Παρασκευή 25 Νοεμβρίου 2022

Joining /concatenating mp3 – and other- files


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This is soem4thing that I doa lot this period for a weekly program I so with a  buy from USA.

Let me be more practical and get immediately  into the useful information :


I two programs   form the far past he one is mP3 surgeon primarily used for trimming and cutting mp3 files ‘as a surgeon’ directly into the chunks instead of decompressing and recompressing the files  that mans without any loss in audio quality. The  program however has been stopped  updating a lot ago ie around 2005 A few more utilities inside it mainly the joiner a mp3 into wav converter a batch , an mp3 catalog  and a ID3 batch. A simple but professional program that requires 30Eu after the trial


The other program is nearly the same but much simpler : mp3trackmaker that  cuts  a long mp3 based in winamp’s relative positions in between songs with a separate tab for joining files. Is was a commercial program for very long time but more recently the developer offered it for free (as Irfanview older times ) 

Do you remember this program? Winano was a breakthrough audio fileplayer of the early times of mp3 period. This program reads the position df winamp and defines points where the file can be cut.  


Both do the job very well but recently someone shown an old technique  on how to use a DOS command to join files

Tis is something very simple

copy /b first-mp3-file.mp3 + second-mp3-file.mp3 merge.mp3

where first-mp3-file.mp3 and second-mp3-file.mp3 are the filnames with merge.mp3   the resulted file name


This can be easy to be made providing that you will join a few files What you can then? The bet way is to use one of the above programs Both programs can help you define the sequence of these files. Otherwise  just dong the

Copy/b *.mp3 result.mp3  can copy the files in ‘random’

This is not exactly random as someone can think but there is a logic behind it: DOS system and Fat recognize the file position  as added in the directory: first  added first shown . The logic continues this way until a file is removed . The next added file will positioned in the vacant seat

As I noticed in his page

The unsorted files are made the way they are added in the directory Newer files are put into the bottom of the file directory If a file is deleted from this directory If you add a new file , it can be registered in the deleted files position I know that after experimenting a lot a few years ago. This also happens with your MP3 listing



Something important with file concatenation:  

AS he poster ithe above page inisisted he could use the same technique with other file formats

For this reason I uses a very good audio converter and experimented sometime with various other formats with these results as below:  

-FLAC AC3 play OK !

The resulted file is shown in the windows player  with full length and both files are played


-OGG, AAC   M4a , m4b , mp4 , wma v9 and wma10: Only the first file is played.  

The poster also claims that he cold join  .DOC and excel files . This is a big mistake . h ecan do that as far as the files are only text . However  both todays’s DOC and XLS files are binary and compressed . I did that and understood that only the first if thse files can be shown!


To advise again if the files :

-have different bit rates they are played well
-If the first file is mono only and the second is stereo , the result will be mono only
-If the fist file is 44 kHZ and the second is 48000 only the first file will be heard. The remain flies will seem as VACANT!



Δευτέρα 14 Νοεμβρίου 2022

Merging mp3 files and progblems found

This is a PC based question  (with solution found after very time consuming persistence  )

I m doing a music mix for a radio program by joining music/songs and very short song identification

The structure of this misx is made this way (I think very typical ) 

XX-  title identification
XX-  song
That iterates as far as necessary for the 30 or 50 minute program

I use two programs mainly MP Surgeon and Mp Trackmaker for joining the produced files and Total recorder for recording my voice  via various head- and ear-phones but… 

…If the files have different sampling rates (44 vs 48kHz ) only the first file can be heard . for example the song ID is heard but not the song that follows. The program continues to play without anything can be heard!  

Example: that happened before knowing the problem of the wrong sampling rates. Most music mp3 files were set  at 48kHz while my voice recorders were set  by default on 44 kHZ . The joining result was totally disappointed and littered to the bin of my laptop . I found this mismatch after analyzing the files with my Xrecode converter 


….If the files have different bit  rates the result is OK and plays well . Sometimes the standard players (as Windows player ) can show the first file’s time length even if the series of songs is smoothly played. Thie same can happen in putlockers  

For example the last days  I have joined two songs for a total length of 8.45 minutes . The Windows player shown only the 4.45 minutes ie the length of the first song but after the song was finished it continued to play with the second song showing the real time,  


…special notice. Because this program is aired via AM mode ie in mediumwave or shortwave getting lower in terms of bit rates does not show any significant differences in the final reception. Signal fading also affects  badly in that as any interference and noise into the  reception result

…the last and difficult problem was with pulockers as box and Dropbox  and happens with the bitrate  anomalies. A few resulted files  were partially downloadable after uploaded to Box or Dropbox. The problem lies into an abrupt stopping of lockers  player. Anymore tries stopped in exact the same time point

An example: My #23 file was uploaded smoothly . Both started played that OK from the start until the 19.20 minute out of the requested 27.50 length. That happened  many times again. Downloading the  file in recipients computer  resulted  in abrupt stop in nearly the same time point.  

The best solution was to zip the file so that the producer can download it in full and play in his computer . There is still some unnecessary time for him to unzip and use it. As a 35 yr PC user  ma quit fast in  doing such things but I m unsure if the other is so fast as I …

This is the most significant problem happened. Even  with everything being OK and well heard in my computer still stops in lockers player with surely abrupt  stop of downloading …


…. Another reason to be KISS is not to use my external mp3 recorder . This process is quite time consuming: Using buttons as many times as required  to record all 3 second or less song ID files then remove the DSD card add adaptor, put into the laptop, wait till explorer starts then move the files into the PC then number them etc and move the DSD card back to the recorder It has been used well past times and buttons sometime do not respond properly

…another reason is NOT to use audacity or any other sound processing program.. I could use them only if some sound effects are necessary or cut and copy works  - mixing or editing songs are required  

For example  I did  that when mixing a original Greek song with its hindi version or when tested mixing two songs with voiceovers in between.This is surely something a bit complex but with sure results and s a sure reason to use this program !




Finally I have found the solution using a more complex but also very simple in the end solution for the mixing product.  Xrecode III has a nice option of merging audio files. I have recently used that by chance which  later have been updated a bit with the following process and can be used directly with the original files to keep the highest fidelity possible before transcoding :


(a)Set output format into Mp3 and set output settings into :

(a1)Channels set to mono so that all can be set mono
(a2)output audio with sample rate set to auto or full 48000
(a3)max sample rate  into [not used ] -quality high
(a4) dynamic range compression  yes /no

(B) Action : merge /cue with mo3 unchecked  and cue file off

All this above has been saved into a profile that memorizes everything above.  




As for the low bit rate MP3 from Fraunhofer  . I have not any other choice except using total recorder as file converter by just opening and re-saving it

A serious reason is that the only second way is to use the old dbpoweramp into 32kbit abd pay around 85 Eu for a lot of other options that seem not wall operating so well



Κυριακή 2 Οκτωβρίου 2022

Sony WH-CH510

First before reading the story please oblige yourself to send your comments below. The writer  needs to know  your opinions .This will be a serious reason to  terminate this free service  




If  you just read the model with the good reception headphone but with bad audio and after watching TV for much time I decided to go to the next step by fining a better model. My idea was to find the BT  version of the T500 (ie BT500) but I was terribly dissapp0inted as the model could not be found in the market unless ordered . I searched about 5 stores with no success . Its price is just 35 out of 50 as it was on 2021. This can be for sure the reason why it disappeared.

The next found is a Sony model  with the same price . I was however impressed with its time range at 35 hours with one charge! This is one of the reasons I bought it


So yet another full plastic model so simple, a bit more than the JBL one Even a bit smaller one ! As it can be shown with the above picture the arm is nearly the 2/3s of the JBL 


as with most headphones , the buds can be rotated. But also there is some tilt is not more than 15 degrees as it can be shown above

The next and final typical with them is the button arrangement.  Volume or next /previous song  plus the power on /off button And USB C for for charging! 

They are very comfortable. They don;t irritate my head nor my mind.this is quite the second reason i bought them 


As with remain models tested this also offers a nice female voice informing the status of the model. Messages as always use female voice In this model are noted after a short tone It also advises the status of the battery. I old prefer if hat could message as battery full only. 

Reception by distance . 

First test : distance with the Redmi 5a . good reception with minimal drops esp in the point with 2 walls in between . This is the only point that signal got some temporary drops. Outdoors there were also some point with twin walls killing the signal 

Testing with laptop : reception was worse than with the Redmi with more drops on the same points I think that its wireless transmitter has lower power 

I have used  the same song  when testing both as transmitters. same audio quality  for both with good  audio very close to JBL headphones.Second and more exhaustive check shown the Sony having a  some increase on 500-1500 Hz range (middles and lower sharp tones and lack of the very deep bases ) as checked with the above and this song  =with deep basses-  from YouTube . Link to a friend singer. 

Testing with with a TV and external transmitter : this mini gadget has been tested so far to have some trebly sound when receiving with the 81DJ headphone. at first check the transmitted didn't now couple with the headphones . I waited more than 90 seconds till the transmitter turned itself off . ON second try the transmitter still coupled slow but in shorter time! Sound quality between the wired  headphones and this are nearly the same with nearly the same frequency response as tested with the first test.

Below  is the tone test #1 as made with most earphones before using a lapel microphone by testing both JBL and Sony .

From what i understand from the screenshot this headphone has very deep basses even are not heard It was quite mysterious that all tones shown as lost in the local noise but only the near 1 Khz were audible. JBK shows a tune-in on 1 kHz while the Sony on 2kHz 



As in result: 4/5 Sony headphones are quite good with a HIFi audio curve and very comfortable !  


Some additions
The headphone has been tested  in another place in a irregular room with a fireplace in-between  with 6x6 plus 6x3 [tilted] extension . The firs two tries were good but after them i seen again the problem happened with the two other BT headphones tested before: timeouts 

Connection with the Hitachi android TV is rather quirk : every time i connect with the headphones I first must to do a new BT gear that means the bit code is possibly different

Another time the connection was reset in the middle of watching and i needed to restart 'pairing' as noted above! I cant understand what is the reason..

time testing between this and rthe inkax HP31 

  • Sony with smartphone 8 seconds
    Inkax with smartphone <1 second 
  • Sony with TV >50seconds
    Inkax with TV ard 5 sec