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png: set AVFrame flags/fields before calling setup_finished().
Fixes tsan warnings in fate-apng: WARNING: ThreadSanitizer: data race (pid=51230) Read of size 4 at 0x7d50000042fc by main thread (mutexes: write M1000): #0 frame_copy_props frame.c:302 (ffmpeg:x86_64+0x1019a35d6) [..] Previous write of size 4 at 0x7d50000042fc by thread T1 (mutexes: write M997): #0 decode_idat_chunk pngdec.c:708 (ffmpeg:x86_64+0x100f5562a)
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@ -701,12 +701,12 @@ static int decode_idat_chunk(AVCodecContext *avctx, PNGDecContext *s,
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if ((ret = ff_thread_get_buffer(avctx, &s->previous_picture, AV_GET_BUFFER_FLAG_REF)) < 0)
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return ret;
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}
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ff_thread_finish_setup(avctx);
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p->pict_type = AV_PICTURE_TYPE_I;
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p->key_frame = 1;
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p->interlaced_frame = !!s->interlace_type;
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ff_thread_finish_setup(avctx);
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/* compute the compressed row size */
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if (!s->interlace_type) {
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s->crow_size = s->row_size + 1;
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