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Linux Audio Video

MiniDLNA

apt install minidlna

Read How-To on wiki.debian.org and thumbnails tip on reddit

Convert Audio to AC3 in Movie

Find all movies 

find . -type f -size +5M -exec exiftool {} + | egrep "File Name|AAC|Audio Channels" > aac.txt

Filter AAC movies. Convert is necessary only for movies with more channels than 2. Stereo is OK.

grep -A 1 -B 1 AAC aac.txt

Conver

ffmpeg -i video.mkv -map 0 -c:v copy -c:s copy -c:a ac3 -b:a 640k output.mkv
  • WARNING - this will convert all audio tracks to AC3 using 640kbps. I don't want this in case of more audio tracks. Check below.

ffmpeg numbering

ffmpeg numbering

ffmpeg -i Meet_the_Parents_2000_1080p_SK_CZ_ENG.mkv

Input #0, matroska,webm, from 'Meet_the_Parents_2000_1080p_SK_CZ_ENG.mkv':
Metadata:
    encoder         : libebml v1.3.0 + libmatroska v1.4.1
    creation_time   : 2018-09-29T19:31:58.000000Z
Duration: 01:47:39.77, start: 0.000000, bitrate: 3174 kb/s
    Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    Stream #0:1(slo): Audio: ac3, 48000 Hz, stereo, fltp, 224 kb/s (default)
    Metadata:
    title           : SK
    Stream #0:2(cze): Audio: ac3, 48000 Hz, stereo, fltp, 224 kb/s
    Metadata:
    title           : CZ
    Stream #0:3(eng): Audio: aac (LC), 48000 Hz, 5.1, fltp
    Metadata:
    title           : ENG
    Stream #0:4(cze): Subtitle: subrip
    Metadata:
    title           : CZ
    Stream #0:5(eng): Subtitle: subrip
    Metadata:
    title           : ENG

ffmpeg -i Meet_the_Parents_2000_1080p_SK_CZ_ENG.mkv -map 0 -c:v copy -c:s copy -c:a:0 copy -c:a:1 copy -c:a:2 ac3 -b:a:2 640k output.mkv

Copy AUDIO track 0 (a:0) which is Audio track from (global) list 0:1.
Copy AUDIO track 1 (a:1) which is Audio track from (global) list 0:2.

0:1 and 0:2 is numbering of all tracks. Global list shows audio and video tracks together. So numbers in format 0:x are all tracks (video or audio track doesn't matter).

Now, when I tell ffmpeg track is video :v or audio :a, track numbering will change and beginning always from 0 for :v or :a!

So -c:a:0 copy (audio tracks only) means copy track 0:1 without changes (just do that for tracks I don't want to change) and -c:a:2 ac3 -b:a:2 640k means convert 0:3 (for example audio eng aac) to ac3 with bitrate 640kbps.

In case movie has more tracks and I want to delete first two and convert other to AC3:

ffmpeg -i Zodiac.2007.DC.mkv -map 0 -map -0:a:0 -map -0:a:1 -c:v copy -c:s copy -c:a ac3 -b:a 640k output.mkv

SOURCE on Stack Overflow