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[Petersampsonaudacity <1076928@xxxxxxxxxxxxxxxxxx>]

Steve wrote in email to me as we discussed this:

>It's been a long time since I attempted to build against the libav project, 
>but I've never managed to get this to work, even when carefully following 
>our documentation and using the versions stated.
>
>I have always disagreed with Gale's assertion that users should manually build
>and install an obsolete version of FFmpeg in order to use FFmpeg with Audacity.
>If Audacity is to remain a mainstream application on Linux, it must work 
>against system library versions that are commonly found in current versions of
>Linux. For common libraries, distribution maintainers will attempt to build 
>Audacity against system libraries. If Audacity does not work when built that 
>way, it will be dropped from their repository, and Audacity will no longer be 
>a mainstream application for Linux, and would essentially become 
>Windows / Mac only.
>
>Currently, Audacity builds against the system version of FFmpeg on Ubuntu 16.04.
>The last time I checked, it also worked with Ubuntu 18.04, so both of the 
>current "LTS" versions of Ubuntu appear to be covered for now.

I agree with Steve's assertion:  
>I have always disagreed with Gale's assertion that users should manually build
>and install an obsolete version of FFmpeg in order to use FFmpeg with Audacity.

Accordingly I shall close this as not a bug

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https://bugs.launchpad.net/bugs/1076928

Title:
  FTBFS with libav9

Status in Audacity:
  Unknown
Status in audacity package in Ubuntu:
  Fix Released
Status in audacity source package in Trusty:
  Fix Released
Status in audacity package in Debian:
  Fix Released
Status in audacity package in Gentoo Linux:
  Won't Fix

Bug description:
  Imported from Debian bug http://bugs.debian.org/692809:

  Audacity currently FTBFS with libav 9:

  [Impact]
  Without libav support, you cannot import/export various audio file types (.ac3, .wma, .m4a, .opus, ...). Previous Ubuntu releases had libav support enabled.

  [Testcase]
  1) Create an .ac3 and/or .wma audio file.
  2) Open Audacity
  3) Select File -> Open -> Open the .ac3/.wma file.

  Audacity should open the .ac3 and .wma file instead of showing an
  error that Audacity does not support this file type.

  [Regression Potential]
  The patch re-introduces libav support again. Major changes in the FFmpeg module were needed to support libav 9 and newer. There could be (new) bugs in the libav import/export due to these changes. Because no other files were touched, there shouldn't be regressions in other parts of the program.

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