24/23, 9:35 PM

**/*.mkv no suck file directory so the mkv are all in sub directories of storage2

playl01

2/25/23, 9:09 AM

Hi so within series./ we have sub folders 2 deep when I run the above script it is saying no such file or directy

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Converting MKV to MP4 Using FFMPEG

TH: การแปลง MKV เป็น MP4 โดยใช้ FFMPEG

RO: Conversia MKV în MP4 utilizând FFMPEG

RU: Преобразование MKV в MP4 с помощью FFMPEG

VI: Chuyển đổi MKV sang MP4 bằng FFMPEG

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