[Bug 749428] New: theoraenc: memory errors reported by valgrind

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=749428

            Bug ID: 749428
           Summary: theoraenc: memory errors reported by valgrind
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: gdesmott at gnome.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Validate transcode scenarios such as
validate.file.transcode.to_vorbis_and_theora_in_ogg.mp3_h264_0_mp4 raise this
kind of errors when run inside valgrind:

==25715== Use of uninitialised value of size 8
==25715==    at 0x3ECCA09F1D: UnknownInlinedFun (analyze.c:1047)
==25715==    by 0x3ECCA09F1D: oc_analyze_mb_mode_chroma.isra.1 (analyze.c:1458)
==25715==    by 0x3ECCA0ADD0: oc_cost_intra.isra.2 (analyze.c:1640)
==25715==    by 0x3ECCA113FF: oc_enc_analyze_inter (analyze.c:1958)
==25715==    by 0x3ECCA1E326: oc_enc_compress_frame (encode.c:1180)
==25715==    by 0x3ECCA1E326: th_encode_ycbcr_in (encode.c:1553)
==25715==    by 0x102FA2CE: theora_enc_handle_frame (gsttheoraenc.c:989)
==25715==    by 0x55705E6: gst_video_encoder_chain (gstvideoencoder.c:1380)


==25715== Conditional jump or move depends on uninitialised value(s)
==25715==    at 0x3ECCA0A097: oc_analyze_mb_mode_chroma.isra.1 (analyze.c:1466)
==25715==    by 0x3ECCA0ADD0: oc_cost_intra.isra.2 (analyze.c:1640)
==25715==    by 0x3ECCA113FF: oc_enc_analyze_inter (analyze.c:1958)
==25715==    by 0x3ECCA1E326: oc_enc_compress_frame (encode.c:1180)
==25715==    by 0x3ECCA1E326: th_encode_ycbcr_in (encode.c:1553)
==25715==    by 0x102FA2CE: theora_enc_handle_frame (gsttheoraenc.c:989)

Those could be false positives, bugs in libtheora or in gst (if the encoder
expect a specific size of buffer or something like that).

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