Add audio track to TS file

[Santuzzu]

I have a ts video file with one audio track and would like to add another one without changing the video quality. I tried avidemux and mkvtoolnix but both of them are messing with bitrate and changing quality of the video. What should I try next?

[aedipuss]

with at least mkvtoolnix you are wrong. it's not an encoder and can't change the video bitrate. all it does it take what you feed it and re-wrap it in mkv.

[sekininsha]

When you are remux it does not change the quality of the video or the audio. both software can do it. ... another option TSmuxer

[Santuzzu]

Original file:

Video
ID : 2214 (0x8A6)
Menu ID : 463 (0x1CF)
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3
Format settings : CABAC / 3 Ref Frames
Format settings, CABAC : Yes
Format settings, ReFrames : 3 frames
Codec ID : 27
Duration : 1 h 46 min
Bit rate : 3 300 kb/s
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 16:9
Frame rate : 25.000 FPS
Standard : PAL
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Interlaced
Scan type, store method : Separated fields
Scan order : Top Field First
Bits/(Pixel*Frame) : 0.318
Stream size : 2.45 GiB (91%)
Color range : Limited
Color primaries : BT.601 PAL
Transfer characteristics : BT.470 System B/G
Matrix coefficients : BT.470 System B/G

After mkvtoolnix processing:

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3
Format settings : CABAC / 3 Ref Frames
Format settings, CABAC : Yes
Format settings, ReFrames : 3 frames
Codec ID : V_MPEG4/ISO/AVC
Duration : 1 h 46 min
Bit rate : 2 874 kb/s
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 50.000 FPS
Original frame rate : 25.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Interlaced
Scan type, store method : Separated fields
Scan order : Top Field First
Bits/(Pixel*Frame) : 0.139
Stream size : 2.13 GiB (96%)
Default : Yes
Forced : No
Color range : Limited
Color primaries : BT.601 PAL
Transfer characteristics : BT.470 System B/G
Matrix coefficients : BT.470 System B/G

--------------------------------------------------------------------

Perhaps I should change some settings in mkvtoolnix.

[Santuzzu]

Any idea? Perhaps this is something about interlaced videos only.

[noemi7]

Set default duration/FPS to 25i

[Santuzzu]

Same values, nothing changes.

[sekininsha]

something is wrong .. MKVtoolnix cannot do that .. it is only a remux software and it adds some characteristics (tags) .. or it is in avidemux that it is doing this .. In avidemux use the option video/audio output: 'copy' ..

[ProWo]

like sekininsha said, use TSmuxer to add an audio track to your ts file.

[Santuzzu]

Again the same story. I tried Avidemux again, tried TSmuxer, they both change the bitrate of the video. I even didn't add another audio track, just saved it as .ts file.

[poisondeathray]

Again the same story. I tried Avidemux again, tried TSmuxer, they both change the bitrate of the video. I even didn't add another audio track, just saved it as .ts file.

The actual video bitrate does not change. Mediainfo is unreliable for this. It's not really reading the bitrate, it's just "guessing" based on some parameters

If you demux both the original, and tsmuxer output, the elementary video stream will be the same size. (There might be a few bytes difference from metadata and header changes, but the decoded image will be bit for bit identical, and you can verify that with 3rd or 4th test such as PSNR, SSIM)