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lavc/mjpegdec: Do not skip reading quantization tables.
They may contain 0xFFs, confusing the start code finding algorithm. Fixes ticket #5819. (cherry picked from commit cef5bc0e6e2320d3903cf063d59cef83e91dbc3c) Conflicts: libavcodec/mjpegdec.c
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@ -2104,6 +2104,9 @@ int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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/* Comment */
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else if (start_code == COM)
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mjpeg_decode_com(s);
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else if (start_code == DQT) {
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ff_mjpeg_decode_dqt(s);
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}
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ret = -1;
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@ -2135,9 +2138,6 @@ int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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s->restart_count = 0;
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/* nothing to do on SOI */
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break;
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case DQT:
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ff_mjpeg_decode_dqt(s);
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break;
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case DHT:
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if ((ret = ff_mjpeg_decode_dht(s)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
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