Transcode No Sound unless it's copy. Can not select libfdkaac to build.

mocho

Hello I'am trying to transcode some DVB-S2 channels wich have AAC original sound codec (AAC-HE I guess). Video is working good but I have no sound unless I copy original sound. Tryed different sound codecs and none is working.

It keep me thinking it was something with the interpretation that Tvheadend makes of the AAC sound so I tryed to compile with libfdkaac support but it always show me as not selected to compile.

apt install libfdk-aac-dev aac-enc

AUTOBUILD_CONFIGURE_EXTRA=--enable-libffmpeg_static\ --enable-gpl\ --enable-nonfree\ --enable-libfdk-aac\ --enable-libfdkaac_static\ --enable-nvenc\ --enable-cardclient\ --enable-trace\ --enable-debug ./Autobuild.sh

Always Show me

...
 libvorbis                                yes
  libvorbis_static                         yes
  libfdkaac                                no
  libfdkaac_static                         no
  libopus                                  yes
  libopus_static                           yes
  nvenc                                    yes
...

I really need some help

ukn_unknown

Can you save one small sample (around 30 sec) with PASS and upload it?

mocho

ukn_unknown

Hi,
Here you have a video from my own stream with video transcode and audio PASS.

Best Regards

https://www.dropbox.com/scl/fi/6vhmh4mgxc4osmwq52lct/SIC_20240326_003022.mkv?rlkey=nuqtrwad4bpgqnjvbgl037gij&dl=0

Mr. Blond

Hi mocho,
were you ever able to fix this? I seem to be having the same issue...

mocho

Mr. Blond

No. Did you?

Mr. Blond

mocho
Sorry for the very late reply...

I have found a workaround. Nasty, but it works.

It turns out transcode sound only does not work if the source sound is AAC. Also see
tvheadend/tvheadend1663
So I changed the channel itself to already transcode using a ffmpeg command, transcoding it to mp3 using mux url:
pipe:///usr/bin/ffmpeg -loglevel fatal -i IPTVSOURCE -vcodec copy -acodec libmp3lame -b:a 128k -f mpegts -tune zerolatency pipe:1

Now the "source" audio is mp3, transcoding works with sound as well.

I use a IPTV source and therefore I can use the ffmpeg pipe command, I do not know how this should work for other inputs...

ukn_unknown

Sorry for the late response .... but was not easy.
Can you build:
uknunknown/tvheadendtree/dev_fix_aac_decode
and check if works for you?

Mr. Blond

ukn_unknown

I compiled, installed and tested this version and it works! Thanks a lot. Can you let me know once it is merged into main TVH repo?

I used this channel:
2024-08-27 12:17:52.645 mpegts: MTV 80s mux in ABC- tuning on IPTV #1
2024-08-27 12:17:52.667 subscription: 0001: "HTTP" subscribing on channel "MTV 80s", weight: 100, adapter: "IPTV #1", network: "ABC", mux: "MTV 80s mux", provider: "FFmpeg", service: "Service01", profile="TranscodeHD-600MBph", hostname="192.168.1.93", username="ukkepuk", client="TvhClient/933 LibVLC/3.0.19"
2024-08-27 12:17:52.733 transcode: 0001: 01:H264: ==> Using profile libx265-HD
2024-08-27 12:17:52.734 transcode: 0001: 02:AAC: ==> Using profile webtv-aac-HD

With my previous build:
Build: 4.3-2323-g73a6bd00d-dirty (2024-05-08T10:00:55+0000)
transcoding does not give audio.

With your build:
Build: 4.3-2358-g2b90c5e04 (2024-08-27T09:42:02+0000)
transcoding works without issues, also giving audio.

btw I am using this audio profile:

ukn_unknown

Mr. Blond Can you let me know once it is merged into main TVH repo?

The fix was merged into master. Let us know if you encounter any issues.