MPG Trimmer application

The dvb-t stream is mpeg2 which is compatible with the mp3
specification. His app probably just names the stream mp3 instead of
mp2.

Yes, thanks, that's right. And that's my only (p*** poor) excuse for
misreading what TSReader reported when I first got a DVB-T card.

And the trimmer worked for me.
--
Robin

If you are considering any enhancements the following would (IMHO) make this
a lot more useful:

a) Ability to cut out a segment - i.e. ad removal
b) Ability to read a Transport stream in Topfield .REC format and demux/edit
that. (My understanding is that these are normal TS format with a header
record at the start.

Mike


"DAB sounds worse than FM" [email protected] wrote in message
...
I've written an application that tops and tails MPG files, but I've only
had it working on my machine so far, so could some people say whether it
works okay on their Windows machine please:

www.digitalradiotech.co.uk/MPGTrim.exe

If the MPG file is corrupted it won't work properly (it'll say something
like file duration = 0.0 seconds and the video bit rate will say some
stupidly high figure), but I'll sort that out in a day or two and I just
want to see whether it's working at all on other machines at the moment.
Thanks.


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info

"Mike" wrote in message
...
If you are considering any enhancements the following would (IMHO) make
this a lot more useful:

a) Ability to cut out a segment - i.e. ad removal
b) Ability to read a Transport stream in Topfield .REC format and
demux/edit that. (My understanding is that these are normal TS format with
a header record at the start.

Mike


"DAB sounds worse than FM" [email protected] wrote in message
...
I've written an application that tops and tails MPG files, but I've only
had it working on my machine so far, so could some people say whether it
works okay on their Windows machine please:

www.digitalradiotech.co.uk/MPGTrim.exe

If the MPG file is corrupted it won't work properly (it'll say something
like file duration = 0.0 seconds and the video bit rate will say some
stupidly high figure), but I'll sort that out in a day or two and I just
want to see whether it's working at all on other machines at the moment.
Thanks.


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info



You can do this already with freeware programs like ProjectX or
MPEGStreamclip - it's admirable that someone is doing development work but I
think any new mpeg editor/cutter whatever needs to have some unique features
in the market place. For instance ProjectX is the only TS demuxer that
extracts subtitles as well as audio and video - a program that improved on
ProjectX with the same functionality but an improved human interface would
be applauded and welcomed.

Robin wrote:
Forgot to say that it also demultiplexes radio recordings recorded on
PC cards from MPG to MP2 so that they can be played back on normal
media players.

My cards capture either the transport stream or an MP3 file - the
latter what I thought was the native format for radio on DVB-T. Help,
please?


Audio on DVB-T uses MP2 (both the audio for TV channels and radio stations),
so your PC card must be converting (transcoding is the technical term for
it) from MP2 to MP3, and that means it will be reducing the audio quality to
a greater or lesser extent, which depends on the MP3 bit rate you're
converting to - if you use a very high MP3 bit rate it shouldn't degrade the
quality much.


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info

Darren Wilkinson wrote:
Ian wrote:
In message , Robin
writes

Forgot to say that it also demultiplexes radio recordings recorded
on PC cards from MPG to MP2 so that they can be played back on
normal media players.

My cards capture either the transport stream or an MP3 file - the
latter what I thought was the native format for radio on DVB-T. Help,
please?

The Nebula software defaults to mp2.

The dvb-t stream is mpeg2 which is compatible with the mp3
specification.


DVB-T uses MPEG-1/2 Layer 2 (AKA MP2) for audio.


His app probably just names the stream mp3 instead of
mp2.


I've just renamed an MP2 file to MP3 and it still plays in Winamp and
foobar2000, and they identify it as using MP2 rather than MP3, but MP2 files
renamed to MP3 won't play in virtually any MP3 players or the vast majority
of car stereos with MP3 playback.


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info

Robin wrote:
The dvb-t stream is mpeg2 which is compatible with the mp3
specification. His app probably just names the stream mp3 instead of
mp2.

Yes, thanks, that's right. And that's my only (p*** poor) excuse for
misreading what TSReader reported when I first got a DVB-T card.


Do the MP3 files play on MP3 players? If they do then your card will be
converting the MP2 audio to MP3, but if they don't play then the card will
simply be renaming the file as MP3 when it's actually MP2.


And the trimmer worked for me.


Thanks for letting me know.


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info

Mike wrote:
If you are considering any enhancements the following would (IMHO)
make this a lot more useful:

a) Ability to cut out a segment - i.e. ad removal
b) Ability to read a Transport stream in Topfield .REC format and
demux/edit that. (My understanding is that these are normal TS format
with a header record at the start.


I might add the features you mention at some point, but I probably wouldn't
add them for some time, to be honest.


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info

so your PC card must be converting (transcoding is the technical term
for it) from MP2 to MP3,

Yes, thanks. And serves me right for switching software without paying
attention to what it produced (although I rarely record radio).

--
Robin

"DAB sounds worse than FM" [email protected] wrote in message
...
Mike wrote:
If you are considering any enhancements the following would (IMHO)
make this a lot more useful:

a) Ability to cut out a segment - i.e. ad removal
b) Ability to read a Transport stream in Topfield .REC format and
demux/edit that. (My understanding is that these are normal TS format
with a header record at the start.


I might add the features you mention at some point, but I probably
wouldn't add them for some time, to be honest.


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info


A real application killer would be a TS trimmer/ editor that allowed in-sync
cutting out of commercials and maintaining sync of subtitles. The only
program to do this at the moment is ProjectX and it's human interface is not
really all that good. Even better would be a program like Womble that
allowed the subtitle track to be laid in along with the video and audio as a
graphical representation of the words (in the subtitle track) so that you
could edit the sound, vision and subtitles in one hit or manipulate any of
the components. like sliding the subs in anticipation or delaying them as
one could do with the audio. Quite often the audio is allowed to lead the
visual cut in many films etc...

Stuart wrote:
"DAB sounds worse than FM" [email protected] wrote in message
...
Mike wrote:
If you are considering any enhancements the following would (IMHO)
make this a lot more useful:

a) Ability to cut out a segment - i.e. ad removal
b) Ability to read a Transport stream in Topfield .REC format and
demux/edit that. (My understanding is that these are normal TS
format with a header record at the start.


I might add the features you mention at some point, but I probably
wouldn't add them for some time, to be honest.


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info


A real application killer would be a TS trimmer/ editor that allowed
in-sync cutting out of commercials and maintaining sync of subtitles.
The only program to do this at the moment is ProjectX and it's human
interface is not really all that good. Even better would be a program
like Womble that allowed the subtitle track to be laid in along with
the video and audio as a graphical representation of the words (in
the subtitle track) so that you could edit the sound, vision and
subtitles in one hit or manipulate any of the components. like
sliding the subs in anticipation or delaying them as one could do
with the audio. Quite often the audio is allowed to lead the visual
cut in many films etc...


I might add TS and ad removal support in future, but as I say, it probably
wouldn't be for some time. I only wrote this and another application to
learn how to program Visual C++, and I thought I might as well write a
useful application while I'm at it, but I never intended it to be anything
more than a no-frills trimmer which maintains AV sync.


--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info