https://bugzilla.wikimedia.org/show_bug.cgi?id=71391

            Bug ID: 71391
           Summary: Wrong options for H264
           Product: MediaWiki extensions
           Version: REL1_23 branch
          Hardware: All
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Unprioritized
         Component: TimedMediaHandler
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected],
                    [email protected], [email protected],
                    [email protected], [email protected],
                    [email protected]
       Web browser: ---
   Mobile Platform: ---

When transcoding video to MP4 with avconv (packages libav-tools и
libavcodec-extra-54), transcoding job fails with:

[NULL @ 0x230a700] [Eval @ 0x7fffaa9238e0] Undefined constant or missing '(' in
'wpred'
[NULL @ 0x230a700] Unable to parse option value "wpred-dct8x8"
[NULL @ 0x230a700] Error setting option flags2 to value -wpred-dct8x8.

Removing "-flags2 -wpred-dct8x8 -level 13" from line 414 of
WebVideoTranscode/WebVideoTranscodeJob.php and "-flags2 -wpred-dct8x8 -level
30" from line 418 fixes it.

If these options are necessary in some configurations and cannot be therefore
unconditionally removed from function ffmpegAddH264VideoOptions( $options,
$pass ), perhaps they should be made configurable from LocalSettings.php.

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