Re: [FFmpeg-trac] #4861(avcodec:open): E-AC3 audio glitch : exponent out-of-range

[FFmpeg]

#4861: E-AC3 audio glitch : exponent out-of-range
+---
 Reporter:  Guillaume   |Owner:
 Type:  defect  |   Status:  open
 Priority:  normal  |Component:  avcodec
  Version:  git-master  |   Resolution:
 Keywords:  eac3|   Blocked By:
 Blocking:  |  Reproduced by developer:  1
Analyzed by developer:  0   |
+---

Comment (by Poloche9x7):

 Same issue with my records since audio are in E-AC3 format. I have many
 audio glitch in my TS files if i play it with VLC, Audacity, etc... , but
 if i play these in my hardware players (Samsung TV, HPLC windows 10, or
 with paid logiciel as CyberLink power DVD, etc), the files work fine !

 Thankx to fix this bug if possible.

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Re: [FFmpeg-trac] #4861(avcodec:open): E-AC3 audio glitch : exponent out-of-range

[FFmpeg]

#4861: E-AC3 audio glitch : exponent out-of-range
+---
 Reporter:  Guillaume   |Owner:
 Type:  defect  |   Status:  open
 Priority:  normal  |Component:  avcodec
  Version:  git-master  |   Resolution:
 Keywords:  eac3|   Blocked By:
 Blocking:  |  Reproduced by developer:  1
Analyzed by developer:  0   |
+---

Comment (by oxhak):

 Hi,

 I'm on ArchLinux, and I have this issue with VLC, Kaffeine, on my DVB-T
 tunner.

 Same like this guy http://www.dvbviewer.tv/forum/topic/58061-unusual-
 audio-issue-on-dvb-t-france/

 He uploaded a file with the glitche here :
 
https://onedrive.live.com/redir?resid=801E6E4E512A1A8F!581990=!AJ4s8d9JG4w97KQ=video%2Cts

 The audio glitch occurs near the end about 00:01:14 (there is only one
 audio stream)

 This bug is really annoying when watching tv on my pc.

 Do you think you can resolve it, cause I tried ffmpeg-git and it's the
 same, issue still here.

 Tell me if you need some sample from my dvb-t tuner for analyze ?

 Regards.

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Re: [FFmpeg-trac] #4861(avcodec:open): E-AC3 audio glitch : exponent out-of-range

[FFmpeg]

#4861: E-AC3 audio glitch : exponent out-of-range
+---
 Reporter:  Guillaume   |Owner:
 Type:  defect  |   Status:  open
 Priority:  normal  |Component:  avcodec
  Version:  git-master  |   Resolution:
 Keywords:  eac3|   Blocked By:
 Blocking:  |  Reproduced by developer:  1
Analyzed by developer:  0   |
+---

Comment (by oxhak):

 Hi,

 I'm on ArchLinux, and I have this issue with VLC, Kaffeine, on my DVB-T
 tunner.

 Same like this guy http://www.dvbviewer.tv/forum/topic/58061-unusual-
 audio-issue-on-dvb-t-france/

 He uploaded a file with the glitche here :
 
https://onedrive.live.com/redir?resid=801E6E4E512A1A8F!581990=!AJ4s8d9JG4w97KQ=video%2Cts

 The audio glitch occurs near the end about 00:01:16 (there is only one
 audio stream)

 This bug is really annoying when watching tv on my pc.

 Do you think you can resolve it, cause I tried ffmpeg-git and it's the
 same, issue still here.

 Tell me if you need some sample from my dvb-t tuner for analyze ?

 Regards.

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Re: [FFmpeg-trac] #4861(avcodec:open): E-AC3 audio glitch : exponent out-of-range

[FFmpeg]

#4861: E-AC3 audio glitch : exponent out-of-range
+---
 Reporter:  Guillaume   |Owner:
 Type:  defect  |   Status:  open
 Priority:  normal  |Component:  avcodec
  Version:  git-master  |   Resolution:
 Keywords:  eac3|   Blocked By:
 Blocking:  |  Reproduced by developer:  1
Analyzed by developer:  0   |
+---

Comment (by tesla_):

 Hi some news. I've try to make a statistic approch of the problem.
 I've analyse the amount begin header of each frame and each block , the
 amount of consumption of data for each block and frame for 20/30
 consequently and like i think it's very linear. With this approach i
 sucessfull find the function that sucks and doesn't consumme enough data.
 The data pointer is completely shifted for the seconde blk of the frame
 and  the error is detect only when it's possible to detect.. AKA in
 decode_exponents and with a very lucky way...
 Now next step why decode_transform_coeffs doesn't consumme the data she
 could :)

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Re: [FFmpeg-trac] #4861(avcodec:open): E-AC3 audio glitch : exponent out-of-range

[FFmpeg]

#4861: E-AC3 audio glitch : exponent out-of-range
+---
 Reporter:  Guillaume   |Owner:
 Type:  defect  |   Status:  open
 Priority:  normal  |Component:  avcodec
  Version:  git-master  |   Resolution:
 Keywords:  eac3|   Blocked By:
 Blocking:  |  Reproduced by developer:  1
Analyzed by developer:  0   |
+---

Comment (by tesla_):

 I've manually detect the frame that sucks. (Three )
 The last is the 1298 frame
 I've manually apply a gain of zero when apply scaling to coefficients. and
 the artefact disappears :)
 Now must found write a good solution to apply to each time :)

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Re: [FFmpeg-trac] #4861(avcodec:open): E-AC3 audio glitch : exponent out-of-range

[FFmpeg]

#4861: E-AC3 audio glitch : exponent out-of-range
+---
 Reporter:  Guillaume   |Owner:
 Type:  defect  |   Status:  open
 Priority:  normal  |Component:  avcodec
  Version:  git-master  |   Resolution:
 Keywords:  eac3|   Blocked By:
 Blocking:  |  Reproduced by developer:  1
Analyzed by developer:  0   |
+---

Comment (by michael):

 Replying to [comment:13 tesla_]:
 > official doc atsc

 debuging this from the doc is timeconsuming and assumes this is not a typo
 in the doc (which we cannot exclude really as a explanation at this point)

 Is there some reference implementation that is open source ?

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Re: [FFmpeg-trac] #4861(avcodec:open): E-AC3 audio glitch : exponent out-of-range

[FFmpeg]

#4861: E-AC3 audio glitch : exponent out-of-range
+---
 Reporter:  Guillaume   |Owner:
 Type:  defect  |   Status:  open
 Priority:  normal  |Component:  avcodec
  Version:  git-master  |   Resolution:
 Keywords:  eac3|   Blocked By:
 Blocking:  |  Reproduced by developer:  1
Analyzed by developer:  0   |
+---

Comment (by tesla_):

 official doc atsc

 Ive audit the decode_components function and it's same that the doc ...
 Somme missing param in the eac3 parser but not affected by the file ac3
 attached here ...

 http://atsc.org/wp-content/uploads/2016/03/a_52-2015.pdf

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Re: [FFmpeg-trac] #4861(avcodec:open): E-AC3 audio glitch : exponent out-of-range

[FFmpeg]

#4861: E-AC3 audio glitch : exponent out-of-range
+---
 Reporter:  Guillaume   |Owner:
 Type:  defect  |   Status:  open
 Priority:  normal  |Component:  avcodec
  Version:  git-master  |   Resolution:
 Keywords:  eac3|   Blocked By:
 Blocking:  |  Reproduced by developer:  1
Analyzed by developer:  0   |
+---

Comment (by michael):

 Is there a open source reference decoder for EAC3 ?

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Re: [FFmpeg-trac] #4861(avcodec:open): E-AC3 audio glitch : exponent out-of-range

[FFmpeg]

#4861: E-AC3 audio glitch : exponent out-of-range
+---
 Reporter:  Guillaume   |Owner:
 Type:  defect  |   Status:  open
 Priority:  normal  |Component:  avcodec
  Version:  git-master  |   Resolution:
 Keywords:  eac3|   Blocked By:
 Blocking:  |  Reproduced by developer:  1
Analyzed by developer:  0   |
+---
Changes (by cehoyos):

 * priority:  important => normal


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Re: [FFmpeg-trac] #4861(avcodec:open): E-AC3 audio glitch : exponent out-of-range

[FFmpeg]

#4861: E-AC3 audio glitch : exponent out-of-range
+---
 Reporter:  Guillaume   |Owner:
 Type:  defect  |   Status:  open
 Priority:  important   |Component:  avcodec
  Version:  git-master  |   Resolution:
 Keywords:  eac3|   Blocked By:
 Blocking:  |  Reproduced by developer:  1
Analyzed by developer:  0   |
+---
Changes (by tesla_):

 * priority:  normal => important


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Re: [FFmpeg-trac] #4861(avcodec:open): E-AC3 audio glitch : exponent out-of-range

[FFmpeg]

#4861: E-AC3 audio glitch : exponent out-of-range
+---
 Reporter:  Guillaume   |Owner:
 Type:  defect  |   Status:  open
 Priority:  normal  |Component:  avcodec
  Version:  git-master  |   Resolution:
 Keywords:  eac3|   Blocked By:
 Blocking:  |  Reproduced by developer:  1
Analyzed by developer:  0   |
+---

Comment (by tesla_):

 Same for me on french DVB channel with eac3.
 Lots of glitch all time. I've spend lot's of hours with the official doc
 atsc.org with no success.
 The sound attache here play very well and convert with no glitch on a mac
 (with afconvert)
 When open the sound with audacity on linux we can see the 3 glitches.
 On Mac with audacity ( he use the internal audio library) no artefact.
 The file is not corrupt (no crc error ...)
 Can anybody help us on this bug ?

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Re: [FFmpeg-trac] #4861(avcodec:open): E-AC3 audio glitch : exponent out-of-range

[FFmpeg]

#4861: E-AC3 audio glitch : exponent out-of-range
+---
 Reporter:  Guillaume   |Owner:
 Type:  defect  |   Status:  open
 Priority:  normal  |Component:  avcodec
  Version:  git-master  |   Resolution:
 Keywords:  eac3|   Blocked By:
 Blocking:  |  Reproduced by developer:  1
Analyzed by developer:  0   |
+---

Comment (by Eiffel):

 This bug is very annoying and occurs more often in speech than music. On a
 talkshow, this can be several times per minute.
 I observe it on each DVB-T recording and occasionally in other sources.

 Conversion with ffmpeg shows an "exponent out-of-range" error for each
 glitch.
 However, some errors reported are not audible.

 The same DVB-T sample reads fine for me on two hardware players and with
 MPC-HC v1.3.1249.0 on a very old PC that received tons of codecs and
 upgrades. On the same PC, the glitches occur with VideoLAN player.

 On a new PC, I cannot read this sample with whatever I test. Probably
 because most plyers use ffmpeg...

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Re: [FFmpeg-trac] #4861(avcodec:open): E-AC3 audio glitch : exponent out-of-range

[FFmpeg]

#4861: E-AC3 audio glitch : exponent out-of-range
+---
 Reporter:  Guillaume   |Owner:
 Type:  defect  |   Status:  open
 Priority:  normal  |Component:  avcodec
  Version:  git-master  |   Resolution:
 Keywords:  eac3|   Blocked By:
 Blocking:  |  Reproduced by developer:  1
Analyzed by developer:  0   |
+---
Changes (by sdrik):

 * cc: cschieli@… (added)


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Re: [FFmpeg-trac] #4861(avcodec:open): E-AC3 audio glitch : exponent out-of-range

[FFmpeg]

#4861: E-AC3 audio glitch : exponent out-of-range
+---
 Reporter:  Guillaume   |Owner:
 Type:  defect  |   Status:  open
 Priority:  normal  |Component:  avcodec
  Version:  git-master  |   Resolution:
 Keywords:  eac3|   Blocked By:
 Blocking:  |  Reproduced by developer:  1
Analyzed by developer:  0   |
+---

Comment (by heleppkes):

 The Microsoft decoder also plays this without any glitches.

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Re: [FFmpeg-trac] #4861(avcodec:open): E-AC3 audio glitch : exponent out-of-range

[FFmpeg]

#4861: E-AC3 audio glitch : exponent out-of-range
+---
 Reporter:  Guillaume   |Owner:
 Type:  defect  |   Status:  open
 Priority:  normal  |Component:  avcodec
  Version:  git-master  |   Resolution:
 Keywords:  eac3|   Blocked By:
 Blocking:  |  Reproduced by developer:  1
Analyzed by developer:  0   |
+---
Changes (by titer):

 * cc: eric@… (added)


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Re: [FFmpeg-trac] #4861(avcodec:open): E-AC3 audio glitch : exponent out-of-range (was: AC3 audio glitch : exponent out-of-range)

[FFmpeg]

#4861: E-AC3 audio glitch : exponent out-of-range
+---
 Reporter:  Guillaume   |Owner:
 Type:  defect  |   Status:  open
 Priority:  normal  |Component:  avcodec
  Version:  git-master  |   Resolution:
 Keywords:  eac3|   Blocked By:
 Blocking:  |  Reproduced by developer:  1
Analyzed by developer:  0   |
+---
Changes (by cehoyos):

 * keywords:  AC3 => eac3


Comment:

 No audible glitches with my hardware decoder.

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