vob files demuxer

[sdauth]

Hello,
Do you know an easy way to demux all tracks (video, audio, subtitles) from a bunch of VOB files ?
I know it is possible using mencoder or ffmpeg but one needs to manually input the stream id, what I want is to dump the whole thing in one command.
Right now I'm using makemkv to... make a mkv from the VOB, then I demux the mkv with mkvextract (from mkvtoolnix) to get the tracks separately but there must be a quicker way.
Thanks

[fedeliallalinea]

Maybe media-video/handbrake can do it.

[sdauth]

Unless it recently changed, you can't copy the video (lossless) with handbrake, and it will produce a mp4/mkv anyway.
My current workflow :
With makemkv (cli), I load the vob files and generate a mkv :

Code: Select all

makemkvcon mkv file:MOVIE/VIDEO_TS 0 .

Then I use this nice python script : https://github.com/dropcreations/mkvextractor
and select option 1 to extract all tracks from the mkv.

It works, but I would like to do it in a single operation and avoid useless writes.

[flexibeast]

i've been nerd-sniped. i've been trying to learn ffmpeg recently, so ....

This is, obviously, very far from being a one-liner, and is clearly limited; but it's POSIX other than its use of ffmpeg(1) and ffprobe(1), and only invokes ffmpeg once.

Code: Select all

extract_streams () {
    
    V_EXT='mp4'
    A_EXT='mp3'
    FILE="${1}"

    CMD="ffmpeg -i ${FILE}"
    
    STREAMS=$(
        ffprobe "${FILE}" 2>&1 | \
            sed -n 's/^.*Stream #\([^[]*\)[^:]*: \([^:]*\):.*$/\1=\2/p; ' | \
            tr '\n' ' '
        )
    for S in $STREAMS
    do
        OUT=
        EXT=
        case "${S}" in
            *Video)
                EXT=${V_EXT}
                ;;
            *Audio)
                EXT=${A_EXT}
                ;;
        esac
        if [ -n "${EXT}" ]
        then
            I=${S}
            I=${I%%=Video}
            I=${I%%=Audio}
            N=$(echo $I | awk -F: '{ print $2 }')
            OUT="stream-${N}.${EXT}"
            CMD="${CMD} -map ${I} ${OUT}"
        fi
    done

    echo "Running: $CMD"
    ${CMD}
    
}

[flexibeast]

Oh, i meant to say, you specifically asked for the subtitles to be extracted as well, but i wasn't sure whether what ffprobe(1) reports as a 'Data' stream - as distinct from 'Video' or 'Audio' - is where the subtitles are? In any case, hopefully my function gives you a base to build on (assuming someone else doesn't provide a far more elegant solution).

[yayo]

This page suggests to use some extra options ( -analyzeduration # -probesize # ) while looking for streams in a vob file with ffmpeg (see step 2):
https://www.internalpointers.com/post/c ... mkv-ffmpeg

That's because vob files have no headers, so you must force ffmpeg to search for data streams "manually".

[Dragonix]

Hi,
ProjectX should do the job.
packages.gentoo.org
Website

[downloader]

To demux all tracks (video, audio, subtitles) from a batch of VOB files using FFmpeg, you can employ a straightforward command:

Code: Select all

ffmpeg -i input.vob -map 0 -c copy output.mkv

This command remuxes the VOB files into a Matroska (MKV) container, preserving all tracks without any transcoding. The -map 0 option selects all streams from the input file, and -c copy copies them into the output MKV file without re-encoding.

Alternatively, if you prefer to demux directly from the VOB files without creating an intermediate MKV file, you can use:

Code: Select all

ffmpeg -i input.vob -c copy -map 0:v:0 video_track.vob -map 0:a audio_track.ac3 -map 0:s subtitle_track.sub

In this command:

• -map 00 selects the first video stream.
  -map 0:a selects all audio streams.
  -map 0:s selects all subtitle streams.
  Replace input.vob with your VOB file's name and adjust the output file names (video_track.vob, audio_track.ac3, subtitle_track.sub) as needed.

These commands enable you to quickly demux all tracks from your VOB files with a single command. Let me know if you need further assistance!

[flexibeast]

@downloader: In the first post, the OP wrote:

I know it is possible using mencoder or ffmpeg but one needs to manually input the stream id

which i take as implying that the OP doesn't want to have to manually specify each of the streams and each distinct file those streams should be placed in. Hence the script i provided; whereas the second command you provided, to extract individual streams into distinct files, doesn't seem to avoid having to manually specify the stream to be extracted. Am i missing or misunderstanding either you or the OP?

[downloader]

@downloader: In the first post, the OP wrote:

I know it is possible using mencoder or ffmpeg but one needs to manually input the stream id

which i take as implying that the OP doesn't want to have to manually specify each of the streams and each distinct file those streams should be placed in. Hence the script i provided; whereas the second command you provided, to extract individual streams into distinct files, doesn't seem to avoid having to manually specify the stream to be extracted. Am i missing or misunderstanding either you or the OP?

The script you provided automates the extraction of all streams from the input file without requiring manual specification of each stream ID. On the other hand, the second command I suggested allows for the extraction of specific streams into separate files but necessitates manual input of the stream ID for each extraction. Both approaches offer solutions to the OP's query, with your script providing a more automated process and the second command allowing for more granular control over stream extraction. The choice between the two methods depends on the OP's preference regarding automation and the desired output format.