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dst_avio_ctx->write_flag = 1;
ofmt_ctx->flags = AVFMT_FLAG_CUSTOM_IO;
ofmt_ctx->pb = m_dst_avio_ctx;
dst_avio_ctx = avio_alloc_context(m_write_dst_buf, IO_BUFFER_SIZE, 0, (void*)this, NULL, cb_write_dst_data, NULL);