DVB-t audio format LATM became to ADTS

[asdl888]

Window 10 + vlc 3.0.3 + USB DVB-t dongle.

use this command:

"C:\Program Files\VideoLAN\VLC\vlc.exe" dvb-t:// :dvb-frequency=545000 :dvb-bandwidth=6 :program=201

I can watch DVB-t in realtime and the audio format is LATM.

then I use this command to record program:

"C:\Program Files\VideoLAN\VLC\vlc.exe" dvb-t:// :dvb-frequency=545000 :dvb-bandwidth=6 :program=201 :sout=#file{dst=test2.ts}

the recorded file's audio format become to ADTS.

I want to keep LATM format,what parameter I need ? TKS~

[asdl888]

year 2010, Vippe say:

They also use LATM here in Denmark and I had a lot of trouble with
recordings from our HD channel.

VLC can play these files as long as they are muxed in a ts or mp4
container, but I found out that if you remuxed a ts file with VLC
it would strip the LATM bit packing from the stream.

[Rémi Denis-Courmont]

Muxing as LATM is currently only for RTP, not MPEG-TS.

[InTheWings]

year 2010, Vippe say:

They also use LATM here in Denmark and I had a lot of trouble with
recordings from our HD channel.

VLC can play these files as long as they are muxed in a ts or mp4
container, but I found out that if you remuxed a ts file with VLC
it would strip the LATM bit packing from the stream.

Provide original recording, I'll try to remux to reproduce the issue

[asdl888]

Provide original recording, I'll try to remux to reproduce the issue

LATM sample
linux+vlc 3.0.3 + .xspf ,press rec button

https://drive.google.com/file/d/1E5-HxJ ... sp=sharing


ADTS sample
linux+vlc 3.0.3,use command line
vlc dvb-t:// :dvb-frequency=545000000 :dvb-bandwidth=6 :dvb-program=201 :sout=#file{dst=test3.ts}

https://drive.google.com/file/d/10bcRB0 ... sp=sharing

[Lotesdelere]

here in Denmark

:dvb-bandwidth=6

I'm not sure if it could have an effect, but are you sure about the bandwidth value ?
According to this paper it should be 8 not 6 (7 in only one case):
https://www.teracom.se/globalassets/mot ... 4-v018.pdf

[asdl888]

here in Denmark

:dvb-bandwidth=6

I'm not sure if it could have an effect, but are you sure about the bandwidth value ?
According to this paper it should be 8 not 6 (7 in only one case):
https://www.teracom.se/globalassets/mot ... 4-v018.pdf

I am living in Taiwan.(I am a Taiwanese)

Before 2004.7.1, Taiwan use NTSC analog TV system.

After 2004.7.1, Taiwan switch to DVB-T system.

So,Taiwan use 6Mhz bandwidth.


and more,
this month, Taiwan begin DVB-T 4K try broadcasting.(not DVB-T2)
if anyone interested,you can download 4k sample here:
https://electronmania.blogspot.com/2018 ... 0184k.html
(this week,you can dowload 4K SDR or 4K HLG10, next week will add 4K PQ10)

[InTheWings]

here in Denmark

:dvb-bandwidth=6

this month, Taiwan begin DVB-T 4K try broadcasting.(not DVB-T2)
if anyone interested,you can download 4k sample here:
https://electronmania.blogspot.com/2018 ... 0184k.html
(this week,you can dowload 4K SDR or 4K HLG10, next week will add 4K PQ10)

Would be better if you could do raw dumps. Those are missing the multiplex tables. That would have been useful to validate EPG

[asdl888]

Would be better if you could do raw dumps. Those are missing the multiplex tables. That would have been useful to validate EPG

This is
VLC 3.0.3 + 4k_channel.xspf , press REC button to record
https://drive.google.com/file/d/1HAZXQf ... sp=sharing
(4K PQ10 110MB)

[InTheWings]

If you really want to do a raw recording, VLC is useless. Record button will just remux.

Tune to the right frequency, ex:
dvbv5-zap -r -P -c dvb_channel.conf CHANNELNAME
dump raw stream from device:
cat /dev/dvb/adapter0/dvr0 > file.ts

[asdl888]

dvbv5-zap dump DVB-t HD h.264
https://drive.google.com/file/d/17z2pZY ... sp=sharing

dvbv5-zap dump DVB-t 4K PQ10
https://drive.google.com/file/d/1gzjZFC ... sp=sharing