When trying to play using VLC, it can not be played, report that it is using the IV41 codec which is not supported. This is part of the Indeo codec which is 5-6 years old. The Indeo codec contains several security vulnerabilities and one shouldn't play Indeo videos from untrusted sources. On fully patched systems the Indeo codec is disabled in most circumstances; there are no plans to fix the vulnerabilities.
However it will play normally using SMPlayer, which also plays .flv with sound when VLC sometimes fails.
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