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avformat/aviobuf: Only downscale the buffer once it has been used
The code mistook the first iteration sometimes as the end Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@@ -542,7 +542,7 @@ static void fill_buffer(AVIOContext *s)
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/* make buffer smaller in case it ended up large after probing */
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if (s->read_packet && s->orig_buffer_size && s->buffer_size > s->orig_buffer_size) {
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if (dst == s->buffer) {
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if (dst == s->buffer && s->buf_ptr != dst) {
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int ret = ffio_set_buf_size(s, s->orig_buffer_size);
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if (ret < 0)
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av_log(s, AV_LOG_WARNING, "Failed to decrease buffer size\n");
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