Add wrapper for faad2

[Aleksoid1978]

Currently there are problems with decoding some AAC LATM stream, especially multi-channel. While decoding we have many error such "ChannelElement x.x missing"

Maybe add wrapper for library faad2 to allow use it for decoding aac/aac_latm streams.

[Carl Eugen Hoyos]

Replying to Aleksoid1978:

Currently there are problems with decoding some AAC LATM stream, especially multi-channel. While decoding we have many error such "ChannelElement x.x missing"

Which ticket are you thinking of?

Maybe add wrapper for library faad2 to allow use it for decoding aac/aac_latm streams.

This is very unlikely given that we removed the wrapper some time ago (and it would not help for latm given that we chose a different infrastructure for latm than vlc).

[Aleksoid1978]

There are many tickets. One of this - ​https://trac.ffmpeg.org/ticket/4544

Also - i have some samples with AAC LATM(mpeg-ts format), that give the same error.

[Carl Eugen Hoyos]

Replying to Aleksoid1978:

There are many tickets. One of this - ​https://trac.ffmpeg.org/ticket/4544

Is there really another ticket?

Also - i have some samples with AAC LATM(mpeg-ts format), that give the same error.

Please provide such samples.

And please remember that the faad wrapper - that will hopefully not be added - would not fix your issue: faad in FFmpeg would not be able to decode latm (latm was implemented differently in vlc, the faad wrapper can be used for latm in vlc).

[Aleksoid1978]

Here another samples:
​https://yadi.sk/i/cBPlLgqgguszf
​https://yadi.sk/i/DlLlZ6_1guuho
​https://yadi.sk/i/9gFnA5bpguui6
broken playback only 5.1 aac latm streams, stereo - fine.

[Aleksoid1978]

Also - currently broken decode some aac streams. While decode see error like "channel element x.x is not allocated"

sample:
​https://yadi.sk/i/X7wxjqufgutre
​https://yadi.sk/i/GAFBFvXwgutsH

[Aleksoid1978]

All this sample(aac/aac_latm) play fine in latest VLC

[Aleksoid1978]

Any new information ??

[Carl Eugen Hoyos]

As said, it is very unlikely that a faad2 wrapper will be added, and if it were, it would not fix your issues with latm.

[Aleksoid1978]

So - what about aac error, what's wrong with aac sample ??

[Carl Eugen Hoyos]

aac_broken.mp4

This is ticket #1614.

aac_not_detected.ts

This is the sample from ticket #3408.

clip1_audiox3_(aac5.1_aac2.0_eac3).mts
clip2_audiox2_(aac5.1_aac2.0).mts
globo hd 20120424 champions league paulonline.ts

This looks like ticket #4544. All three files play fine with vlc --codec ffmpeg here, indicating a parser issue iiuc.