Author Topic: No sound in .ts HEVC record  (Read 495 times)

frkotou

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No sound in .ts HEVC record
« on: June 20, 2018, 07:38:29 PM »
Hi,

I have problem with audio in .ts HEVC/H265 record from DVB-T2 TV Channel. In VLC I see 2 audio channels (1 original, 1 silent audio description), but in Avidemux is only 1 audio channel (probably silent audio description). I have latest version of Avidemux.


=====================================================
Video
=====================================================
Codec 4CC:      H265
Image Size:      960 x 540
Aspect Ratio:      1:1 (1:1)
Frame Rate:      50.000 frames/s
Total Duration:      00:08:59.740

=====================================================
Extra Video Properties
=====================================================
ExtraDataSize:      00

=====================================================
Audio
=====================================================
Codec:         AAC
Channels:      Mono
Bitrate:      16000 Bps / 128 kbps
Frequency:      48000 Hz
Total Duration:      00:08:59.388
« Last Edit: June 20, 2018, 07:50:05 PM by frkotou »

eumagga0x2a

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Re: No sound in .ts HEVC record
« Reply #1 on: June 20, 2018, 09:29:45 PM »
Please provide a sample.

Jan Gruuthuse

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Re: No sound in .ts HEVC record
« Reply #2 on: June 21, 2018, 05:40:58 AM »
You did use the Avidemux Menu (Top): Audio: Select Track:
In the 'Audio Tracks Configuration' window you can see up to 4 tracks. The [V] enabled are found tracks.
Let us know
« Last Edit: June 21, 2018, 08:59:59 AM by Jan Gruuthuse »

frkotou

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Re: No sound in .ts HEVC record
« Reply #3 on: June 21, 2018, 02:27:53 PM »
In audio track list is only one track. Sample: https://drive.google.com/file/d/1obAPUyCQP1Q0suLvpVrRR4EMY9pAAjRu/view

Jan Gruuthuse

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Re: No sound in .ts HEVC record
« Reply #4 on: June 21, 2018, 02:58:47 PM »
1.9 GB is not a sample ;)
Can you record 10 seconds up to one minute max from the DVB-T2 TV Channel?
Most likely this happens just before the switch to main event event. Like cut from (commercial) break. dvb-t(2) can switch in stream from stereo, ... to ac3,... (now guessing this could be going on) thats why sample needed of this.

Jan Gruuthuse

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Re: No sound in .ts HEVC record
« Reply #5 on: June 21, 2018, 03:16:43 PM »
Yes confirmed. Plenty of extra data in that stream. Avidemux does not recognize the 2nd audio track.
ffprobe and MediaInfo info text below:

frkotou

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Re: No sound in .ts HEVC record
« Reply #6 on: June 21, 2018, 03:24:21 PM »
I'm sorry, I could not make it any shorter now. So you do not need it anymore? Will Avidemux ever be able to work with these audio tracks?

Jan Gruuthuse

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Re: No sound in .ts HEVC record
« Reply #7 on: June 21, 2018, 03:36:24 PM »
Most likely yes, if the developers recognize the issue and time permitting.

Temporary workaround.
- Remux with mkvtoolnix, 2 audio tracks are now accessible. (https://mkvtoolnix.download/)
- Drag and drop onto Audacity, both audio tracks are there. (https://www.audacityteam.org/)
select the one with 2 audio channels

« Last Edit: June 21, 2018, 03:42:35 PM by Jan Gruuthuse »

frkotou

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Re: No sound in .ts HEVC record
« Reply #8 on: June 21, 2018, 03:40:16 PM »
Ok, thank you so much. :)

Jan Gruuthuse

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Re: No sound in .ts HEVC record
« Reply #9 on: June 21, 2018, 03:43:12 PM »
Audacity has problems to, with the audio: 15 minutes is silent
mkvtoolnix only working solution. for now
« Last Edit: June 21, 2018, 04:16:36 PM by Jan Gruuthuse »

Jan Gruuthuse

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Re: No sound in .ts HEVC record
« Reply #10 on: June 21, 2018, 03:58:44 PM »
Prepared a 300 MB block copy to upload, will follow shortly
Code: [Select]
dd if=000.ts of=sample_for_avidemux000.ts bs=300M count=1

Jan Gruuthuse

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Re: No sound in .ts HEVC record
« Reply #11 on: June 21, 2018, 04:15:21 PM »
For developers to test:
1 file: sample_for_avidemux000.ts 300 MB in total ・ Will be deleted on 28 June, 2018
Download link: https://we.tl/1257OsT0jn

test cz dual audio track

frkotou

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Re: No sound in .ts HEVC record
« Reply #12 on: June 21, 2018, 04:24:03 PM »
(For info) I didn't use Audacity. I extracted the one of mka track and formatted it into AAC using FormatFactory. In Avidemux, I replaced the silent track with new extracted track and only made a video and audio shift and everything works.

eumagga0x2a

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Re: No sound in .ts HEVC record
« Reply #13 on: June 21, 2018, 08:14:59 PM »
Thank you for the sample. I don't think I'll be able to fix this (but hopefully Mean will be able to step in), Avidemux sees the PID in the PMT, but when looking for AAC extra data, it doesn't find the required marker specific to LATM streams.
« Last Edit: June 21, 2018, 08:19:58 PM by eumagga0x2a »