New bie needs help in converting audio track of VOB

[charlieho]

Hi, I have some VOB files, each has 2 audio channels (both are AAC). Because my player want to read the bitrate of those tracks but AAC is VBR, I want to convert two AAC channels to AC3 and keep the VOB format.
What should i do? What is the most quickly way? Please Help me!!! Thanks a lot!

[Cornucopia]

Not possible.
AAC is not an allowed stream type inside a VOB. Maybe you are mistaken (or have a fake VOB). Open the file(s) in MediaInfo and paste the detailed text readout here.

Scott

[newpball]

Indeed it's not allowed, a manufacturer who would support it would risk getting a 'visit' from The Syndicate.

[Cornucopia]

There you go again. Totally sidetracking, sarcastically derogatory and ultimately unhelpful to the OP's topic.

Still waiting on the MediaInfo report...

Scott

[charlieho]

I used MediaInfo command line and here is the result:

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\lEtsgO>"E:\MediaInfo.exe" "E:\test_video.vob"
General
Unique ID : 1977426301059387370449929549016750247
03 (0x94C3D862FA7D2D2197A499302222A13F)
Complete name : E:\test_video.vob
Format : Matroska
Format version : Version 2
File size : 145 MiB
Duration : 4mn 23s
Overall bit rate : 4 626 Kbps
Encoded date : UTC 2012-08-27 15:11:34
Writing application : mkvmerge v5.5.0 ('Healer') built on A
pr 6 2012 21:43:24
Writing library : libebml v1.2.3 + libmatroska v1.3.0

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L3.2
Format settings, CABAC : Yes
Format settings, ReFrames : 3 frames
Codec ID : V_MPEG4/ISO/AVC
Duration : 4mn 23s
Bit rate mode : Constant
Nominal bit rate : 4 000 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 fps
Standard : NTSC
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.145
Language : English
Default : Yes
Forced : No
Color range : Limited

Audio #1
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : A_AAC
Duration : 4mn 23s
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Compression mode : Lossy
Title : Music
Language : Vietnamese
Default : Yes
Forced : No

Audio #2
ID : 3
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : A_AAC
Duration : 4mn 23s
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Compression mode : Lossy
Title : Karaoke
Language : Vietnamese
Default : No
Forced : No

C:\Documents and Settings\lEtsgO>

Please help me!

[manono]

It looks to me like some idiot renamed MKV to VOB. I think you can just rename it back to MKV and if you want to make a DVD playable on any DVD player, send it to AvsToDVD. Both video and audio will be reencoded and the resolution changed to 720x480. You never had a real VOB file.

Or just rename it to MKV and play it as it is. It depends on the player you have whether or not it can be played.

[newpball]

Some great news, you got something much better than an SD video VOB you got a low bitrate high definition source!

[charlieho]

Sorry, but what I want is convert the AAC channels to AC3. What should I do? Thanks!

[Cornucopia]

Rename the file to MKV, then use ffmpeg (or a GUI that relies on ffmpeg) and extract/convert.

Scott

[Cornucopia]

(duplicate post)

[charlieho]

Hi Scott,
I renamed to mkv and used some softwares to convert to vob AC3 but it was not successful! Please help me in detail! What command should I use with ffmpeg?
Now I have an mkv with 2 audio AAC channels, I want to have vob with 2 AC3 audio channels!
Thank you very much!

[hech54]

Rename the file to MKV, then use ffmpeg (or a GUI that relies on ffmpeg) and extract/convert.

Scott

There you go again throwing out answers like FFMPEG!!!!!!!! to a newbie/first time poster.

[poisondeathray]

If you look at his replies, he's using the command line for mediainfo. Just because someone is a "newbie" doesn't necessarily mean they are uncomfortable with a command prompt

ffmpeg -i "E:\test_video.vob" -map 0:0 -map 0:1 -map 0:2 -c:v copy -c:a ac3 -b:a 192k -c:a ac3 -b:a 192k output.mkv

This creates a real mkv container . You can rename it to .vob like your source file if you want (source was a mkv)

[manono]

Now I have an mkv with 2 audio AAC channels, I want to have vob with 2 AC3 audio channels!

Which will make you as big a fool as the person that made it in the first place.

Anyway, take your MKV, run it through MKVToAC3 to convert the audio to AC3, and then rename the MKV to VOB.

[charlieho]

It worked with ffmpeg. I have not tried MKVToAC3 yet but I hope it's ok.
Thank you very much!

[charlieho]

Another question please!
I used ffmpeg to convert my video but I just want to change audio tracks, my command:

ffmpeg -i /Share/Keomienxa.mkv -map 0:0 -map 0:1 -map 0:2 -c:v copy -c:a ac3 -b:a 448k -c:a ac3 -b:a 448k /Share/ok_keomienxa.vob

The result is:

ffmpeg version N-47561-g4e926fb-static http://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.9.2 (Debian 4.9.2-21)
configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --enable-libass --enable-gnutls --enable-libvidstab --enable-libsoxr --cc=gcc-4.9
libavutil 54. 27.100 / 54. 27.100
libavcodec 56. 42.101 / 56. 42.101
libavformat 56. 37.100 / 56. 37.100
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 17.100 / 5. 17.100
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.100 / 1. 2.100
libpostproc 53. 3.100 / 53. 3.100
Input #0, matroska,webm, from '/Share/Keomienxa.mkv':
Metadata:
encoder : libebml v1.2.3 + libmatroska v1.3.0
creation_time : 2012-08-27 15:11:34
Duration: 00:04:23.77, start: 0.000000, bitrate: 4626 kb/s
Stream #0:0(eng): Video: h264 (Main), yuv420p(tv), 1280x720 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc (default)
Stream #0:1(vie): Audio: aac (LC), 48000 Hz, stereo, fltp (default)
Metadata:
title : Music
Stream #0:2(vie): Audio: aac (LC), 48000 Hz, stereo, fltp
Metadata:
title : Karaoke
[svcd @ 0xbc26b60] VBV buffer size not set, using default size of 130KB
If you want the mpeg file to be compliant to some specification
Like DVD, VCD or others, make sure you set the correct buffer size
Output #0, svcd, to '/Share/ok_keomienxa.vob':
Metadata:
encoder : Lavf56.37.100
Stream #0:0(eng): Video: h264, yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 29.97 fps, 29.97 tbr, 90k tbn, 29.97 tbc (default)
Stream #0:1(vie): Audio: ac3, 48000 Hz, stereo, fltp, 448 kb/s (default)
Metadata:
title : Music
encoder : Lavc56.42.101 ac3
Stream #0:2(vie): Audio: ac3, 48000 Hz, stereo, fltp, 448 kb/s
Metadata:
title : Karaoke
encoder : Lavc56.42.101 ac3
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (aac (native) -> ac3 (native))
Stream #0:2 -> #0:2 (aac (native) -> ac3 (native))
Press [q] to stop, [?] for help
frame= 7904 fps=1995 q=-1.0 Lsize= 159326kB time=00:04:23.77 bitrate=4948.2kbits/s
video:128389kB audio:28850kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.327123%

However, VLC only play audio, no video. MediaInfo show that:

MediaInfo.exe /Share/ok_keomienxa.vob
General
Complete name : /HuyHlShare/ok_keomienxa
.vob
Format : MPEG-PS
File size : 156 MiB
Duration : 4mn 23s
Overall bit rate mode : Constant
Overall bit rate : 4 948 Kbps

Audio #1
ID : 189 (0xBD)-128 (0x80)
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Format settings, Endianness : Big
Muxing mode : DVD-Video
Duration : 4mn 23s
Bit rate mode : Constant
Bit rate : 448 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Stream size : 14.1 MiB (9%)

Audio #2
ID : 189 (0xBD)-129 (0x81)
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Format settings, Endianness : Big
Muxing mode : DVD-Video
Duration : 4mn 23s
Bit rate mode : Constant
Bit rate : 448 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Stream size : 14.1 MiB (9%)

I keep video because I have to convert a lot of files and this process must run as fast as possible.
Please help me!
Thanks a lot!

[poisondeathray]

Use MKV container instead , or transport stream . ffmpeg's mpeg-ps (vob) muxer cannot handle it . ffmpeg's vob muxer is strictly for DVD-video (SD DVD)

[charlieho]

How about m2ts? Our device only need vob or m2ts, but when I used:
ffmpeg -i /Share/Ori_karaoke/KeOMienXa.mkv -map 0:0 -map 0:1 -map 0:2 -c:v copy -c:a ac3 -b:a 448k -c:a ac3 -b:a 448k -bsf:v h264_mp4toannexb /Share/Ori_karaoke/KeOMienXa.m2ts
Two channels of audio have a same content. The original file has two different channels. Please show me why?
Thanks.

[poisondeathray]

What device ?

Is it ok on the computer? ie. Is the problem only on your device ?

Probably it cannot handle ffmpeg's transport stream muxing. You can try tsmuxer instead to re-wrap it. Or did you try just renaming the mkv to vob ?

[charlieho]

Sorry! The problem belongs to my device! Thank you very much!